How To Fix A P0300 Random Cylinder Misfire

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P0300 Engine Misfire. In this video, I will show you how to fix a random misfire in your car.
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How to stop random engine misfire code P0300 with check engine light on and identify what cylinder is misfiring. Engine randomly misfires inspection, troubleshooting, and repair.
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Reggie Curtis The Flat Rate Mechanic. 25 year ASE Master Automotive Technician and Advanced level ASE certified. #P0300 #FlatRateMechanic #DIYAutoRepair Check out The Flat Rate Mechanics Tool Store on Amazon goo.gl/M8MpdC  
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Disclaimer:
Due to factors beyond the control of The Flat Rate Mechanic, it cannot guarantee against unauthorized modifications of this information or improper use of this information. The Flat Rate Mechanic assumes no liability for property damage or injury incurred as a result of any of the information contained in this automotive repair video. The Flat Rate Mechanic recommends safe practices when working on cars or trucks 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 repair video. Due to factors beyond the control of The Flat Rate Mechanic, no information contained in this automotive repair 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.

Опубликовано:

4 окт 2024

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Комментарии : 71

@shawnberg5691 4 года назад

Excellent straight-to-the-point explanation and diagnosis. Thank you for taking the time to help the rest of us.

@FlatRateMechanic 4 года назад

You are very welcome, glad it was helpful

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@Sean John instablaster :)

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@jameszelaznysr.2681 5 лет назад

I appreciate the help thanks, feels good to know there's still some good people around .

@nickelanddimediy 4 года назад

Thanks for the video. This was exactly what was wrong with my Lesabre. I got a new ignition module and coil pack, runs great now. No misfire, no check engine light. Thanks again!

@josephureneck925 4 года назад

Same with my Lesabre, 2005.

@nickelanddimediy 3 года назад

@Tongan Spartan I got it on eBay for $80 about a year ago. It came with the ignition module and 1 coil pack. The seller was Car Parts Wholesale.

@peternorthrup6274 10 месяцев назад

Got the same code on my 04 expedition. Mine was an easy fix. Start the engine. Pump the breaks 6 times. Turn the head lights on. Power down both rear windows. Put seat belt on. Turn radio on and off 3 times. Pump breaks 6 more times. It worked. Runs great now. LOL. Have fun.

@t.r.8386 4 месяца назад

All the same but also have to open left rear door two times

@rogerramirez9400 8 месяцев назад

For any one, I had a misfire that i couldn’t find for about 6 months. Replaced all ignition coils and wires, spark plugs, air filter with maf sensor even map sensor, pcv valve and checked for vacuum leaks. I finally found that it was my intake manifold gasket that was leaking, so I just recommend don’t go into blindly replacing everything spending so much money and keep doing tests to be sure what’s needing replacement

@johnvonasten466 Год назад

You are a god you just confirmed my suspicion about my vehicle. Had it tested still tested good but once under pressure/load it doesn’t thank you

@rjpresley5435 Год назад

Best description video I have seen on here and I’ve been scrolling for awhile😂 thank you sir definitely will subscribe

@OniPutItOn 3 года назад

this was exactly what I needed

@radvalve205 3 года назад

Nice info here. With my buick 3.8 it would run fine until about 20 minutes into my dtive to work, the same driving home first 20 minutes was fine then it would start missfireing an show a P0300. I used a chesp 10 dollar spark tester an a spare plug wire i hsd in trunk to check each coil, with the spark tester adjusted to 1.5 inches top an bottom coil sparked, but center coil would not until i screwed in the tester adjuster to 1 inch, an this was with a cold engine. I moved the coils around an had same issue with middle position coil, others were fine. Bought a new ICM an issue fixed. Think the old one was heating up after 20 minutes and the already weak center position would just stop producing a spark.

