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? 

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.

Mike Woods: Such enthusiasm. Brilliant thanks

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.

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

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

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! 

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?

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?

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?

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

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???????

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 ?

Alex John: You're awesome Scotty 

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

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?

Richie Johnson: Scotty, LONG time fan here, first time comment. I have a celica with the same, or similar 1.8 1zz in it, shes got 180k miles on her, but still purs great, she has the p0300. Replacing my MAF helped for a few days, but every once in a while when i pull up to a light the idle drops almost to about 600rpm and then i notice the computer compensating, but then it idles unhealthily till I give er gas. Ive got the P0300 and the corresponding P0304 and P0302 codes. She burns some oil and often has black soot on her rear bumper, so the fourth code :( is a P0420. And Toyota also diagnosed the catalytic converter as bad....Where do I start!!!??!? Could the cat be causing the misfire? Ps, Already did plugs, air filter, cleaned tb, and replaced MAF. - Frustrated Toyota owner

Elias Mendoza: I have a 96 suburban, I just changed the spark plugs and wires, rotor, distributor cap, gas filter pic valve and I am still getting the p0300

skyracercr: Hey what about 1995 chevy blazer. .I have the same problem. 

-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.

Gannon Stewart: Hey Scotty!! Great videos man... I'm a DIY guy all the way and I always check your stuff first. Got an 03 Taurus reading codes P0316, P1131, P1151, and OF COURSE P0300. Seems to be misfiring at idle and at low rpm's when I hit a hill or whatever. Other than that, no apparent problems such as fuel injectors or vacuum lines. All seems solid, but the check engine light is on and has been on for roughly two days since it started acting up four days ago. Gotta get my MawMaw's car back on the road asap. Many thanks for all your to-the-point tutorials and of course I could really use a heads up or two before I start chasing this dragon if there is one. Keep rockin' man!

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

Haider Chery: U r a good man

marc rodriguez: 05 lancer es p0300 code bad spark plugs?

Sxyprmale: P0183 (fuel temp sensor) and P0300 (random misfire) Are both codes connected? 2005 Mitsubishi Eclipse GT 3.0L V6

Amr Shafy: misfire

Chadd Chevrolet: Did the battery solve this problem

corneda20: Hello Scotty, can you please help me with an advice? I have a 2006 Daewoo Nexia, GM (Vauxhall) based engine (A15SMS). When i run it constantly over 3000 rpm, check engine flashes. P0300 is the code. Changed spark plugs and wires, tried a new coil pack, cleaned cam and crank sensors, checked compression (14 on all 4 cylindres), checket tappets ok, new timing belt which is mounted correctly, new gas filter. The error still apears under given circumstances. When check engine flashes, no particular symptoms are felt. The car runs normaly, it has power and does not have any particular symptoms. If i restart the engine, the light stays off until i run it again constanly over 3000 rpm. The battery is ok. Thank you.

Seth Nelson: this guy's great. knowledgeable and to the point

East17A: does PCV valve cause effect that triggers the code P0300 ? because i have both codes show up ( P0171 - PCV Valve) and ( P0300 ) - the make of my car is 2002 Mitsubishi Eclipse GT Coupe 3.0L V6 

ruben gonzales: i have a 2006 dodge caravan i put obd scanner andit read p0303 cylider 3 misfire i replace the spark plugs but still having the same trouble van stumbling turns off at stop how can i know what the main trouble is i'm disabled and can't afford an mechanic thanks for any help

Jose Gonzalez: This guy is great! Doesn't beat around the bush...

Terrance Conner: Have a 2010 Chevy Impala 3.5 started having some jerking and some hesitation. Had it checked p 0300 came up random misfire. Had the spark plugs, spark plug wires, air filter,all fluids changed,new oxygen sensor and new belt. Had the code cleared after all that was done. Car is still hesitating and jerking had it checked again but no codes came up. So now i feel stuck i don't want to get throwing parts on and not fix the problem. I first notice the problem after i had a aftermarket in dash dvd player with add on navigation installed.

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