Diagnosing A NO CODE Misfire Using Mode 6 Data

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In this video I show you how to diagnose a "no code" misfire on a 2008 Mercury Sable 3.5 that is not setting a check engine light. This is where the OBD II Mode 6 data can come in really helpful at pinpointing the problem. -Enjoy!
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Due to factors beyond the control of South Main Auto Repair, it cannot guarantee against unauthorized modifications of this information, or improper use of this information. South Main Auto Repair assumes no liability for property damage or injury incurred as a result of any of the information contained in this video. South Main Auto Repair recommends safe practices when working with power tools, automotive lifts, lifting tools, jack stands, electrical equipment, blunt instruments, chemicals, lubricants, or any other tools or equipment seen or implied in this video. Due to factors beyond the control of South Main Auto Repair, no information contained in this video shall create any express or implied warranty or guarantee of any particular result. Any injury, damage or loss that may result from improper use of these tools, equipment, or the information contained in this video is the sole responsibility of the user and not South Main Auto Repair

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31 май 2018

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Комментарии : 794

@mrdfoutz 2 года назад

Yet more proof that a cheap picture frame holding an expensive certificate is no indicator or guarantee of expertise. Mr. O, you are an Automotive Scientist. I'm one of many who wishes our proximities were closer so that you could be MY Automotive Scientist!

@MemorableC 6 лет назад

Eric O, the reason the max for the mode 6 misfire counter is 65,535 is because that is the max value of an unsigned 16 bit integer.

@farmerdave7965 4 года назад

Any numbers higher than that go into the bit bucket.

@kevindowd31021 4 года назад

2 to the 16th

@bihgetofffmysheet2544 4 года назад

@Mr Hansen 😭😂😭🤣🤣

@skinlab4239 3 года назад

FFFF makes more sense :-) Conversion is very elementary in Assembly and C( or it's variants ). Maybe Eric can write his own scan tool? :-)

@brandonlink6568 3 года назад

I wonder if when something hits 65536 and rolls back over to 0 if it knows to throw out the carry bit or if they didn't think it was possible and let it overflow to whatever is before it, in this case cylinder 3 misfire probably.

@somethingsomeone5440 6 лет назад

You make it all look so easy and straightforward. As I follow your diags I'm always like yep that's what I'd do and yep that line of thought is right on the money. But then when I'm stairing at my car with a little misfire I'm feeling like Josh was on that no crank job. Experience is gold.

@researchandbuild1751 5 лет назад

I think it helps when its not your own car

@darreldecker8189 3 года назад

Thank you so much for this video. I’ve had my Subaru serviced at 4 different dealerships and nobody has been able to fix an intermittent misfire. I bought an OBD2 reader, a repair manual, watched excellent videos like yours and finally got it fixed. Thank you

@serenajuma8972 2 года назад

What model and year do you have? I got a scanner and the tech basically said mode 6 isn’t accurate esp on a non subaru tool… I have this same issue. It’s at the shop now

@bernardc2553 4 года назад

From an Old, never retired,honest tired iron tech, admire your integrity, LOVE that little towns patriotism, I maybe coming back soon you Sir are A-OK #1 Ichibon

@elcheapo5302 6 лет назад

Eric, being fairly sure you weren't wrong doesn't make you sound like a jerk, it makes you sound confident. Having seen all of your videos, you have no reason to not be confident. Your diagnostic process and knowledge are seriously impressive. Thanks for another great vid.

@JimmyTwinpop 4 года назад

Misfire with no code. I found mode 6 data in the scanner and then discovered your video to confirm what I was thinking. Great video.

@keithwelton 6 лет назад

Get yourself a couple of cheap eye loupes of EBay Eric, it is amazing what you can see with 10 or 15 times magnification when hunting small cracks. They also show you how your picks are really blunt.

@PaulHigginbothamSr 3 года назад

You know Eric O. That wide gap is everything to me. Cause and effect. No need to look at carbon tracks with a gap that wide problem solved, new plugs.

@paulknowles9727 Год назад

Nailed it pal. I wish all mechs were like you.

