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What You Need To Know About Mercury Optimax's! | Troubleshooting

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There are a couple of basic tests and procedures that a lot of people skip over when trying to troubleshoot a Mercury Optimax. Here is a short video that goes over the basics which should get you pointed in the right direction.
Starting with splitting the chaps to make life so much easier, then doing a spark and compression test. Optimax's are known for failing coils. So a spark test will show you if this is one of the problems.
*** IMPORTANT!!!!!*****
CERTAIN OLDER OPTIMAX'S HAVE COILS THAT CAN SHORT OUT EXPENSIVE ELECTRONIC PARTS! MAKE SURE YOU KNOW WHAT OPTIMAX YOU ARE WORKING ON BEFORE SWAPPING AROUND PARTS WITH ANOTHER ENGINE!
Checking the air and fuel pressure on an Optimax next is super important to properly diagnose the issue. If the air pressure is not where it should be the fuel pressure will not build either.
Sometimes people can chase fuel pressure without even fixing the air pressure and waste many hours fixing something that wasn't broken.
Most Opti's require 90 PSI fuel and 80 PSI air. If these pressures are off, then start with the air pressure and check the compressor by clamping off the air dump hose on the PORT fuel rail. The pressure should spike, then check the fuel as well.
These tests can get you up and running way faster than anything else. Usually, a spark plug, ignition coil, or some dirty fuel filters are what the problem is with an Optimax!
***Disclaimer*** This video is just a visual aid for locations and parts of a normal service.
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This video is just a visual aid for locations and parts of a normal service.
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Опубликовано:

25 авг 2024

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Комментарии : 457

@BornAgainBoating 4 года назад

Suggest Topics That You Would Like For Us To Cover On Technician's Tuesday! www.bornagainboating.com/technicians-tuesday/

@alibornot6082 4 года назад

Born Again Boating I have a Mercury 115 saltwater that is leaking water from the top of the midsection any advice what could it be?

@walterhampton5955 Год назад

My 2010 150 optimax keeps stopping at idle

@peteabdu9179 11 месяцев назад

taking apart a VST in an optimax

@jmatak9 8 месяцев назад

This video might be 5 years old but has to be the best video I've found on trouble shooting a Optimax with clear instructions and explanation. Thank you for posting!

@BornAgainBoating 7 месяцев назад

Thank you!

@TheAxeman2112 4 года назад

Thank you so much for doing this video. I am auto mechanic trying to help a friend out with his Optimax 200 and its helped me in a very short time to see and understand how the fuel system works. I am looking at what looks like two injectors and compressed air to the fuel rails. So as a auto mechanic I needed to find out the scoop. You covered exactly what I needed to make the correct diagnosis.

@BornAgainBoating 4 года назад

Glad it was helpful!

@claireaddison3589 5 лет назад

Great information and all true...unlike most of the crap that's on you tube about outboards. Nice to listen to someone who knows what he's talking about. Keep up the good work.

@BornAgainBoating 5 лет назад

Thank you!

@larryleblanc1551 3 года назад

@@BornAgainBoating Hello. I believe I made a request. I like your info. Good voice. Precise. I loved it. Maybe a bit swift but great info. Thank you.

@anthonyscocca7205 3 года назад

The best diagnostic overview for optimax on the net. Thank you

@andynavarro5543 5 лет назад

Best video ever! I hate optimax for a lot of reasons but your video is awesome and definitely helpful. Thanks for posting

@BornAgainBoating 5 лет назад

Your welcome :) thank you! I hope it helps a lot of people at least get pointed in the right direction. Boating is more fun on the water than at the dock ;)

@hankjivecrankmaster207 4 года назад

Responding to comment by Edward: BAB, I find that when videoing, it helps to "pan" to the detail, then purposely hesitate on the detail item you are showing. I think the pace of your videos is good, quick and succinct, I just replay segments if need. Also there's a speed feature (in settings) in the bottom right of vid toolbar where one can slow down or speed up the video, very handy. When looking for a reference vid, I usually hit the "under 9 minute" vid first, then look for longer ones if needed, seldom would I click on a 22 minute vid to start with. Cheers, and thank you for these vids!

@darylreadman3596 2 года назад

Wow you can tell you do this for a living. Just info packed videos condensed down to alot of the issues with an Optimax. Thanks!

@bflavasonthetrack 2 года назад

Excellent. I’m in the process of buying a 22’ triton with this motor on it. We did the compression test today. Left to right top to bottom 80,75,80,77,80,75

@bflavasonthetrack 2 года назад

@bornagainboating but how are those compression test results?

@Sailor6666 5 лет назад

Thank you so much. Im a rather new Optimaxuser and this video is just superb for a rational troubleshooting... Im actually having the same low pressure result that Luis Monzon stated here below (70-80 on a 200 Hp, Year 2002, 350 hours ). But the engine doesn't show any other symptoms to be inaccurate - it runs pretty great in all rpm-ranges. But I'm following your conversation with great interest... Thank you once again.

