How To Fix P0300 Random Misfire Codes In Your Car




What do you think about this video?

chris gorman: Very very helpful, i sure do wish this guy was local to me. Not only could he fix my truck, but im sure hes a funny mofo to hang with. Thanks again for the help scotty k.

tvbuster: Hey Scotty Kilmer, I have a check engine light on and had auto zone check the code. All 4 cylinders misfired in my 2008 subaru wrx but it seems to be running fine. It was very cold out when it turned on. Should I shut off the check engine light and disconnect my battery and then see if the code comes back? Thanks!

Jacob Stull: Hey Scotty, I have an '03 VW Passat with 188k miles. I have the following error codes, P0171, P0140, P0300, P0304, P0130, and P0141. Most of the codes concern an O2 sensor, but my main issue led me to this video. I have a misfire on a code. Whilst driving, I found out that in 4th and 5th gear, a lot of "jumping and jerking" occurs while giving it more gas to accelerate. Can you explain to me what it most likely is? Is it just a leak, sparkplugs, or could it be a cylinder issue? Thank you for the video!

eyad aljamal: what about the ignition coils and Spark Plugs wires . can they effect a random misfire ? 

Frazzled: Hi scotty, If you answer posts, please answer mine. I have a 99 Camry with 2.2L engine. I've kept it well maintained and it has 120k miles on it. Two days ago, it was driving along just fine when it lost most of it's power and the engine began shaking really hard. It feels like one cylinder is not firing at all and a second one is randomly misfiring. The spark plug wires are fairly new - and were high grade. I already tried swapping the cables and it didn't change the engine problem at all. The plugs are all carbonized where the sit inside the cylinder head, but they are double platinum and are working and gaped correctly. There are no vacuum leaks. I pinched off every vacuum line on the intake - and the problem remained the same. The engine has had a new timing belt with tensioner about a year ago (10k miles ago) so I doubt it jumped a tooth. I suspect one of the coils could be bad, but I do see steady sparking on every plug. Each coil provides spark for two cylinders (total of two coils). They are really hard to get in and out because of all the stuff between me and them. I thought about the fuel injectors, but that wouldn't suddenly happen to more than one of them. Do you have any history with this engine and this error? I have a real good code reader. I got the P0300 code one time. After I reset it, the error did not show again even though the engine still runs bad like it did when this first happened. I changed the big rubber intake thing a month ago. The old one had split open slightly. It still ran good even with that crack. Thanks

Manie Moua: Damn, this guy saved me a lot of moo-laa!!!!!!!!

Teze Premillz: I have a 97 cadillac sts. I replaced the spark plugs in 2013 the wires in 2014. I recently got a p0300 code auto zone told it me it says p0307 is misfiring. What could it be? could it be an ignition coil? a while back it gave me a p420 code for about a couple of months then it went away, now it doesn't come up anymore, I never replaced the cat could that be the problem?

flemflam707: I own a 05 Ford Taurus SE with a little over 96,000 miles and I've been trying to find out what's been causing the p0300 and nothing has helped. Did a tune up, changed the fuel filter, both cabin and air filters, cleaned the MAF sensor, checked my plugs that are good, changed the gasket on the intake running valve. * Thank you for showing me how to smoke test a vacuum leak with a cigar, it cleared up the too lean codes I were getting. I still have a slight rough idle. I'm totally lost and can't afford to throw new parts in that aren't the problem. I've got two more weeks to pass smog in California. 

Shakil Ahmed: Scoty u have no idea how much money u just saved me u r every car owners personnel angel keep up the great work n all the best my man n happy 2015 my friend 

Mark Medrano: Scotty!…. Thanks for replying to my last post… Need help again.. I took my car to get the exhaust manifold changed out by the mechanic because my car was running lean.. My sister went to pick it up for me since I was at work and I wouldn't be able to pick it up the next day either.. when I got back I checked out my car and it had a flashing check engine light.. I open the hood and look at the engine and theres a couple wires that were slightly exposed near the exhaust manifold where they placed the new manifold.. At the end of the manifold there is a jolt of electricity that flashes repeatedly maybe 2 times a second while the engine is running and it travels to another metal area about an inch away..I run inside grab my code reader and it was a P0300 code… They're closed tomorrow so I'm going sunday to make them fix that error. Do you have any suggestions on what to tell them to fix.. I love my car and I'm trying to keep it so I can give it to my son as a beater… Note I'm 20… Its a 96 caprice in great condition which is why it bothers me so much that there incompetence has given me a misfire code. PS. It looks just like the flashlight trick you show us but its coming out near the manifold or near it without a flashlight… Thanks Scotty.