@Longtrailside 6 лет назад

Dont you hate it when you get so wrapped up in his videos that you forget to hit the like button and have to come back to hit it. That would be me.

@joecoleman7666 6 лет назад

Bring up the video, then hit 'like', then go full screen, then watch the video. You can always hit 'like' again to turn off the 'like' but I've never had a reason to do this with Eric's videos.

@Longtrailside 6 лет назад

Thats what I generally do, but i forgot and got wrapped up n forgot, twas my bad. DOH!!! Have a good day Joe.

@macboy19 6 лет назад

THANK YOU! My 2009 Merc Sable has the same exact problem, same cylinder. Local mechanic told me fuel filter as well.... had them try this and BOOM - cracked sparkplug.

@jerrypeal653 4 года назад

macboy19 would that then be a plumbers crack ?

@willyluciano9036 3 года назад

This is why i watch sma. 10 fucking years ive been doing this and i have never heard of mode 6. This would have saved me HOURS of time had someone mentioned it of dropping cylinders old school and listening as a test. FUCKING THANK YOU!!!

@willyluciano9036 3 года назад

I also was about to ask why you would keep going with the diag with one coil bad and plugs that look like that when plugs are cheap, easy peesy recommend plugs and a coil, then decided its for the video keep watching. See it doesnt act up with moved coil and id have stuck to my parts cannon and everyone would have thought i did a good job really, but then you find the real culprit and im dumbfounded. I live in pa, a move out to you isnt that far, you hiring? ill take a pay cut if it means learning from the man himself... edit, 4 hrs away and actually my family seems to be migrating that direction anyway.

@SouthMainAuto 3 года назад

FUCKIN WELCOME!

@hanskinslo326 6 лет назад

I still love the intro. Eric O., in the know! A true American professional!! Honest!! And, I think this makes me realize I need to change the spark plugs on my '94 Ranger....

@throttlebottle5906 6 лет назад

hehe, plugs don't last forever and the fancy rare metal electrodes is no excuse. I myself say 50K max on the best of plugs and I've seen the best of plugs that went 300K+ electrode burnt into the porcelain and the ground electrode burnt nearly off to the round shell. 2004 hyundai elantra, it went to the scrapper at 830K+, after it ended up sitting from 2014 to 2017 and no interest nor $$ to keeping it going, (battery, brakes bad and 3rd radiator cracked at top tank) I'm sure it would have broken the big Million mile mark

@scottfranson4215 4 года назад

Had the Misfire last year 2002 Town and Country eX, the dealer did a tune-up .it was fixed . $500 Nows happening again but I notice it did after a week of rain. The dealer said nothing wrong . I can feel the BUMP like you did.I will go back and show Him the video taken with the iPhone. Thank You, Sir. God Bless This Great Country. O one more thing NO misfire at Idol.

@franznevado9525 6 лет назад

Even though I don’t work in automotive industry anymore. Watching Eric O. channel brings back great memories!

@shaneharrison4775 3 года назад

You weren't wrong and you did find the misfires and you found the problem and although it didnt replicate you nailed it fella.

@iamher6422 3 года назад

Not to get off topic, but that is one beautiful town, you have there. Very Americana.. 🤗

@supervitz7178 6 лет назад

Wow. You truly put every tech/mechanic I've come across to shame. I'm in the UK, but if I was anywhere near NY, you would be the only person to touch my cars. Respect for a true professional.

@aaronalphanumerical7705 3 года назад

This video , I subscribed, I'm a mechanic as well. I deal with these issues all the time. He found the problem. The gap of the plugs was the culprit. Large gap and the energy went elsewhere.

@brianhackettZ06 3 года назад

The thought process of diagnosing these problems is never boring .. nice catch

@ernestosolorzano2586 5 лет назад

Your test is exactly what i do.spark plug manuals call it flash over .If the boot has no hole just sandpaper and lube the boot with petroleum gel or that other expensive stuff.however I do replace the spark plug.the burnt part on the ceramic will eventually ground the boot again.keep up the good videos.