@BornAgainBoating 5 лет назад

Awesome! Thank you for commenting! :)

@paulbickley658 Год назад

Good video, I thought the description of the process of troubleshooting was said quite fast and hard to comprehend anything even though I have mechanical background. I suggest anyone else including myself would have to listen to this at least a dozen times. I have a black optimax on my Ranger Boat. I am just learning mine.

@brettmurphy4658 Год назад

Try turning the playback speed down to .75.

@stevepritchard9544 4 года назад

Great Blitz around the pieces quickly, much appreciated.

@melcowan2117 2 года назад

My OptiMax 150 was running fine then suddenly went down to 1300 rpm and won’t exceed that despite moving the throttle forward. Got it checked and it wasn’t overheating.

@Hubjeep 4 года назад

2:18 Thank you for explaining the second injector... I'm considering going from my 1994 Merc 2.5 (carb) boat to a 2012(?) Optimax boat. I'm a DIY (I maintain everything I have)... this Opti looks a bit scary to me. I have heard about compressor failure destroying an engine, but I also heard coils are $400 a piece, just searched and found aftermarket ones for $60.

@colbybud 2 года назад

never ever put an aftermarket injector on an outboard. The pintle can come loose and take out the cylinder. they are essential for engine health that each injector fires the same amount of fuel. This is why you have them cleaned every 300 hours. Pull all 12 injectors and send them off for cleaning. You can buy used injectors for about $250 each there is a company that sells them.

@mikebryant9462 3 месяца назад

I have a 2009 225 optimax and never has given me a problem and I haven’t cranked it in 5 months and tried to start it and it wouldn’t fire. I went and took the cowling off and fuel line was loose and leaking. Fixed that and still just spins. Help appreciated , like your channel!

@Rapbando 3 года назад

You should have mention the reed valve pack because I've found one engine that was running at idle but couldn't ramp up because of all the screwes holding the plate of the valves dropped down in the air manifold I could see them just looking through the butterfly valve

@nobody46820 5 лет назад

Good grief! Looks like Mercury did a great job of over-complicating an engine! Just out of curiosity, can a shade tree mechanic do anything to service/repair/clean the air compressor or fuel injectors? Great video!

@BornAgainBoating 5 лет назад

Ahhhh they aren't that bad :) Sure, just run some quickleen occasionally when you fill up the fuel tank! That should keep the injectors pretty clean! Also, stay away from ethanol fuel and stick to the REC-90, that helps too!

@nobody46820 5 лет назад

@@BornAgainBoating Roger,Roger. What about when traveling internationally?

@dombix2286 2 года назад

Hello, I have a 2008 150 optimax, i bought it with compersor that blew apart, i bought the new compresor but i suppose the old one didnt blow apart for no reason, to be exact im suspecting my oil pump on the engine is not working properly, i tried it outside and it is working, it is pumping out oul every time i connect it and dissconect it to the battery, also when i turn on the priming process with the accelerator, it starts pumping nicely, but when the engine is running when i dissconect the output hoses there is no oil coming out, my outboard oil reservior is holding the pressure, it has a few litters of oil in it and the hoses seem good, i heard the on-engine oil tank caps can go bad but im not sure that is the reason that oil pump is not working right as it pumps oil when engine is not running(during the priming process). So my question is how much oil the pump should provide when engine is running and is it maybe possible my engine computer is for whatever reason not sending the right signals to the oil pump while engine is working ? It would be really helpfull if you know something on that topic, thanks in advance.

@nicholasbeldock9904 Год назад

I have a 2012 200 optimax pro XS, I have changed plugs, fuel filter and it will idle fine and run great for the first 5 or 10 mins then will bog down and won’t go above 4,000 rpms without bogging, I don’t know what it could be ?

@roko7661 29 дней назад

Pretty cool explanation! I have one question. Optimax 225, on the max throttle boat shoots like an arrow, but runs for maybe 30-40 seconds and then starts to cut.... And if I lower the throttle, then can continue to go, maybe 4000 RPM, then nail again throttle and agains runs on wide open for maybe 5-10 seconds and again start to cut. To my eye seems like that simply don't have enough fuel to run on the max throttle. Sparkplug are brand new and engine is actually really explosive but for like 1 minute and then start to cut, going intermittent, I lower down a bit throttle and continue to go on less power well, smoothly and without interruption. Low pressure fuel pump maybe? Thank you!