PyroCrewTilburg: Hi, I have an Honda Civic EG (D15B2), but having some problems with it. When i floor the gaspedal the car bogs/hesitates. And when i'm coming to an stop the car just falls down in rpm to 400 rpm/ish and hear some weird noise through my exhaust. When i accelerate from the traffic lights the car runs on 3 cylinders, when at 2500~3000 rpm it gives all the power and stops hesitating. Hope somebody can help me 

Cryous: Scotty, my friend recently bought a 2000 Volvo S80 with 195,000 miles. It's throwing a p0300 random cylinder misfire, as well as having a faulty O2 sensor on bank 2 (twin turbo I6). Is there a specific place I should check first, or just run through spark plugs, coils, fuel line? My scan tool data stream also showed that both fuel systems were open, which is a condition I usually only see when a car is off. 

WisSy Cadena: God vídeo ... I watch from baja California Sur México.. I have a mazda 626 1996 ..with P0300 .. This car hava a new sparkplugs and new gas filter... What is the posible problem?

Peter Kapica: Hey Scotty I got a old 206cc Briggs powered snowblower and its misfiring at full throttle only, no other rpm. It's also very very hard to start when cold. The only way to start it is to play with the choke on and off till it starts and sometimes pour gasoline down the carb. The spark plug was never changed because there is very little clearence between the spark plug and the cooling fins on the head so my sockets are to thick. I don't know about the oil, I just add fresh oil when needed. Also the carb was never cleaned. CAN you please help me? I'll need it when we get some more snow.

Bun B: Scotty u are awesome as hell bro, my 98 Park Avenue was already giving me the P0306 code so I knew it was a misfire from my 6th cylinder, then it cut off last night, got it towed and the P0300 code is now showing, I'll work on it tomorrow, thank you bro.

Justin P.: Hey Scotty, my moms 06 Ford Taurus with 70,000 miles idles up and down but runs great while driving; couldn't find vacuum leaks and the fuel trim seems pretty good; besides the idle and also has a long crank when cold. The check engine light wasn't on but when I plugged in the scanner it had a P0300 code and a enhanced P0316 Code. Its a great car besides those issues. Thank you, sir!

dgr_1996: might be a dumb question but why would the battery be the cause?......when the cars running all things electrical are powered by the alternator

Shakil Ahmed: Just one last request can u pls just develope ur app my man that would be really cool 

lahmamamia: Hey Scotty, Can a bad PCV valve cause a P0300 check engine light on a toyota corolla 2004?

Daniel Zewdu: This guy was hilarious 

gary jones: Probably a shot in the air but I have an 03 mustang with a 3.8 v6 with a misfire on the number one. New plugs, wires and coil. Replaced the cam sync. Was told it could possibly be the alternator not putting out enough which it died the other day so it will be replaced soon. If after replacing the alternator it doesn't get any better what else should I look for? Thanks for any help you can give

Jon M.: Hi Scotty, 99 HONDA CR-V 130K on it. Have all the P0300 codes (all cylinders misfiring) Have 34psi fuel pressure. Followed your instructions to the tee. Just got done changing the fuel pump, no change in fuel pressure. The distributor cap, rotor, wires and sparkplugs are recently changed as well. What could the problem be? 

JRZ R: hey i have a 2001 silverado. the truck runs great. but i can't pass the mission test. i replaced the spark plugs, wires, air filter, gas filter, a sensor that goes above the fuel tank, i forgot the name of it. i think is the gas pressure sensor. anyway nothing happened. i put s inyector cleaner, and nothing. like i said everything works good... what do u think my truck has?