@billstreber5194 6 лет назад

Interesting video was nice to wake up to coffee and an SMA video can't beat it

@jonsnell4751 5 лет назад

I own a 1965 XLH1000 HD and it suffered with no spark when hot. Th cause was tracking on the coil. My Volvo V70 Mk2 had a similar issue to yours, that was a slight tracking on the coil pack 3. New coil pack fixed that issue. No or intermittent ABS on the V70 was dry joints in the ABS unit. Removed from car, re soldered and re fitted to the car in less than 30minutes. Yes I am an Engineer but still enjoy your videos. Keep it up 😎

@jimbeam3286 6 лет назад

Another excellent video! I never cease to be amazed by your knowledge and depth of experience. Thanks.

@125sm3 6 лет назад

Great investigation work, always have to think outside the box . Nice one Eric O.

@j.c.smithprojects 6 лет назад

this is exactly why i really love your videos. you take nothing for granted and want to find a definitive cause and not just the effects. very cool video eric. that is one serious gap on those plugs!

@volvo09 6 лет назад

Exactly.... Just calling a coil and full plugs would have fixed it, but you wouldn't get the experience of finding out WHY it happened, and it would have cost more. I For one love replacing only the bad part and love learning trying to track it down and knowing you got it. When people try to fix things like this by just tossing every replacement part possible on the car till they fix it you don't get experience, and it usually causes more issues down the road because most of the time good oem parts are swapped in necessarily with cheap aftermarket jobbies.

@Giorobot 2 года назад

@@volvo09 don't know if you still there but this is one of the best comments ever, it's not about just to change whats broken but to know what caused it

@Nvable 2 года назад

Good evening. I know this is an old video but it is still helping people. I had a issue with a rough running 2003 GMC Envoy 4.2L. It had cam, VVT and crank sensor codes but no misfire. I replaced the parts and it still ran rough. Three days later after replacing spark plugs it finally gave me a misfire. It was in sixn I moved to 2 for easier access and it traveled. I could have used the Mode 6 data to diagnose. Now I know and knowing is half the battle. Thank you for your continued teaching.

@aaronb845 6 лет назад

I am in awe at your diagnostic skills!

@schwartzenheimer1 6 лет назад

Electricity has eyes, and will always find the shortest path to ground. Not sure if they're blue or brown, but it has eyes...very good video. Thanks.

@thedreadedgman 6 лет назад

schwartzenheimer1 electric blue lol

@rtchrg440 6 лет назад

Sweet vid Eric - love learning about the mode 6 data!

@1995jug 6 лет назад

Tough one how many mechanic's would have found that one, good job Mr. O.

@brentowen9480 3 года назад

Honestly, quite a few I bet.

@jimcarmichael2395 3 года назад

First . Your videos are NEVER a flop!! I learn valuable information every single time. Like your humor and your sharp diagnostic skills, aka EXPERIENCE and honesty. California technicians seem to forget that part. Thanks for your time.

@randyhughes5160 6 лет назад

Nothing beats good old know how the stuff we learned when cars had to be diagnosed not just some computer then when the computer comes it is just a easier test but the same old problems good job keep them coming I can see a spark in your attitude I’m glad your team is there

@spelunkerd 6 лет назад

There aren't many times it can be an advantage to work on your own car, but the intermittent problem is one of the best. We can drive a car for weeks with coils swapped, waiting for it to happen again. And we can go back, think about it, research the problem and look for things that we didn't think of. The pro has a huge disadvantage, he needs to be accurate and efficient with a brief look, no mistakes. I know it would have been time consuming to see the waveform but this one would have been fun. Brilliant video, Eric.

@lendrosalazar5642 6 лет назад

spelunkerd man

@eacherenkeka 3 года назад

Thank you Eric! Good to know that we can see that in mode 6 when the scanner doesn't show any misfire! Great diagnosis!

@familyfleetdiy5977 2 года назад

Stopping in to say thank you for taking the time to create such great content, very useful information!

