How To Fix P0300 Random Misfire Codes In Your Car




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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!

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.

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.

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

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

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

thebuffalodude: Your a good man! Lots good info!

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

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

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? 

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 ?

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

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

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?

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

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.

Johnne L: you're the man scotty....love the enthusiasm and how you get right to the point!

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?

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

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?

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!

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?

-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.

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!!! 

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. 

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?

Charles McGowan Jr.: Hi Scotty, I have changed all plugs, I changed all ignition coils, and crank sensor and 2 o2 sensors in my 2003 nissan maxima 3.5 I am still getting the p0300 code, the car starts up fine only when given gas in neutral or in gear then it starts missing do you have any idea what else could be an issue. The car drove great then while driving in just started missing and had a major loss of power and the code came p0300

Jorge Gonzalez: Scotty, greetings from Mexico, we have a 96 cutlass ciera and this is the problem: when the engine is cold and turn it on, the motor starts to shake and light "service engine soon" flashes (DTC: p0306). This failure only occurs when the engine is cold, if the engine has its operating temperature works well; has new spark plugs and spark plug wire. Change one of the ignition coils and return the same error code, about a month ago I put Lucas injector cleaner in the tank and the problem persists. I have not done a cylinder compression test. Could injector problem or issue with the cylinder valves?

Oscar Trujillo: Hi Scott me again I put the scanner in my car and that code came up I had change the spark plugs not too long ago and the code still comes up my question is will I damage my engine if I spray some of the carburetor cleaner around the intake manifold but it's not plastic its like aluminum or steel I have a 02 Nissan maxima

Johnny Garcia: Wow you videos help me out a lot thank you so much my car(1995 CHevy blazer) was giving me code p0300 I checked everthing on video and last thing I checked was my air intake it was cracked so I replaced it and car is running much better thank you once again

Jorge Luis Amezola: Hi i have a 04 tahoe that has a random miss fire it doesn't say which cylinder but the hole passager side if i umplug the coils nothing happens but when a do the driber side it like it traing to die and my check engien ligh some times blink and that wend the hole mees start this are mi codes P0430 P0171 P0101 P0174 P0300

KaleebtheMighty: Hey Scotty!! I have a 2002 Dodge Dakota Slt Quad Cab, and I'm getting the p0300 code. Is there a common issue with the dodge dakotas that I can check or something that I should check first? Thanks for your help!!

Stephen Kuper: Great vid! Red light was on,on scanner, emisn. 4 codes came up in this order one repeated. Getting a P0440, P1448, P0325, P0440-again. Car 2001 nissan 2.5l. Car ran ok,no chk eng light when shut off friday. Started sunday engine stumbling. Shut down. Ok on restart, no check engine light. Car drove 1hour no problems/no chk light. Gas cap, fuel filter, maf sprayed and vent control valve replaced, dealer parts 3-months ago . Any ideas? Thanks. Any chance leaking fuel injectr/loseing all the presure over long period of time, or weak fuel pump?

Clint Black: Hi Scotty, I have a 2007 Chevy Silverado LT with the 6.0 liter V8 that is showing a P0300 and is shaking, has a loss of power and smells as if it's running rich. I have changed all the spark plugs, replaced 1 coil pack that was bad, cleaned the Mass Air Flow Sensor, replaced the air filter and I am planning on using Sea Foam fuel system cleaner to clean the injectors today. As of now it is still exhibiting the same code P0300 and all the same symptoms. What do you recommend doing?

Remo Sarnelli: Scotty! I have a 2002 nissan maxima! Its reading p0300 code! what is the problem?

Andrew Lessane: SCOTTY I have a altima 2005 and it's giving me a lot of issues. I'm about to do those tips you just showed me. I read up on the car and a lot of people having the same problem with the car. Rapid shaking, misfires, gas is becoming a big bill. It's the Nissan altima 2002 to 2006. If you have any solution for this vehicle just text me back.