@BornAgainBoating 12 дней назад

Could be a ton of different things, but most likely fuel related, where you are running out of fuel volume, could be in the tank, the lines from the fuel tank, the water sep, the low pressure pump, the filter on the high pressure pump. You'll need to do some testing for sure, here are some videos: ru-vid.com/video/%D0%B2%D0%B8%D0%B4%D0%B5%D0%BE-09ob37BC02Y.html ru-vid.com/video/%D0%B2%D0%B8%D0%B4%D0%B5%D0%BE-g7eIUx5bP_k.html ru-vid.com/video/%D0%B2%D0%B8%D0%B4%D0%B5%D0%BE-IcvkP8pRsRY.html&t Also, could be the high pressure pump could be dirty or something like that, dirty filter on the pump, etc.: ru-vid.com/video/%D0%B2%D0%B8%D0%B4%D0%B5%D0%BE-Qtz-9_-_dTk.html That will be a similar video, hopefully that helps and you get it figured out! If not, we could help out a little more in the Boater's Program where you can message and upload pictures and videos, you can check that out here: www.bornagainboating.com/ But hopefully you get it figured out ;)

@michaelbaker1506 2 года назад

I have a 2005 with a alarm going off at 4100 rpm and at 4200 hits Rev limiter

@MohdAbbas123 2 года назад

Thank you, very useful informations, I have mercury Optimax 225 m. 2008, I got problem with the fuel pump fuse, the fuse get burned, what could be the issue to fix..

@martinfromseacity2010 2 месяца назад

Thanks good one

@dappelgren3062 2 года назад

2006 115 Optimax. Goes into guardian mode and throws 8 different random codes in no particular order. I can clear the codes with vessle view app but boat will beep and not go over 10mph. 2091-23 guardian due to overspeed. 541-24 water temp. 701-24 oil tank A level. 711-24 oil level. 451-25 pitot pressure. 555-24 Air comp temp. 2092-23 neutral overspeed. 1012-25 trim pos.---Water pump replaced and flowing great. Only has one oil tank on top of engine always full and currently oil sensor is bypassed. Swapped out water temp guage. New spark plugs. Oil pump pressure confirmed. Starts and idles great but will not rev up much higher than 3000 rpm without faulting out.

@stevagaga Год назад

Hi, I have almost the same issue. Did you fix your motor and how?

@22steny 4 года назад

Wow this was awesome! I have a 135 Optimax and just had it in water this weekend for first time of the year. It started showing overheating but was pushing water out that wasn't hot. Any suggestions would help Great video. Also is there any yearly maintenance you recommend on this engine? Fuel filter water filter when should one change them?

@BornAgainBoating 4 года назад

Thank you! Make sure the temp sensors are working properly :) sounds like one has failed and is telling the engine it's getting hot. But also make sure it's not the compressor, it's best to put it on a computer and see the exact code and what's going on. Yeah, just your normal service, fuel filters, impellers, thermostats, the normal stuff. Do the fuel filters once a year if you don't use the boat that often, here's some more info on service: ru-vid.com/video/%D0%B2%D0%B8%D0%B4%D0%B5%D0%BE-_l5mwbHzHBY.html&t

@taniatait1791 3 года назад

Definitely put me off buying an optimax thinking honda now

@Breckenbeil26 6 месяцев назад

specific question: can I get details about what repairs you made to that 225 optimax in the video years ago? i am 99.9% sure I literally now own that exact boat (proline with #14), and have been having engine issues since I bought it 10 months ago. recently this past week, the engine turned off when slowing down to neutral a few times, and then while in neutral, started revving on its own. when running, it had no issues. My buddy suggested I look into the Throttle Position Sensor, and somehow this was the first video that popped up, and Ironically, I was like, that is my boat. lol. Thanks!

@BornAgainBoating 6 месяцев назад

That's a tall order lol ummmmmmm 6 years ago, I think that was all fuel issues then, filters, spark plugs, a dirty vst, and I think 1 air injector was messed up. You'll have to run the tests and make sure the fuel and air system are all up to snuff first, do what's in the video for sure. Here's another video that has an optimax fuel system over view in it as well: ru-vid.com/video/%D0%B2%D0%B8%D0%B4%D0%B5%D0%BE-g6Bfnii1ivU.html

@captchris7362 2 года назад

Dealing with a 225 pro xs with high fuel pressure at 120 130 psi have no run into this before thinking regulator or trash in the fuel rail any other thing you seen

@abill7228 2 года назад

Why does my 2005 225hp Optimax Saltwater motor make a constant beeping tone when I hit 4400RPM? The engine is still pissing, I changed out the secondary & primary water/fuel separator filters, the gas is clear, and both oil reservoirs are filled.

@paulcane5734 Месяц назад

Hi mate Paul from Australia here, just wondering if you meant that the fuel pressure increases when u block the fuel return hose not the air increase? I’m having low pressure air and fuel issues on my 2008 115hp optimax

@BornAgainBoating Месяц назад

Hello Paul, Well they are directly related because of the tracker valve, they should stay 10 PSI apart, so when you pinch the dump, they spike :) been a while since I messed with an older Opti, can't remember fully. If you don't have air pressure you won't get fuel pressure. Best to just get your fuel pressure to normal, roughly 45ish PSI, letting you know the VST and all that assembly is good. Then look into the air, you have to get the air pressure right before going any further on the fuel side of things. No air pressure, no fuel pressure, or higher fuel pressure where it should be for the injectors to work properly together. Hopefully you can run the tests in the video though and figure out if you have a weak air compressor or a pressure regulator. If you can't get it figured out you could look into joining our Boater's Program where we have messaging and a place for you to upload pictures and videos and we can discusss whatever you want on a weekly livestream. But hopefully you figure it out :) best of luck!

