How To Fix P0300 Random Misfire Codes In Your Car




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DATKNOCKDESIGN: We think our engine went out, our 99 Oldsmobile intrigue will not start. ( We checked the oil and did not see any sign of oil) We bought the car reader and p0300 code is showing along with P0452,PO453 Im about to go check the spark plugs as you say in the video see if their bad and replace them, (Try to start it) If it doesn't start im going on to the next solution in this video. Do you have any more suggestions?

Steven McMiert: Do your neighbors hate you? "DAMMIT KAREN THAT MECHANIC GUY IS OUT THERE YELLING AT IS CAMERA AGAIN"

TUDDY pena: this guy rocks good video.

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

Lp Liverpool: i got misfires on one bank but not the other side and when i look at the fuel trim was pos on 1 bank but neg on the 2 bank where i me getting the misfire at 

Lokito4ev3r: What could be if check engine is off and starts to misfire just when is stop like in a red light or while car is parked ?? 

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

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

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

gary mathews: great vids Scotty ! in the cold when the car is cold ,the flapper door for the heater flaps alot if the car is not up to op temp .when the setting is for the windshield defrost .the car is a 04 sunfire 44k miles .

Clyde Hammett: 98 chevy malibu, shakes and wont accelerate fast. Changed spark plugs, changed battery, changed coil housing, changed MAP sensor, what else can I possibly do? 

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!

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

Timmy Briseno: 1984 Chevy Cavalier, 2.0 TBI. 64k miles. New Plugs, Wires, fuel filter, oil change, oil filter, and air filter. Cleaned the throttle body out and injectors serviced. Still misfiring and shuddering when its IN GEAR and my foot is on the brake. if i do this for a while (2 mins or so0 the check engine light comes on. When its in neutral its fine. Any advice?

Fred Mercado: Can a bad battery also cause a car to idle poorly and stall out when cold?

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.

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

hitman6191: 2001 chrysler Sebring 2.7l code p0302 Changed spark plugs,code still coming back What else to check?

Floyd Taylor: Any idea on how to fix code p0443 on a 2003 dodge neon?

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 

spenky: Hi Scotty! I keep getting the P0300 code and none other while the car is on the move. Also the car jerks a lot while it is on idle. I have a 1.6l Chevrolet Lacetti (Optra in some countries and Forenza in USA but I think Forenza has diferent engines). I was told that the problem could be sticky valves. Do you think this could cause the P0300 code? Shouldn't I get other error codes if the valves would be sticking?

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! !!!

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.

warrenlikesboats: Started my 2004 GMC Sierra when it was -30 c had very little fuel in it, drove over to a gas station and put in 15 liters..... drove for an additional 15 minute averaging 60kmh until engine light started flashing.... pulled over to an idle and noticed the Engine was throbbing at low revs, and the error code is P0300. Noticed the next day that BLACK splatters are sprinkling out of the exhaust when applying throttle , the smoke itself is white... keep in mind its still -28 c .. the exhaust will appear white due to the outside temp anyways. Hoping maybe something in the fuel system needs to thaw out so Im gonna park it in my garage and heat the truck up.

ricardo picena: I own an 04 Audi a4 1.8l. I've taken it to the dealer because it was my last hope. No one wants to work on it but I understand because it's a foreign car. Now the problem now is electrical. 

jessie morales: Great thanks 

Princezz Doom: well i guess my car doesnt do so good in the rain, its much better now.only thing that i think might have caused it, was that 1 of the plugs were loose from the distributer cap. so maybe water or dampened air could have passed through there

Shaaba Durant: am i trippin or did I see this dude just use a socket with a spark plug already in it. 0:42

Alex Roque: hey scotty , my 01 honda civic is throwing this code and i putr a scan tool and it says its running lean to rich i dont know what that means but it also has code p0421 and im cuious if its the o2 sensor that its causing this p0300 code

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

veli korkmaz: the worst parts is having bad valve or your pistons are the problem, or your chain might slip or your cam position sensor so on and on, alot of things causes missfireing these are the simple ones you check to begin with

Jose Echevarria: Good video. I have a Honda civic 2002 with this code p0300 and problem was bad coils. I bought a set on eBay and turns to have two bad coils sold as new ones but they became bad in a couple of days. Put my old coils back and no more problems. This code could be also bad fuel injectors or clogged. 