Sal Taglireno: Hey Scotty! So I have a 2005 Mazda 6 V6 3.0 along with the dreaded P0300! I changed the plugs not too long ago. They are all gapped fine. Bought carb cleaner, no leaks detected. Bought an OBD-II to see exactly which cylinders are missing... and its all of them anywhere between 20-200 misses per 20 mile drive... took it to mazda dealer... ($90 later) they are saying I need new coil packs.... for the low low reasonable price of $980. Did you catch the sarcasm? Ha. What do you think? 178K miles same packs... how often do they go bad? Should I check fuel pressure and filter too? I just dont want to throw parts at it either... I also dont want to trash the CAT

Handy Voice: Hello Mate I have 2004 corsa c 1.4 twinport 16v. problem is when car is started its fine stationary but as soon as u drive it eventually seems to go into some form of limp mode engine management light comes on the code comes: the car at this stage is very lumpy needs much more acceleration to move , still drives but feels like its struggling to stay on when idle. the revs are not going crazy tho. im getting error code p0300 which indicates unidentied misfires. Ive changed sparks,coilpack,lambda sensor so far no vacum leakess put a new battery in there. stil no luck? any ideas???! many thanks

Bud E: Anyone who can help - I changed three of my plugs and wires. After that I started getting multiple P300 codes, and the car barely accelerates. I triple checked the plugs, seating, wires placement, and am SURE there are no problems. I even put the old plugs and wires back on and same thing!! What could I have done?? Thanks!

Walther Velasquez: hey scotty i have a 94 mx6 ls and got a misfire but i dont know what is causing it. timing is fine both spark plug n wires have been replaced to oem spec. is there any sort of test i can do.

NGSPC4Life: scotty great video as usually, does this apply for a cylinder 4 misfire?

R eM: Hey Scotty, great videos!! I have the misfire codes too and will try to fix it this weekend based on ur videos. My next issue is my shifting for same car, 04 Lancer. Whenever I shift gears, it seem stiff, like no lube. I recently changed the trans fluid in hopes of improving it. It ddnt help. What should I check next?? (Manual trans)

George W: For years I've checked automotive and fork lift batteries using a battery 50 amp load tester. What is your opinion on them?

carlosi nomar: hi there , i want to change my car stereo since it not working how i should, the one currently in it is stock bose I think. I have a pontiac grand prix gt 1999. Which stereo should I get I want one with an aux input. thanks in advance

Zach Gonzales: Scotty you crazy bastard you make me laugh yet inform me at the same time.

jreyes: Hi Scotty, my wife's ford freestar has been misfiring and stalling for awhile already and I thought I had fixed the problem by replacing the fuel filter but the problem came back after she put some fuel in it. It was running fine for about 3 to 4 days until she put the gas and then started right back up again. What do you think the problem could be Scotty? Thanks for your time.

Shakil Ahmed: O yeh billions totally 100% agree

anthony littleton: hello i have a 04 dodge struts has the 2.7l v6 has 101k on it runs good but after start up and a short idle it starts pissing really bad ...if you keep running it it will go away car has a good battery and new plugs along with coil boots and a new fuel pump what could make it do this ?

Troy Smith: After the screws are fixed and no air is leaking, try this scotty kilmer video on p0300. Love ya!

thebuffalodude: Your a good man! Lots good info!

Jared Detweiler: Thanks man

Luis Martinez: hello scotty! thanks for all the great videos you posted so far.. I recently replaced iridium spark plugs on my infiniti g35 2006, put everything properly (specs), and made sure everything was connected and installed properly. As soon as I started the car, it sounded like a tractor. A check engine light lid too. any idea what this could be? can a vaccum leak cause the car to idle this rough?

twinaviation: Hi Scotty, I do have 96' Mitsubshi Eclipse and I am getting P0300 and P0352 both codes on CEL. Not done any repairs yet, but I am trying to get ideas what might those two associated codes to point out. Would be an issue with coil wires or other issues like you mention on video?

antoinethomasj: Hi, I have a 2005 Chevy impala 3.4 L base. I keep getting the P0300 Code. I have to press the pedal for it to start and it idles roughly and stalls or cuts off. So far I've replaced the Catalytic converter, fuel pump, ignition coils, spark plugs and wires, MAF sensor and EGR valve. I am stumped on what could possibly be causing the P0300. Also Something blew out 6 brand new spark plugs that I had bought. I'm assuming whatever the issue is that gives me the p0300 code is the same thing blowing out my spark plugs. 

Richard A: Hi Scotty, Love your videos. I have a follow up question. I have a 2007 Kia Rio that is getting the P0300 error, but it is also getting the 301 302 and 304 codes. Already checked the plugs and they are good. Been told by several other shade tree mechanics that the problem is the coils. What to do you think?