@spesse 4 года назад

Mercury Optimax 150, long rig, year model 2008 Hours: 352h Replace parts New trim cylinder New spreader New Fuel Filter 6 new spark plugs The engine is in very good condition, mechanically and visually Starts and goes, does not go up in laps, good comp in the engine. I am in the dark here!

@BornAgainBoating 4 года назад

There's a lot of variables here :/ what are the fuel and air pressures?

@charlesbarton4121 Год назад

optimax im working on does not have a starboard schrader valve.

@Hamchuck112 3 года назад

Thanks a lot for this video. My new to me 2007 225 Opti went on its first trial today at low RPM. Never had an issue starting, but has never really been under load except for a few short bursts today below I'd say 3500rpms. It shut off 5 seconds after starting up to make the 100yd trip back to the dock. When I turned the key off and then back on, the fuel pump was very noisy and higher pitch when priming. Did this constantly and couldn't get it to run longer than several seconds. Is it most likely the high pressure pump? I haven't checked pressures but I will after seeing this video. The engine is beautiful and looks nearly new with 700hrs on it, but I'm hoping it isn't going to turn into a headache. Thanks again!

@tonchido 2 года назад

I had 200 hp,my god does it burn petrol,loved the sound in neutral.

@richblake6932 3 года назад

Concerning my boat problem I was wondering if it also could be the oil reservoir. There’s plenty of oil coming out in the filter is good

@garymccarty7909 3 года назад

Have a 225 that spits and Sputters when throttling Ford will not get a bond plane usually choke itself down

@SpannFun114 2 года назад

Thanks for posting the video. I have worked through the tests but have a question. I have a 2008 Optimax 225 DFI. Good spark, good compression, good fuel and new filter, good fuel and air pressure. Sounds good out of the water. In the water I throttle up and can’t get passed 1100 rpm with full throttle. Any suggestion on what I could check next? Thanks

@phoenixw2w Год назад

Did you ever figure out issue?

@SpannFun114 Год назад

@@phoenixw2w yep, it was a bad primer bulb. So simple.

@phoenixw2w Год назад

@@SpannFun114 Right on, thanks for the fast response.

@timswearengin9693 4 года назад

My mercury pro xs 250 won't turn but 4800 changed coils and now 5000 rpm sometimes 5100 rpm.

@davidgibson5157 Год назад

2006 mercury optimax 150 revs high is it the tracker valve or air tracker or body said the tsp has a rubber o ring that makes the linkage to sum times to stick ? I took my throttle apart thought cable broke

@scottbellamy1844 5 лет назад

l have done most of the things in the video ,spark plugs ,checked coils cleaned vst check air &fuel ,changed out TPI but my rig runs great above 3500rpm but surges at about 1500.l have new fuel injectors and had air injectors cleaned after putting on a computer. still runs rough but not dying as bad after it warms up. Any ideals the guy who looked at it on the computer said I have a stretched hot foot cable keeping it from proper tpi adjustment. My opti max 225 Pro XS is a 2006 all but 1 cyl.compression110 number 6cyl 100.

@BornAgainBoating 5 лет назад

Hello @scott bellamy I can't think of anything specific that could be causing that type of an issue. Something should have been a miss while doing all of those tests. It's possible that one of the ignition coils is beginning to fail and then at higher RPM's it is getting more juice so it runs fine. It's hard to say for an issue like that, without being able to look at it :( Sorry I don't have any tricks or oh yea it's this, kind of information for you.

@davidhood6818 2 года назад

After sitting in my garage this fall when I could not run it I have a file problem. It will start for a second and then die. Where do I start

@mikefullerton5068 Год назад

My motor was running 50 mph .All of a sudden the motor shut down. It would only idle at that point. I replaced fuel lines , fuel filter, cleaned plugs, they looked fine. Motor still idles fine. Will not get on top of water. 175 hp mercury 2016 model. Thanks

@bhyroolpersaud2707 3 года назад

My 225 year 2000 murcury optimax is idling high I try troubling everything can't find the fault. Help

@larryleblanc1551 3 года назад

Would love to see overetemp, buzzer with loud noise at WOT.

@jamesshort2763 2 года назад

My motor fires up with very high re then dies it does that 2 or 3 times then it starts maybe

@reelcs 2 года назад

Aaron if 12v is applied to VST tank electric fuel pumps they should function correct? 200hp/2002 Mercury Optimax; both pumps high psi and low psi are not functioning. Have you seen that before? Engine been sitting in varnished fuel for a couple years. There is no psi at Schrader valve on fuel rail. Thx!

