How To Fix P0300 Random Misfire Codes In Your Car




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Bernice Brundage: Hi Scotty will oil in the spark plug boot holes cause misfire because all 4 of my boot holes are filled with oil

GeneralDodo: Currently facing P0300 Random Misfire on my Supercharged 08 Solstice.. I'm going nuts looking for what may be causing this. So far, no vacuum leak, new spark plugs, new intake/exhaust camshaft solenoid, the catalytic converter is in great shape.. When I accelerate, it'll drop to 500 RPM then go back to 800 range idle. Some popping in my exhaust and it shudders when idling.. very strange.

Thinking that it may be the tune for the SC? Bad AFR?

Step Doll: Hey scott.. i just got a 2002 dodge stratus rt.. It has the check engine light on reading codes po300,po456,po132.. it has a bad misfire hard to past 40-45 mph i flushed the engine and coolant fresh fluids and the front end started to smoke.. It had a bad battery replaced it... I would love to fix her up what do u think and suggest i do to get it running smooth? Please let me no i don't want to get rip off by a mechanic because I'm a girl.. 

Patrick Wolbert: I've. Got a question for you Scotty
1998 ford explorer
304 code
171 and 174 codes
Changed plugs, wires and coil pack.
Still has a 304
Changed number 4 plug a couple of times still comes back on. Cant remember the gap but i think it right. 50 something.
Next will be fuel filter.
Any other ideas. 

stewyy fam first: I bought a 2000 jeep grand Cherokee out the dealer and the check engine light came on...I figured spark plugs so I checked and they were all wide gapped and bad so I replaced them with new platinum iridium'. codes went away which was 0301, 5...I replaced the spark plugs and all a sudden I was getting really terrible gas mileage. I still have codes 0300, 4, and 6. Jeep starts fine but engine shakes a tab bit. Would you think its more the injectors? My air condition works great so I don't think there could be a vacumm leak but I'll check in the morning. I'm just frustrated I just got it and already problems...but I guess that's what you get with 129,000 miles on it

joshua malezi: I have a 99 Civic. I had a P0303 code, with rough starts, so I decided to try new plug wires as a first step. (previous owner said the spark plugs were changed recently) While pulling out the old wires, I found motor oil in one of the plug tubes. So, I bought and installed a new valve cover gasket kit. I reset the obd and the check engine light came back on with p0302, p0303, p0304 and p0300 codes. What did I do! It's worse than ever.

Herbert Faria: hey Scotty. same misfiring code p0300 after washing the motor. what do you recommend?

davigon: Could a faulty/dirty EGR valve also cause a random misfire? I have a 2003 Eclipse GTS

Dylan Lyons: The most well put together YouTube video I've ever seen !!

Chris Duke: Great video.

rolland rowe: 1996 Corsica. Replaced plugs and wires. Could a MAP Sensor and a TPS also trip the code ?? The car runs like it has a plug wire switched. Made sure that's not the case. 

James Bothwell: Thanks Scotty, I also had the dreaded PO300 code,I have a 2000 GMC Jimmy 4X4 with 4.3 , I've had this truck for 5 years now and it has almost put me in the poor house, I've owned 20 different vehicles in my 58 years and have never put so many parts on a truck or car like this, I can't scrap it now I have to much $$$ invested in it. I replaced the spark plugs and wires, that didn't do the trick so I replaced the distributor and rotor with AC Delco parts and that did the trick, she runs like new, thanks for the help.

Aikeem Williams: I have a 1999 Mitsubishi Eclipse, it has multiple misfiring and I was told by two professional mechanics that I need to replace my motor after they both did diagnostics to it, I really don't want to give my baby up, is there an alternative?

Joaquin Pena: Hey Scotty,
I have a 2001 Toyota Corolla that has the code P0300 and throws some black smoke when cold. When I first got it, it did not throw any smoke at all, but once I changed the oil and the spark plugs it started to throw the black smoke. It doesn't have the check engine light either. What can I do to make sure what is the main problem of the car?

ivan topete: I have a 1996 grand cherokee laredo 6 cylinder has check engine light on nd I got the codes nd it showed that I have a misfire in all 6 cylinders I changed distributor cap rotor spark plugs nd cables also the coil pack but when I changed the coil pack my car got worse so I put the old one nd doesn't turn off but I still haven't the misfire in all cylinders wat can it be ..

TheKorawat: Thanks Scotty

HighCarb Danilion: I have a 2000 Grand am 3.4 litre, recently i experienced hesitation between 2-3 rpms and then hesitation through the gears.. I had it checked at auto zone, and it came up knock sensor 1 Cylinder2 misfire and some code for air intake.. I believe it could be my spark plugs and wires.. and also my knock sensor.. what do you think? and how should i go about fixing this

amatelk956: Checked everything  Scotty on a 96 ollds Ceira  3.1.. then found bad plug wires ! pocode300  ouch !

amatelk956: This code is death ! Sometimes !

School: Thanks for teaching us how to fix it. The problem with most Medical assistant in california is usually the cost of education. Hopefully it'll pay off. Thanks again.
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