Jonathan Ramirez: Scotty you are beyond cooler than Charlie sheen and Hugh heffner combined. 

Dave Hash: Great video. Always very informative. I have a Chevy Lumina, and was getting the P0300, sometimes P0301 and found I had a blown head gasket at the #1-#3 cylinders. so the heads and gaskets and all intake gaskets, as well as plugs and wires, were replaced. It ran fine all summer. as the weather started to cool, when starting the engine, it starts and runs smoothly, then after a few minutes will start running very rough, even smelling very badly and turning on the check engine light with a P0300. after about ten minutes of driving, it runs great again, nice and smooth, no hesitation and no odor. I am using your techniques today to looks for vacuum leaks. any thoughts?

Charly Gonzalez: Hi Scotty, i hope that you can help me, im havin problems whit my Dodge Dakota 2004 6cil 3.7 lts, the thing is that i have a misfire at idle and the p0300 code comes on, the truck when its Cold in the morning and you star it to warm it up for 5min and then drive wont do any problems, then when its warm or hot at its normal tempeture driving range and you stop the engine for more then 5 min and then you start the engine again and drive of the problem comes on as the truck wont take off freely and feels like is choking, (the check engine light stars flashing and then stays on) if you stop then the engine shakes really bad,but then you step on the throttle all the way to take off again and the engine stars to pass by that problem and then takes of freely and as long as you drive it around and dont stop the engine it wont do that problem more, no matter what speed range you are at it wont causes any problem , another thing is that if you take of after being stoped for more then 5 min and step on the throttle and dont stop or reduce speed to idle seems to by pass the problem at that moment and doesnt do it until you stop the engine again for more then 5 min, the main thing its that it only does this problem when engine its warm you star the engine and idle when the problem comes and you by pass it by stepping on the throttle and drive off it wont come again even of you reduce speed to idle!! And this misfire never comes at hi speeds or médium speeds or at a any speed at all... Only at idle... Any way heres what i have done so far: 1.-Spark plugs changed and checked 2.-IAC valve changed 3.-Fuel pump changed whit filter regulator 4.-Solenoid purge valve changed 5.-TPS changed 6.-PCV valve changed 7.-Manifold intake changed and gaskets of course 8.-checked for vacumm leaks spraying carbuclean around and idle didnt change 9.-Air filter new 10.- MAF sensor new( just in case) 11.-Fuel injectors clean and tested 12.-Fuel rail clean 13.-Air hoses changed to avoid vacumm leaks 14.-Battery test whent good 15.-Crankshaft possitioning sensor changed 16.- ignition coils seems to spark good 17.- compression test good 18.- theres no wet spark plugs when you take it off not for gasoline or oil Thats about all i remember jeje!! I just hope that anyone coils help me... Thanks a lot for your time!!! 

-komodo-: Great video Scotty. I have error codes for all cylinders in my 2004 V6 Saturn Vue P0300-06. I also have two other errors: P0442, P0706. The AutoZone employee suggested that P0442 (vacuum leak) is likely causing P0300+. I know my gas cap gets loose sometimes. Could that be the cause? Going to see if it continues tomorrow. Also, is P0706 likely due to a need of transmission fluid? Thanks! I know I have a lot of questions here.

LoCo hUgO: Hey Scotty nice vid. I have a 2005 honda accord lx and i have multiple cylinder misfire 1,2,3 and 4. Car starts fine. I checked spark plugs and coils. Car idles smooth but when you accelerate it starts to woble like suffocating or asking for gas. Im starting to thing its a bad fuel filter cause the car still runs but ruff. What do you think? Please help me. Thanks

WolfmanZX: I didn't see any CEL on when my battery didn't wanna work anymore. I don't believe that part. The car just didn't start and that's it. I don't believe that part

Suzanne Daming: Hi Scotty, I've got a 2000 Saturn 4 cyl that runs rough and misfires and stalls, but not always. I've noticed that it seems to only do this when it's been rainy, snowy or foggy outside. I used to think this was only a coincidence, but now I'm starting to think that maybe theres's something to this. Any ideas to point me in the right direction?

dawnjuan707: You goofy basterd. Good info tho. Thanx. 

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