@MrRollercoastersRock 5 лет назад

Recently replaced my spark plugs and boots in my 2008 Ford taurus after watching this video and seeing literally the same intermittent misfires and symptoms at the same speed(45-65 mph 6th gear slight throttle). Two weeks after replacing my car is running amazing and has not misfired since. I'm certain it was a bad spark plug. Thank you!!!! :)

@tightsbk 5 лет назад

You do hunting and car repair two things close to my heart I enjoy both keep up the good work

@sussayn 2 года назад

This guy is great. He knows things. Thanks for the insight. Excited to change out the spark plugs.

@sterlingstephens7093 6 лет назад

Inspector O ,finds the culprit again,bravo sir!

@luiszaragoza3721 4 года назад

Eric, I get the feeling you just love to figure out what these issues are, good job man !

@pontiacsrule8761 3 года назад

Great video. Thanks for helping me out with mode 6. I usually just look at fuel trim data. Keep up the great videos my friend....

@xxhyjynxx5939 4 года назад

Good video! Long time fan of the channel. To kill two birds with one stone, swap the coils of #4 and #6 and swap the plugs of #4 and #5. If the misfire moves to #6, most likely a bad coil. If the misfire moves to #5, most likely a bad spark plug. If the misfire stays at #4, perhaps low compression/stuck injector. Just a thought!

@TomZ23 5 лет назад

This is exactly what my 3.7L is experiencing. I will be checking this with my scan tool on my next day off. Thank you!

@mikevonkleist6767 5 лет назад

You guys are all spot on. Good stuff. I love Eric. He reminds me of me. A logical mechanic. That's how we fix shit.

@wyattoneable 6 лет назад

Yes sir, mode 6 was helpful in finding which cylinders were misfiring on my truck. Nice find on that one.

@denniswilkinson1118 6 лет назад

That's some good info. Thanks for taking us along!

@movingupautodiagnostics8645 6 лет назад

That was beautiful Eric, thanks.

@franksrok5843 5 лет назад

as decades old mis-fire hunter-the best take away here is your driving technique to get a misfire. so many mechanics cannot duplicate a customer concern because they do not get how that rascally misfire is going to show itself. best advice in the video. most ive had to get involved with after the initial attempt at a repair were hammering it up a hill.

@coycarlson4979 2 года назад

Eric - you are indeed one very knowledgeable automobile technician. I would absolutely enjoy working under your lead in your shop - would learn more in six months time than on my own in two years. 👍👍✌️✌️✌️✌️

@JuanOrtiz-mo8be 5 лет назад

Mode 6 gets me out of trouble everytime , thank you Mr O

@arthurfricchione8119 6 лет назад

very good video Eric. thanks for the troubleshooting techniques. very useful symptoms to look for 👍👍

@spencertoolandgrind 6 лет назад

Love the tour of the town!

@michaeldennis3955 2 года назад

As always another great video . I am retired and as a DIYer or Hobby mechanic I love watching You Tube to catch up with the industry . I follow many sites , But I truly believe you are the BEST by far .Thanks for all your effort .

@robertevans6481 6 лет назад

I have not found a boring video from you, always very informative.

@cliffordhill9078 3 года назад

this video you made was one of my particular favorite. I like the portion of the video where you mimic Homer Simpson when you said , stupid cars , I really like how you forge ahead and look for the not so obvious visual causes for the problem even after the problem seem to have gone away.

@feedofiddler6538 4 года назад

That was brilliance in action. You have a good brain on your shoulders man!

@zx8401ztv 6 лет назад

I didn't fall asleep, i was with you all the way to the end :-D Smashing diagnostic, that crack was very sneaky. You could drive a truck through that plug gap, that could have made the tracking worse. RU-vid forgot notifications on everyone i sub to, that's why i'm a day late ::-(

@mja9001 6 лет назад

You are a Diagnostic Genius, I learn something new today, Thanks Teach.

@royrivas972 6 лет назад

Great work. I like how you used the mode 6 to isolate the cylinder that was misfiring. That’s great when you don’t have live misfire pids

@g.fortin3228 3 года назад

VERY good troubleshooting Sir !! The lessons are appreciated !