@abauer9865 3 года назад

thanks for the video and all of the great content, i am learning alot. @2:25 you show and mention pinching off the fuel line and then you say to "watch for the air pressure to spike" but in the video is shows the fuel pressure spike.....was this just a miss speak?

@BornAgainBoating 3 года назад

They will both spike, when air goes up the fuel will go up as well, but this engine had an issue so I think I just used the fuel shot to show a spike

@garye8367 2 года назад

My 200hp murcury 2.5litet black Max won't idle runs fine over 2000 rpm

@rickramberg 3 года назад

I have a Mercury 115 efi 4 stroke. I'm looking for a good video on checking coils. We have a high end mis. We have changed spark plugs twice. Both times the issue seemed to go away. Only to return a short time later. We suspect its one of the coils. We've bought new coils, but would like a good way to diagnose the problem. Specifically at the coil itself.

@TattsByCasper 2 года назад

My 75 mercury optimal starts beeping 6 times after a few minutes of running. I can see the pee hole and water constantly comes out.

@rogeratkinson592 4 месяца назад

Should my Optimax 150 pee immediately, or does it wait until the engine is warm? I have fished a several years, but have never taken a boat out myself. My dad died about a year and a half ago and I now possess his Nitro 7. It has not been on the water in almost two years, and the batteries need to be replace. The cranking battery has totally died and I have tried charging it and reconditioning it. I also decided to replace the trolling motor batteries with Li Time (lithium) batteries, and am going to install a lithium charger, too. But, I already knew that the tell tale wasn't peeing from cranking it up a few months ago. I had tried muffs, but it never peed. I bought a large (soft) rainwater collection "can" and filled it up. That way the propeller can turn with no need for the muffs. Using both methods. it still never peed. I only found out today that I could screw in my hose to the left of the tell-tale. That did cause water to stream from the tell tale. But my main question still remains: Should the tell tale pass water immediately, or should it rely on the engine warming up enough to open up the thermostat?

@leonleong3744 Год назад

Hi morning I'm Leon, may I know how much of de combustion spec on optimax 250?

@richardshal 5 лет назад

Awsom overvue of the optimax fuel system

@BornAgainBoating 5 лет назад

Thank you!

@thesupertruckerdave 4 года назад

Where do I find the spark tester and remote starter switch? Great video

@BornAgainBoating 4 года назад

www.bornagainboating.com/product-category/mechanical-tools/

@Timbuctoo 2 месяца назад

I have a 150 Opti and I want to know where the negative wire from the battery connects to on the outboard?

@TheDoug9901 4 года назад

Some call them optipop by nerds who think they can rev till they pop. I usually run low 5000 at the most never have a problem. Think 5600 is maxed 6000 they will fly apart. Mercruiser 140 was 3500 and 4000 and up to 5000 blew them up.

@maritimeus 2 года назад

I have a 2004 Mercury Optimax 115hp on my 1996 Mako 19’ (just bought the motor with the boat). There is no fuel priming bulb (I checked). Before I do fuel pump or VST maintenance on my optimax, how should I ensure the motor is primed when I reassemble? Because there’s no bulb, should I assume that the optimax fuel pump will self-prime? It must not have been a problem for the previous owners and marine mechanics. Any suggestions or ideas for the procedure? Thanks

@earleclemans4836 2 года назад

What do you know about the optional pitot sensor thats not hooked up ?

@conleydyson8049 Год назад

When under power on the water the motor will not trim up all the way to get the boat on top end plane could this be a power trim solenoid switch ???

@davidjessee7701 4 года назад

2006 175 optimax .. bogs on acceleration.. pull back throttle then hammer down and it takes off and runs one hundred percent...

@BornAgainBoating 4 года назад

Could be many different things, even a tps, but start with the spark test to make sure the coils are firing normally :)

@davidjessee7701 4 года назад

A little worse now..ran fine for a few miles. Then set down at wake zone idled for 10 minutes, then when hit the throttle ,like nothing, had to feather the throttle then it slowly hit plane and then ran up to wot no problem bet Everytime went idle zone we had this same take off issue..once on plain is ran fine.. do you think mabe low pressure fuel pump?

@JayObiegyn72-i3w Месяц назад

2001 mercury optimax 225xl. Jumps from 580 idle to 1180 after an inch of no response. Changed everything up to the tps. Nobody else seems to have this issue?

@BornAgainBoating Месяц назад

I would take the control cables off the engine throttle control and move the throttle control slowly and see if the engine climbs normal, if it does, you've got an issue on the boat side. If it doesn't then the problem is on the engine. And then yes, you gotta look at the TPS and make sure that is all smooth, also check to see if the throttle plate is sticking.