@ejthebeau2963 4 года назад

This was extremely helpful Thank you

@barryallenflash1 4 года назад

Thanks! This happened on my Montana van last year, it's a 99 and STILL has most of the original parts, including the coil packs, which is what it was that needed changing. This code came up again today leaving for work, gonna test it tomorrow, but prob one of the other coil packs. Thanks for the simple solution to this code. I'll let you know the results.

@ZeusAndKiller 3 года назад

Very interesting. Great video

@bbay1977 4 года назад

Thanks for the video. I just hope this fixes my code as well. Crazy how a lot of things can cause a misfire though. Thanks and keep up the great work

@AntonioEscobar863 3 года назад

No jokes. Currently going thru it now. Going back at it tomorrow.

@bbay1977 3 года назад

@@AntonioEscobar863 try swapping your coils around to see if the misfire moves. I had a bad coil that would work fine and then mess up and then go back to be good again. I finally just got fed up and took mine to a dealership and paid the 100 dollars for them to tell me it was a bad coil. Left there and bought a new coil and installed it. Been working great every since.

@AntonioEscobar863 3 года назад

@@bbay1977 I replaced all the ignition coils, spark plugs, egr valve, o2 sensors and the fuel pump. tomorrow I’m replacing the intake manifold gasket. I did a carb cleaner vacuum test and the idle changed when I sprayed around that area. Hoping that’s the culprit. She sounds like a brand new car , but she’s still got a misfire and I’m praying that is it. I’ve also replaced a few hoses that looked corroded.

@bbay1977 3 года назад

@@AntonioEscobar863 Yeah with the idle changing I would say that is probably going to be the issue. Just as long as the spray didn't hit any other cracked hose you might have missed. Good luck with it. This is my last car that I have that is fuel injection. I'm going back to carbs and no computers soon. Mine only has 87k miles on it but I think I'm done with all the computers and all. It was a mess trying to figure out the misfire on mine and then I still had to pay someone to tell me what the problem was.

@AntonioEscobar863 3 года назад

@@bbay1977 I did that gasket replacement, and I fixed the misfire. Did not realize the level of difficulty for that task I signed up for, but I did it and a little extra. Intake had a pretty serious build up of carbon in it so I cleaned her up and replaced a couple hoses, but none of that was the culprit. I had my timing belt replaced by my mechanic about 2 months ago, there’s a censor right to the outside of the cover that’s messing a bolt that he didn’t put back but also had the clip to snap the sensor back broken. Turns out that was a big culprit in the misfires. Plug her up, taped her down and now she’s running great. Thinking I’m definitely doing all my own work from now on. Didn’t have any extra nuts or bolts left, cleaned and snapped every censor in place, replaced a few old looking hoses, and feel like the man for accomplishing such a feat. Think I might go get my certifications and start a small mobile mechanic business. I learned so much. Wild that a censor that’s not connected properly bc it had a broken clip could cost so much trouble. But, thankful for the process of learning my car and turning some wrenches. I think my car appreciates the cleaner intake system and tune up, getting about 45 miles to the gallon on my 06 eclipse right now and she sounds so good. Idling at a solid 600, runs a little cooler and that gas mileage is a big plus. Hitting the junkyard tomorrow to get the nuts and bolts my mechanic didn’t put back in and doing my own work from now on.

@josephureneck925 4 года назад

Thanks. Very helpful!

@TheJhit16 4 года назад

Awsome video man helped a lot thank you. 👍🏼

@jackharding98 Год назад

Thanks for the info, I appreciate it.

@terrydoberstein6742 3 года назад

Have a 2005 impala 3800.. was miss firing no code. So I started pulling 1 plug wire from the ignition coil. Module 2/5 was not arcing/sending spark. Change coil pack. Still not spark. Changed out Ignition module was BAD. Issue solve.

@myyoutubechannel3161 9 месяцев назад

Does this test mean the cylinder is good ?

@marvinautoworks9955 5 лет назад

What kind of scanner are you using

@cbarkwell1000 4 года назад

GM Dealership Tech 2 Scanner

@alexismoreira9578 Год назад

Thanks good video

@hankbridges5055 5 лет назад

A timing light can uncover misfiring wires and coils and plugs. Spark plug wire pliers can be used.

