How To Fix P0300 Random Misfire Codes In Your Car




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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? 

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

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.

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

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?

-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.

mikeyd19841: LOL i love this channel! Cheers

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?

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

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!!

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

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. 

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

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 

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

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

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?

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.

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?

Mike Woods: Such enthusiasm. Brilliant thanks

Nikeion Wynn: Can you test the ignition control module with a multimeter? 

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! 

Haven Medlin: I love your videos, Scotty. I've have a P0300, P0172, P0420 on my 2004 Chevy Cavalier. I've done everything I can think of. I've done everything suggested in this video. Got any idea what's wrong?

ChandoulA: amazing video !!! 

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

Linda H: i have a 1997 mercury villager gs 3.0L engine made by Nissan. i had the timing belt replaced by a friend and we lined everything up. started it and it ran like crap. checked codes and its the random miss fire code. replace fuel filter ,spark plugs, spark plug wires, rotor button, distribator cap, starter, and battery still bad code could it be the vacuum lines?

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.

Travis Smith: My chevy wont go pass 30 mph. I put on new thottle body cable handled. still same thing

Daniel M: What if my car miss fires but at high rpms? Start up is fine and low revolutions are fine but hit the peddle and i get random miss fires i eventually get the car up to fast speeds but contant back fire. No check engone light tho

Ephraim Camacho: Thank you for all your help and video's

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!

Malachi Carty: I have four codes with my sea light here is what they are in order p0128/ p0302/ p0300/ p012. I have a mitsubishi eclipse 200. It runs good and for awhile the it runs crappy and goes back to good again. My car has always had an idle problem and my car doesn't have a cadlac inverter on it cause some one cut it off along time ago. I've already put new spark plugs in but I've got a baby on the way so I need my car fixed and I need my money!!! Any one have any ideas???????

Ryan Yates: Hi Scotty, I have a 2003 hyundai accent i have the p0300,0302,0303,0304 codes, I have replaced all the spark plugs, the coils, the coil pack, had the fuel injectors changed, fuel filter replaced, the last thing i could possibly think of is possibly the timing jumped a tooth, what are your thoughts?

ariot parra: multiple misfire on civic gx 1998 CNG (compressed natural gas) i have done this till now -Replace engine oil -replace spark plugs (PFR7ND) NGK -Replace cng gas filter (under the trunk) What else do you recomend me to do? i am thinking to replace: -NGK spark plug wire set -Distribuitor cap -Distribuitor Rotor -Distribuitor coil and my last options are: replace egr valvle clean cng injectors maybe change catalityc convertor i will apreciate any help Thanks

Edward S: What about fuel pressure regulator if you smell gas on the vaccum line coming from FPR its bad. The FPR fills up with fuel and then gets sucked into the vaccum line and into the intake manifold then goes down the air valve and causes rich running and flooded condition

Aaron Esquivel: I took off pretty fast at a red light & my Rpms went high & then I heard a loud poopin noise from the exhaust & my check engine light was blinking. I checked the code & it said I had multiple misfires & some reason my drive shaft is leeking black. Thanks if you could help me out 

Jerry Ledesma: You're awesome! Thanks :)

trickydicky7383: Hey scotty.my 05 3.7 lt dodge is throwing up a p0300 code along with a p0138 and p0158 o2 sensor code. Iv checked for vaccum leaks .changed the plugs coils imtake gasket. Cleaned the intake, injectors all that good stuff and still the problem persists. Have you any advice that may help me ?

Jon Focker: nice!

Alex John: You're awesome Scotty 

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

Karen Castro: I have this combination of error codes p0705, p0141, p0301, p0303 and p1399. What to your knowledge do you think it could be? I have already replaced the spark plugs and wires also the distributor. Still misfires. Replaced PCV Valve. No vacuum leaks. I'm stumped. Please help! !!!

justin phelan: 2000 chevy blazer first was missfire on 5 and 6 changed those two plugs and the wires cap and rotor now I'm have a multi missfire code and the truck won't even sit idle just dies rite out any thought all the wires are in the correct places went over it several times

toby griffiths: Excellent video, thanks!

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?

CharcoalJoe: THANK YOU

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!!! 

Ross Griffus: You da man!

Scotty Kilmer: How To Fix P0300 random misfire codes in your car

Gianfranco Seminario: I got Evap Code P0443 and P0106. Should i replace the purge sensor?

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