@stevagaga 2 года назад

Thank you for the video, and maybe you can help me with my Optimax. I have one Optimax 115 from 2005, with 3 cylinders. The problem I have is not the motor itself, but the leakage from the top of the oil tank on the motor, when I tilt the motor (when I want to keep the prop out from the water, or when I am transporting the boat). I have changed the gasket, but it is still leaking when the motor is tilted. The oil tank is full, and I do not know what to do. Any suggestion? Thanks again:)

@kennyfok168 2 года назад

Great video, may I ask a quick question, I have optimax 200 , when it start 30 second , It gone warning (STBD system fault 14), I check it have engine oil, what can I do coming time ?

@morgancure1604 2 года назад

what about if youre not getting spark?when i turn key on it chimes to let you know its on.. seems like most outboards do..mine doesn't nor do i hear the fuel pump come on..i have an 06 mercury optimax 90..i pulled the plugs and there's no spark...this motor has less than 100 hours on it although it has sat for 6 years...any sugestions would help

@lorrieandrews5188 4 года назад

Excellent and informative video - cramming a lot of information in a short period of time; thank you. I have a question: I have twin 225's on my boat; starboard idles a bit rough, will not go beyond about 4,600 rpm at wot and burns significantly more fuel than the port engine. Any ideas of the cause?

@BornAgainBoating 4 года назад

Youll just have to start with the tests in tge video. Maybe plugs, a bad coil, an open injector, could be anything :/

@bakervinci163 2 года назад

How do you compression test with key off ?

@bakervinci163 2 года назад

Oh, pressure valves

@all_you_can_anime2842 10 месяцев назад

I have a 2003 Optimax 150HP and it won't stay on idle. I changed all of the spark plugs and fuel filter but it didn't help. Do my motor have an IAC valve and where can I find it if it does have one? The engine start up ok but then the rpm would go down and turn off the motor.

@runnningonempty 2 года назад

I SURE AM GLAD I CAME ACROSS THIS VIDEO BEFORE i PURCHASED ONE OF THESE PIECES OF CHIT..LOOK AT ALL OF THESE COMMENTS...NOT ONE GOOD..WOW!

@AngryLS1 5 лет назад

But I need in-depth info on vst and starting issues lol! Great video thanks.

@BornAgainBoating 5 лет назад

Hahha thank you!

@chuckatkins9534 3 года назад

It appears that our 115 HP is over oiling? Starts briefly and than quits, may or may not start briefly again ? Pull the plugs and they are covered in oil? What should we be looking for to fix this issue.

@carlosblanco6272 2 года назад

Have twin 2007 115 optimax's had the air and fuel injectors sent out to clean motors run well but both have like a spit back when idiling what is that? Also this weekend while backing up the trailer onto the water at the boat ramp i started the motors when they were tilted all the way up. One motor starred smoking heavly blue spoke like a lot of oil was being burned. It continue smoking oil through the whole day only when i raised the idle over 2500 rpm's but not as heavy as in the beggining. Now when i flush it at the hose seems to be ok what can that be.

@rogeliodeluna2414 2 года назад

I have optimax 150 2002 no rpm.

@liorecitbon9464 Месяц назад

After chaking and trying all and nothing help..-Are you reecomanding mixing queekclean in gassoline for opti whom build carbon on some spark plagues ?

@BornAgainBoating Месяц назад

You can try and use some quickleen to clean out some of the carbon, depends on how much carbon were talking about and what is causing the carbon, other than running rich or just being old

@frankolish2332 3 года назад

What would stop the fuel injectors from opening...besides clogging which I think I would have had some noticeable warning.

@colbybud 2 года назад

Shorted out. With a multimeter connect one to pin on injector and the other lead to the metal case. If continuity then its shorted out. Most often they get low impedance. Clogging causes low impedance due to overheating from carbon buildup. This is why they say not to use fogging oil its waxy deposits can get into the injectors. Also quickleen is needed to prevent carbon deposits. You should also be using 150:1 premium plus 2 stroke oil in the gas to lubricate the injectors. This is because when you shutdown the motor they have no cooling and the oil protects them from damage.

@cyrusm9613 4 года назад

I have an '02 200hp Optimax. It would sit for months between uses and has been hard starting. I have replaced the plugs and had the injectors cleaned. Now, it is hard starting but it starts without opening the throttle and will idle. It still is not right; excessive cranking for an Optimax. I have a 800cca Interstate battery charged and it has proper voltage, I went and got 2 loaner fuel pressure testing gauges today and found that; one the air spikes when I clamp the air dump line, two I get very little air pressure increase when I clamp the fuel return line RPMs rise though(I think you got the wrong gauge described in your video the fuel jumps not the air), three the pressures were about 10psi difference(it was hard to read I could not get a liquid filled gauge). This is maybe the big thing after giving some throttle I will have more than 10psi fuel pressure and when I clamped the fuel return line the fuel pressure spiked the 100lb gauge and did not go back down. I think I may still have two issues still one starting and one with the fuel pressures?