George Oliva: Hi Scotty, I have a 2004 VW Passat. Can a faulty turbo trip the P0300 code?

connie garrett: Hey, I have a 2003 pt cruiser 2.4l 5 speed just bought it and the man we bought it from said he missed a gear and code needs to be reset, Sometimes it doesn't want to go when in gear and I put the gas on but other than that it works like a charm. but we just found out the car has multiple code problems which are: p0166. p0300. p0303. p0522. Is this something that the codes can be re rest and then drive the car awhile to see if engine light goes out?

Stefani D: I have a 2005 Chevy Optra (Lacetti) with this code. Changed spark plugs and ignition wires, but nothing. Transmission has also been acting up for about a year before this, slipping into gear with a big scary clunk and feels like the car hit a brick wall for a split second. Cannot replicate this for a mechanic and it's not throwing a code. Any ideas?

toby griffiths: Excellent video, thanks!

Michael Bayona: I have a 1997 Chevy S10 with a 2.2L engine. I keep getting the Random Misfire code P0300. I had replaced ALL vacuum hoses and lines, spark plugs and gap them to 0.060 inches, replaced the spark plug wires, MAP Sensor, All injectors, Ignition coils ALL to include the ICM. Switched to different spark plugs, and wires, O2 sensors front and rear, Cleaned upper intake and replaced gasket. Replaced exhaust flex pipe do to exhaust leak, replaced CAT and muffle, new fuel pump. And I am still getting Random Misfires. Engine use to start with just one turn of the key before the above was changed. Now you have to pump the throttle peddle while holding the ignition to get it to start. Just today I had changed the ECM and did the 30 min procedure for pass lock. Just today I am getting a rich bank 1 code, and still getting the Random Misfire code. Check engine light no longer turning on. After engine is started it idles and runs. I looked at the fuel filter and it looks fairly new, however thinking on changing that out tomorrow because I am out of ideas. Need help! 

EL CHEYO: what about a 2007 dodge charger R/T POLICE EDITION CODE P0730 GEAR RATIO INCORRECT

mikeyd19841: LOL i love this channel! Cheers

Gary Clay: Hi I have car 2002 mercury grand marquis 4.6litter v8 still come on light engine check PO300 random misfire detected ? U can tell me help I will fix my car ? Thank you

obarcus taylor: Hi Scotty How you doing I have a 99 yukon freshly rebuilt new everything or pistons valves and all and it's still pulling up the code p0300 

miguelrodriguez86: Hey Scotty I have a 2006 dodge stratus v6 2.7l non flex fuel my question to you is about the spark plugs is it possible to remove the back three spark plugs 1,3,5 without lowing the engine?

8517macman: I have 1998 Pontiac Bonneville and I have the p0300 code, but I have no spark in my coil pack which Is the 3 and 6 terminals. I changed the coil pack, icm, spark plugs, and wires still no spark in the same two terminals. My question is what can I do next to fix the problem?. Could the fuel injectors or crank sensor play a role in the coil having no spark? The 3 and 6 teminal is the same coil pack. My car has 144.000 miles Please help.

Dante Maladonado: yeh ihave micelica gts new spark plug and fix mi engine light and do mi emission,after 2 month i get engine light whit that code and dont know what it is but discarding the plugs now ican check the rest of the prosedure ty alot

Adam Evans: Scotty I have a question. My mother's car is pulling up a p300. It's a 05 Chevy Monte Carlo, 3.4L 170,000 miles. I've done all new coil packs, all new plugs, and fixed one vacuum leak at the intake plenum. It still shows a P300. It misfires horribly at idle, and if you take a slow turn without your foot on the gas, it dies. Is this a common problem with these? I'm going to check fuel pressure tomorrow.

Johnny Alexander: Hey Scotty I have a 2001 Honda accord with the 2.3l 4 cyl and i have p0300 but ive replaced the plugs and wires what else should i look into!?

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