@checkingthetoob 5 лет назад

Hank Bridges how?

@hankbridges5055 5 лет назад

@@checkingthetoob A timing light shows when the plug fires. If the light don't light, it's either the wire, plug, or coil. Spark plug wire pliers remove the wire without shock.

@davidyj9013 Год назад

So what does one do when the ICM, all 3 coils, plugs, and plug wires have been replaced and you still have an occasional misfire under mid-range throttle? No problem under W.O.T.

@leonardoquinones4925 8 месяцев назад

Check distributor

@rockyrupa7321 5 месяцев назад

Ever fix it?

@leonardoquinones4925 5 месяцев назад

@@rockyrupa7321 yeah

@altonrowell7854 2 года назад

Thanks man.

@grullon120 5 лет назад

thnks for t he video mate

@FlatRateMechanic 5 лет назад

You're Welcome!

@mikeprice8307 4 года назад

@@FlatRateMechanic what about on a 6.1 hemi ? It shows misfired cylinders but they happen on different cylinders randomly

@B-S1999 3 года назад

Can you give me link to that obd2 scanner u got. Also I've got 09 Toyota Camry v6 and getting p0300 but I have coil packs how would I test them

@brandonGCHACHU 2 года назад

Thanks!

@tomtilford2101 Год назад

I just changed the ignition control module, it was still missing. Switched the coils around, and then it was fine. This lacrosse is very strange.

@shouldHaveBeenAborted 2 года назад

Thanks! This was helpful in diagnosing a bad, new ignition coil on my 99 buick lesabre. Much appreciated sir.

@southsidetv773 Год назад

Is that misfire graph on certain scan tools? If so does foxwell have one that has that feature?

@elaavgroup2660 5 лет назад

Hi , my Audi A3 8l, 1.6 benzine 2001 misfire on sunny day. Other day , it won’t misfire. Any idea please??

@mohinuddinff4977 5 лет назад

Thanks

@PRS-kz7cc Год назад

Scanner being used?

@magnacarta5261 5 лет назад

Just change all

@jrrifenburg6251 2 года назад

my not coil packs put brand new ones on still miss fire

@daviddowns7552 Год назад

i think i had code but its gone. is this common ?

@migrantspark8007 4 года назад

If I’m getting sparks from all mine what else could it be

@colinlindgren7378 3 года назад

Intake leak, vacuum leak, injector problem, fuel pump a few different things really

@aaron5785 3 года назад

Clogged fuel filter, or bad fuel injectors, or leaking fuel pressure regulator also can cause misfire issues.

@AntonioEscobar863 3 года назад

Also check your censor connections. Get some sensor cleaner spray disconnect your sensors, wipe them down, spray them and make sure you got good connections. Just fixed my po300 code and replaced a lot of stuff and the whole time I had a sensor coming loose off the the timing belt cover that was the culprit. The clip was broken when I payed a mechanic to replace my timing belt and the censor was got loose after a couple weeks and the fun began. Replaced a lot of stuff trying to figure out this code and the whole time it was one little censor handicapping my car the whole time.

@Dannyaudio69 4 года назад

Whats that misfire reader tool you used?

@Ensource 4 года назад

someone said: GM Dealership Tech 2 Scanner

@Salahtv486 2 года назад

Random missfire mean go change 1 and 6 spark

@duranchappell9376 3 года назад

No power on Oldsmobile router

@TBD3.0 Год назад

👍🏻

@saintanthony1529 3 года назад

Can anyone tell me if misfiring cylinders can cause an engine to seize? I have a 4 cylinder honda; the engine seized a couple of days after I had the scan done.

@colinlindgren7378 3 года назад

99.9% chance that it won’t cause that. Unless it was misfiring for so long that it weakened a connecting rod or something and that broke and blew the engine. But yeah in 15 years of working on my own cars and 10 years in shops I have never ever seen that happen