@BornAgainBoating 4 года назад

It sounds like the fuel and air pressures are operating properly and that it might be more of an issue with one of those injectors. Did you have all the injectors cleaned the air and the fuel injectors? It could be the issue if they aren't flowing properly.

@cyrusm9613 4 года назад

@@BornAgainBoating I had the fuel injectors cleaned and I was told they were ok. I did fire a couple of the air injectors off a battery and could see them open and close. In all in searching I have not seen anyone suggest cleaning them, I have only had one person tell me to see them operate. I also pulled the new plugs after about 20 minutes and could see that all the cylinders are firing.

@texashillbily 5 лет назад

Great Info. any suggestion on where to start to repair a very sluggish take off / plane 2014 Merc 300 opti DFI ? it runs great once it gets going Thanks

@BornAgainBoating 5 лет назад

Possibly a propping issue. There's just a ton of variables that could effect that, not having any running issues once your going.

@johnpike5836 5 лет назад

gotta be the prop. i'll predict its not the stock issue on there now. its very likely a racing prop stainless steel on there now. ask the people u bought it from if they have the original prop. or speak to a merc dealer, the specs should be stamped on that prop.

@davidhood6818 2 года назад

My optimax 115 hp dies after running at slow speed at idle after a while. I can squeeze the priming bulb which is flat and it will start all of the clamps are tight as far as I can tell. ???

@andresaquinones5583 3 года назад

I have in 2010 optimax 250 pro xs the fuel rail gets too hot and I cleaned the whole rail and it is still the same?

@lanescott6628 3 года назад

Just found this video. Do the spark plugs need to have the opening of the gap towards the injectors? Thanks

@BornAgainBoating 3 года назад

Not on this engine, they will work either way

@scottjeske7890 Год назад

I need to replace the MAP sensor on my Optimax 150hp 2015 model. Any video on this? BTW, engine runs great until about 4400 RPM's. Any more throttle and the engines bogs down. Hoping this resolves the issue. Geat video BTW.

@jamiecounter4290 3 года назад

i have a 2001 225 optimax i started the engine after it sat for a few months and it was idling when i trying to rev the engine a little it started to miss fire i shut it down and now it wont start things I've checked are spark, i installed new plugs, air pressure at 80 when cranking fuel pressure reading about 82 when cranking, tracker valve is good and im getting power to the injectors but no fuel in the cylinders i pulled i plug and it was dry as a bone getting frustrated ! engine only has about 180 hrs on it wpould be great if you could cover the no start condition thanks ,

@texasfishing254 4 года назад

Boat is only 2 yrs old.. Was out on the water working fine then when getting on plane I got 6 beeps lost power did this 3 times the decided to turn off everything and it worked just fine.. idk what happened.. tomorrow I will go out again and look in to it more since it was dark yesterday..

@BornAgainBoating 4 года назад

You might have a little water in the fuel and the water sensor is picking it up and giving the code

@kenolswfski8862 4 года назад

I have a 2016 250 proxs it stumbles at 5000 rpm but runs perfect below that

@larryleblanc1551 3 года назад

Can you answer the request?

@djrigga 3 года назад

135 optimax problem starts runs okay it can be used flat out when warmed but when brought back to idle it cuts out when at operating temperature any ideas ??

@glendekoker3682 Год назад

I'm working on a 115 optimax cleaned injectors air screens where dirty. Started ran but soon after same problem? I had gauge on fuel cranking only 60psi fuel?

@rikwilliams4132 3 года назад

Hi I have a 2009 mercury optimax 150 2 stroke Have a shifting issue is hard to shift in forward in gear reverse is fine Any tips would help thank

@stephenmcdougald3052 3 года назад

2005 175hp optimax, I can run WOT all day at 5k to 5100rpms but if I try to run half throttle the engine bogs down to an idle unless I either hold it back to wot or let it come to a stop and then hold it to WOT until it starts to Rev up again after sitting sometimes a minute or more. The smart craft usually throws a bell and engine blinking alarm and temp hits 150° while it's idling in gear and when it revs up and I can go WOT again it drops back to 120°. Any ideas?

@joshchristensen3793 2 года назад

Hey mate I have a 90 optimax it has a slight miss at high rpm but only some of the time any thoughts on what to check 1st

@LRCII72 4 года назад

I have a 2001 Opti it's is very sluggish coming out of the hole. Then on top end the motor surges almost like a fuel issue. I've changed spark plugs cleaned injectors replaced 1 air injector. Still only turns about 4900 RPM W/21 pitch prop.