@joshstauber3335 Год назад

You always prove it. I want to have that ability. Now I think I’m a little bit closer. Thank you.

@gregorysmith293 5 лет назад

Awesome video! You're a kick to watch, and you obviously know what you're doing. I'll be checking out your other videos.

@peternutsrc 5 лет назад

You are amazing, Your the best yet. Too bad I live in Miami, in . I enjoy watching your videos. 👍👍👍 keep the videos coming.

@SmittySmithsonite 6 лет назад

Never a boring vid my brother - only way I'd fall asleep during one of your vids is after 3 or more, 16oz., 151 proof dark-n-stormies. I fall asleep standing up after a few of those ... 😁 I was laughing on the 2nd test drive - you sound just like me. "STUPID CARS!!" I get frustrated like that nearly every single time - I always seem to get the problem children that don't fit a specific failure mode. That was the main reason I gave up on modern junk and went to OPE many years back. Now I'm trying to transition out of OPE back to cars again, since I learned a thing or 2 from you, Paul D, Keith, & Ivan. 😎 Cars pay much better. Great lesson on Mode 6 - three years ago I didn't even know what that was. Now I use it quite a bit, especially on FoMoCo misfires. 2 thumbs up on this one. 👍 👍

@throttlebottle5906 6 лет назад

I've done that before, except far more at 80 octane level, sometimes I comment that way and look the next day like holy moly :)))

@SmittySmithsonite 6 лет назад

I've done that too. I try to stay off the computer in that condition - I get myself in trouble, lol. :D

@throttlebottle5906 6 лет назад

no way, I'd never get in any troubles!!! more like, when am I "not" in trouble =P

@sostrucking 5 лет назад

I tried Pendleton Whiskey while watching SMA and after 3 hours I was done with the bottle. Had to rewatch the last few vids to refresh my memory. Don't go to eBay after drinking either.

@victorr648 6 лет назад

Another great repair by the THE GREAT ONE!!!

@matthewwach7693 4 года назад

Finally found a video where someone is having the exact same symptoms. My 97 maxima is doing the exact same things as this car. Torque converter locks up and the hiccups start. No codes. I'm also getting very bad fuel economy. Hopefully it's all related. Thank you Eric for all the awesome videos!

@jasonfromm5637 2 года назад

Did u ever figure out?

@matthewwach7693 2 года назад

@@jasonfromm5637 definitely the torque converter. Not worth the money and effort to replace it on a 25 year old car. Still driving it as is doesn't affect it That much. Spending a lot on gas is getting tiresome though

@johnmcdonald3720 6 лет назад

Once again great investigation work Eric. Great video as always, thanks again keep them coming.

@mikechiodetti6737 5 лет назад

Seen that before on 6.8L V10 and 5.4L V8 engines in F350 and F250. Great Diagnostic, will keep this for future reference.

@JohnDoesItAll 3 месяца назад

Impressive diagnosis! I've never seen a tiny crack like that, good eye!

@luisoar1277 5 лет назад

Not too many videos on RU-vid, an hour long can keep me watching but this one my friend did and I Learned a lot.

@jeffryblackmon4846 6 лет назад

Good testing and diagnosing, Dr. O.

@papahoe6718 6 лет назад

Wow very peaceful looking When the snow is gone😎😎

@fixitdude9748 3 года назад

Thanks Eric great video.... I actually felt like I was at your shop learning .....

@buscuttbutchie 2 года назад

SMA is the best tutorial for Diagnostics that I've ever seen on RU-vid! Hats off to Eric O and his crew. That being said I have a 2007 GMC Yukon Denali XL 6.2 L with OBD2 code P0 300. I have massive misfire at Pistons 1 and 3. At a rate of 48 and 30 respectively. Also the fuel trim for Bank One is 56 short-term zero long-term for Bank One and 14 short-term and 0 long term for bank 2. Also I smell an enormous amount of gas through the exhaust. All these symptoms lead me to think it's an ignition problem. The car idles. The engine revs but no power when you put it in drive and step on the gas it literally crawls. Any advice that you could give would be greatly appreciated. I was told to check the ground wire for the coils

@chungaleta1234 6 лет назад

Very interesting, I always learn a lot with your videos. Thanks mate !!!!