TxBlack Label: 2000 4.3L Silverado 245k miles on it with P0300 errors that had terrible idle, poor acceleration, and several cranks to start. It drove terrible in the city, okay on the highway. Ran vacuum test on the fuel line and it failed (thanks Scotty). Replaced the (newly redesigned) spider-injector, fuel regulator, and all upper intake gaskets. Runs like new. For the mechanically inclined it's about a 3 hour replacement.

andrew french: hi scotty, got a 2002 pt cruiser,new plugs and wires, at idle it quivers off and on, slight misfire, got the code today po300.. car runs great when driving, had this about a year, and its allways done this, not a smooth idle.i erased the codes, after awhile driving its fine, starts fine, but at idle same off and on idle quiver, schould i change the crank sensor and the coil pack as a start? it has new timing belt and water pump 2 years ago. it has 166,000 miles, its a clean car and well taken care of. please let me know on this quiver idle its driving me nuts bud, thanks andrew

aznlilchino103: My P0300 problem ended being a double whammy. I changed the plugs on my Mazda 3 at 75k with Iridium Plugs without changing the Coil Pack. At 125k I had the misfire P0300 so had to go into the engine bay. I ended up with 2 plugs were fouled and the coil pack was burnt. Scotty how often does the problem point to a ignition coil?

juan carlos Eleta: Mr Kilmer, I got the same code in my buick century 96, do I have to do a diagnostic test in the shop or I can just take to a mechanic and get it fix??? I'm asking because I dont want to pay for the diagnostic. 

karla ortega: Thanks scotty! i hope my batteryis the problem... i spent a lot of money on a mechanic who hasnt been capable of fixing this problem :( is this really hard to fix or am i getting ripped off?

GundamZero5: well scoty i got this code on my 03 gmc serria i did the cap adn roter wires it might be the coil pack weck spark im also wondering is there any fuses that can be checkt for igtion i did have the parts guy sya hay u might repalce that any who ill check fuel filler i did that 5 years ago maybe over do thanks 

Joelwee1028: Thanks, Scotty! I have a 2002 YukonXL 6.0L V8 that started misfiring a few days ago. I went out and started checking the spark plugs this morning, and then I noticed that one of the coils had somehow come loose from the spark plug. I plugged it back in and started the engine, and it runs fine. That's what I'd call a "stupid" problem, but at the same time, I'm glad it wasn't something really complicated.

fernando mendez: You tha men scotty!!!thanx!!

alpja1: humm what should i do I have P0300 P0301 P0302 P0303 P0304 all together I changed all spark plugs but i still have all those codes I owned a 2003 honda civic hybrid I looked at the spark plugs today they were black like the old one A someone told me that they might get too much fuel >>>What advice can you give me please 

Ruben Alvarez: I changed everything possible and still get a PO 302 on Volkswagen Beetle year 2000 engine 2.0 things changed Spark plug wires, spark plugs, Ignition Coil, Fuel Injector and don't know what else can be causing the problem Scotty 

1835msd: hey scotty, I have a 2000 grand caravan. just replaced the battery, alternator, and spark plugs and still getting random misfires and thumping sounds when you push the gas hard ...weird thing is that is ran fine with the new battery before it was drained because of a bad alternator. any advice and where to look?

l33tpvpness: great vid. I have a 98 geo tracker throwing p0300 and p0400. I have not checked spark plugs yet but i am going to. regarding the p0400 code i have replaced the egr valve with no luck. code still gets thrown, i have checked the hoses and no visual signs of leaks.. any tips? trying to pass DEQ

Joe Patriot: It's true. I once had a dodge minivan that started having problems, and even though the battery started the car nicely, it was old, so I replaced it, and then everything worked fine.

James Billet: Thanks Scotty, I'll be sure to pass on this VERY HELPFUL INFO. Take care and Thanks again

Troyce Hernandez: I drive a 2000 ford f-150 and i got a diagnosis done and they said that cylinder 3 has zero compression. He said that the cylinder was bad. How can i fix that.

ricardo picena: Great thank you :)

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

jessie morales: Scotty i have a 1998 honda accord misfire on cilinder 5 code is p0305 any ideas? 

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