@BornAgainBoating 4 года назад

Sounds like you might have an air leak in the system. Have you tried putting a piece of a clear hose on the fuel line coming into the engine. Check to make sure there isn't air bubbles coming in the fuel before getting to the engine. The boat and hull and weight are going to be what will affect the prop pitch, so there are a lot of variables there :/

@LRCII72 4 года назад

@@BornAgainBoating I'll try and buy some fuel line with PTFE

@jca2908 5 лет назад

Great video 👍 Any suggestions to a 115 opti. that runs fine until ~3500 rpm when opening the throttle, then start to shake violently and then drops rpm rapidly

@BornAgainBoating 5 лет назад

Thank you! Have you gone through any of the tests in the video? Start there and see what you find. It could be either fuel or air but you won't know until you check it out. Then if that is all correct. You might have a failed block water pressure sensor. If you have a smartcraft gauge see what it says for water pressure. If it is zero, that will put the engine in guardian as well!

@jca2908 5 лет назад

@@BornAgainBoating I have now started a cleanout of my VST which had a fair amount of gunk in it. if that doesn't help the next step is a proper bench test. If you could have a quick look at my video that would be great, maybe you recognize the issue. Thank a million. ru-vid.com/video/%D0%B2%D0%B8%D0%B4%D0%B5%D0%BE-u1NvFb8ijcU.html

@kylevantassel7259 Год назад

I've got one of these that runs pretty good down low but falls on its face when you give it the beans. Compression is dead on correct. Anything come to mind ?

@liorecitbon9464 3 года назад

we fixed every thing like it should then it worked great and suddenly it stop in the middle of running the we turn on and died turn on and died some told might be a Low batary power ..? is it so important with optimax that battery will be super strong and new?

@dtaylor6000 5 лет назад

Great video. What would you suggest checking if the option doesn't idle while cold? Once mine warms up its great. But until it warms up to about 125 it won't idle. Thank you

@dtaylor6000 5 лет назад

Plugs are brand new.

@BornAgainBoating 5 лет назад

I would start by checking the pressures and seeing where they sit. Could be a sticky injector :(

@alvarocastillo162 11 месяцев назад

When I measure the air, fuel and air come out, I would like to know if it is normal, thank you

@christinapark6066 5 лет назад

Have a 115 optimax that ran fine until we swapped out pedestal, originally thought a wiring issue, took to marine shop and learned fuel pump was bad We ordered one and replaced, it did start and run for approx 3min. Then stopped. Noticed then the fuel pump had reverse polarity from the original. Suggestions? Now it wont even turn over, but we did swap the wiring to match polarity now. Would this have done damage? What should we check next?

@BornAgainBoating 5 лет назад

That's odd. It happens though. I would stick to checking what has already been done. If everything was working properly before replacing the swivel bracket, then the engine wouldn't start and you found the fuel pump wasn't working. Something sounds fishy with the whole reverse polarity thing on the fuel pump. There are two fuel pumps inside the VST, so if you reversed the polarity on one, then the other one isn't going to be working properly. I'd say to open the VST back up and check over that whole situation. Then as long as they are working properly, move on to checking the fuel and air pressures to see what's going on. Hope this helps and you get it figured out!

@kristievanthul7086 5 лет назад

Um fuel pumps in vst have different size spade fittings impossible to have polarity issues.unfortunatly there are some techs,I won’t call them anything else that will throw parts at an engine,check harness fuses then continue

@brian3.2 5 лет назад

Thank you for this great video. I have a 2007 90hp that will bog down and surge at 3k rpms. No alarms are sounding. I changed th fuel filter and cleaned the vst. Any advice is greatly appreciated.

@BornAgainBoating 5 лет назад

I'd say to start by checking spark and looking at the plugs. Then check the pressures :)

@brian3.2 5 лет назад

@@BornAgainBoating I just had a tech come out and they said the alarm is oil level high. They replaced the tank and the code is still there with no beeps. The boat goes into guardian mode. He now says I need a new ecm. Is this a common failure point? Thank you for your time.

@BornAgainBoating 5 лет назад

@@brian3.2 Ouch, ummmm, well, it does happen. If it goes into guardian that quick, have the tech look at the block water pressure. If the engine doesn't see water pressure than it will automatically put the engine in guardian mode. Unless the ECM really is bad, but it's hard to say without seeing it!

@TheDoug9901 4 года назад

I run 2 filter traps for fuel and one on the engine very seldom have fuel issues. Still get shitty fuel sometimes the primary filters save me and got me back home.

@TheDoug9901 4 года назад

Once it was nip and tuck I was draining water from the one trap to make it back the last 3 miles. Without 3 traps I would have never made it back.

@Lulxiit 3 года назад

I'm considering between mercury 60 HP 4 stroke or a 75 hp optimax, would you say the 2 stroke needs more maintenance?

@MajesticProduce 3 года назад

What causes an Opti to quickly foul all the spark plugs?

@aaronboesel1506 4 года назад

I have a 225 optimax. It runs fine for abit and long eniugh for a ski. But will then beep and possibly cut out... the motor has also had issues with going through spark plugs to quickly.

@BornAgainBoating 4 года назад

Have to check your pressures and make sure the engine is not overheating or oil. Really need to hook it up to a computer and find out what the beeps and codes are!