@TheJmich2001 6 лет назад

Grooving with a pick. Awesome video!

@markebbage9996 3 года назад

Great video - good to see accurate diagnosis.

@Absalon2085 6 лет назад

Great video, lots of info. Thank you!

@daver681 3 года назад

Good troubleshooting Eric, I do like to see you replace the bad parts to prove that you were in the right spot.

@garykniss7289 5 лет назад

During the middle nineties, when I was still working for ‘the man’, we saw very many complaints about light throttle ‘chuggles’ in GM vehicles with the LT-1 V-8s and their ‘Opti-Spark’ ignition systems. In the majority of cases, I would find the problem lied not in the secondary at all, but rather in a malfunctioning EGR valve and replacing that usually solved the drivabilty problem. Especially with the T-56 6spd cars (a result of the ‘Skip-Shift’ solenoid that forced you to go from 1st to 4th at low speed). Indeed, I still do. The problem now is, trying to find a replacement GM EGR valve for a 96 Camaro SS. Of course, GM solved this problem in 98 with the LS-1 as those came with a ‘Linear’ (PCM controlled) electronic EGR valve. A major improvement over the vacuum operated valves of yore.

@Mark-um3hm 2 года назад

Nice find. Saved this guy some money. Nice job👍

@doug184 6 лет назад

Excellent video and information on plugs and fish bite misses!

@jasonwhite8819 6 лет назад

Thanks Eric, Great Video

@russellminnick968 6 лет назад

Goes to show you like my dad used to say kiss it .. “keep it simple stupid “ look at the little things . Love learning this stuff from you ..

@mikefedele4521 6 лет назад

Cool video I think you nailed mode 6 great video.

@nealfox1976 4 года назад

Great diagnose Mr. O!!!

@markwatson2814 3 года назад

Great video about the mode 6 data, viewing all the way from Guyana South America

@saintsarecoming13 6 лет назад

Brother I've been binge watching for a while, you don't know what I'd do to learn just a fraction of what you've forgotten.

@bigwavedave2550 4 года назад

Wow... needle in a haystack (but with a map). Carbon tracking, will need to remember this one! Thanks for another great video Eric O!

@djquack13 6 лет назад

Dude! You just saved people so much money!

@bocolumbine2931 6 лет назад

Eric, that was an odd one. Thanks for taking the time to video that. I was expecting a crack when I saw the carbon trail on the boot but you said pinhole. Sounds like a faulty plug from the start and failed over time and especially with the boot that let moisture in. Thank you. Keep up the good work.

@sonu4ever 6 лет назад

outstanding information delivered. please keep it up in future

@Stover1928 2 года назад

Eric O. YOU are a frickin genius!

@rrmech11 6 лет назад

Excellent job Eric Gotta love mode 6. Test 53. Used it for years. I feel a IDS is coming soon. Lol

@shaunsautorepairs5410 6 лет назад

Good stuff mr O.. Never realy give mode 6 a thought... Will look into it on the next car...thanks

@gregsidel3557 8 месяцев назад

Very good diagnosis, Eric, very, very good.

@johnallen1901 3 года назад

Just watched this video after diagnosing the exact same symptoms on my 2008 Taurus X with the 3.5L V6: Engine bucks intermittently between 45 and 60 in 6th gear, no codes. It definitely feels like hitting one of those bumps where the pavement level changes. So I finally got Forscan running on my laptop, and mode 6 data showed misfires on cylinder 5 (which is fortunate: getting at the back cylinders 1-3 requires intake manifold removal). I went ahead and replaced the coil, and will probably replace the plug tomorrow even though I couldn't find any signs of a crack in the insulation. Also, I'm glad you talked about torque converter clutch failure, which was my initial concern since I had the transmission fluid replaced not that long ago.