GTI 337/20th Anniversary :: 2004 GLI 1.8T - CEL Came On / Code P0303 Cylinder 3 Misfire
Aug 20, 2012
So I have a 2004 Jetta gli 1.8turbo and my CEL came on last night from normal driving, after it came on it still drives the same. I had it scanned for codes and got the p0303 cylinder #3 misfire. wondering what could be the solution for this? I dont think its the coil pack because I had them changed at the dealer from the recall about 2 months ago (anyway to check?) Also I have 97,000 miles on my car and my last oil change I used 0w-40 oil. I know this is probably not the best oil to use at this mileage but I had an extra 5 quarts of them laying around so I decided to use it.
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I have searched but with no solid answer..
What I got - 04 Camry, 231K, never had issues, do all my maintenance myself, brakes, plugs, oil etc..
#3 Cyl misfire..
Possible causes
Plugs, - Has been about 2 years since I replaced
Coil - Bought car new in 04, never replaced
Cat - never gave it a second thought
fuel injector - put techron by Chevron just about every oil change, I know I missed one here and there..
burned exhaust valve - say it aint so...
poor compression - I have to rent a tool...
defective computer - I don't think so..
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Code: P0303 Misfire on cylinder #3.
Swapped coil from cylinder #3 to cylinder #6 and fuel injector from #3 to #2.
Shows misfire is still on #3. Plug looks normal tan brown.
#3 is the middle cylinder closest to the firewall I take it.
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It keeps reading the code P0303 "cylinder 3 misfire". All coil packs, fuel injectors, spark plugs have been replaced. The exhuast smells normal. The oil is the correct color(maple syrup color, NOT milky). It's not blowing through coolant. Compression test came back normal. It's not the cat converter because the exhaust doesn't smell like rotten eggs. The car is sometimes hard to start. it hesitates/stumbles and shakes really bad. It feels like its not getting enough power.
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I got a check engine light. I went to Auto zone to get it read & they came up with a P0303 - Cylinder 3 misfire. Since I bought the vehicle a couple of months ago, I don't know when the plugs were last changed, so I decided to change them. However . . .
Is there a secret to getting the plug boots & wires out of the hole and off the plug without wrecking the wires?
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1997 chevy k1500 ... I have a misfire on cylinder 3 that i cannot figure out the cause. The idle is rough, backing out after starting is very rough, it seems to pick up at higher rpms but once the truck upshifrts to the next gear it shakes like a leaf in fall. within the past year the engine was rebuilt all new seals a new fuel pump, new injectors, new everything practically. so far i have done the following:
compression test results:125-130psi
fuel pressure test results: 50psi once primed, 50psi with engine running, no immediate pressure loss after engine is shut off
new spark plug wires
new spark plugs
replaced all four o2 sensors
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So my 2001 5.3L truck has 206,648 miles on it. Over the years, it's been serviced every 5K with the only big repair being head gaskets which were done about a year ago.
Two weeks ago, I hit the gas to merge into traffic and the SES light started flashing and I could tell there was a miss. I got off the gas and a few moments later, the light went out and the miss was gone. I pulled the code and it was P0303 so I change the plugs, wires, and the coil pack for Cyl 3 fuel filter and ran a double dose of Sea Foam through the gas tank.
Bad news is I still have the problem. The truck drives fine; in fact, I pulled my bass boat 75 mile round trip yesterday. Everything is OK till you hit the gas hard to merge or to go up a big hill or pass someone. When you hit the gas hard, SES starts flashing and there is a miss. I also noticed the valves ping loudly when the SES is flashing. The only code it's giving me is P0303.
Could this be a bad injector not delivering enough fuel at higher RPM/under load? I was going to swap injectors and see if the miss moves. Any tips on popping those injectors out?
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01 Taurus, 3.0 pushrod motor. Single 6 pack style coil. I replaced worn plugs 2 months ago for misfire. Car seemed to run fine. Now, I have misfire again. Code is for single cyl, 0303. Would u expect plug to foul, or bad wire, or possibly bad coil? I don't know how these ford coil packs fail. Can u lose 1 or more spark outputs with them?
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I own a BMW not a VW! My 19yr old daughter purchased her first car a few months ago, an '03 Jetta 2.0L with approx. 170,xxx miles. Just after she got it we pulled a P0420 code, but it ran fine so we haven't worried too much about it. I've cleared that code and after about 2 weeks it will come back. Last week it started to have some issues with rough idle, stumbling/hesitation. I pulled the codes yesterday an in addition to the catalytic code is a cylinder #3 misfire P0303. I thinking the 2 codes are not related. I'm assuming the typical things to look for on the misfire are coil, wire, plug? Looks like the coil on this engine is a combined unit so no switching coil packs to see if the miss follows a bad coil pack.
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2009 corolla 1.8l 155,000 miles. Replaced iridium spark plugs at 100,000
I got a CEL few weeks ago, P0301 Toyota - Cylinder 1 Misfire Detected
Car has been running bad for about 2 weeks now, excise noise on the highway, especially up hills.
Yesterday, I took a look, replaced the spark plug in cylinder 1, same results. Checked the coils using one of those flashing tools, all 4 flashed quickly, with no breaks in flashing. put it all back together, cleared the code, went home.
Took it out for a drive today, and it started running way worse. Checked the CEL, and now I have both P0301 and P0303 Misfire on cylinder 1 and 3. Barely made it home, ran VERY VERY bad.
Got home, and made a video of it. It just kept dying. Check it out here. [URL] .....
Also, when it does run, it almost sounds like I can hear excess air, its hard to hear in video, but doesn't sound right. Maybe air leak? How do I check?
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We got our latest Santa Fe computer email and it warned of an engine fault. The car itself was not flashing any warnings though. Took it to the dealer and they said OBD was throwing a P0303 cylinder 3 misfire code. They shifted the ignition coil, and replaced the injector and seal before resetting the code. They had the car for 3 days though. Car was not running rough or anything else you would expect from this type of issue. Still trying to figure out why we got the email with no indication of trouble from the car itself.
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2003 hyundai accentra and I have trouble code P0303 misfire detected cylinder 3 the car would run rough and hesitate at idle and run rough in drive and reverse I checked the plug gap on number 3 cylinder and it was excessive so I regapped it and put back and the car run good for about a day and now the engine light is back and is running rough and hesitating.
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On my wife's '99 Explorer, she just acquired, we had a P0303, #3 cylinder misfire. I found the plug cracked and replaced it. Do the codes reset themselves or do I have to do it? I'd rather not disconnect the battery and reprogram the radio.
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I own the 2014 Santa fe turbo 2.0 litre limited which has 4000 km on it. Within 210 km the engine light came on 3 times. I took it into the shop and they ran a code of P0303 which is a misfire, they changed the coils #2 and #3 and cleared the code. The second time it showed the same code but the shop said it was in the history so that is why the same code came up again. They ran an update ECM? and all was good. Now the 3rd time they tell me no code has come up and can't do anything about the engine (they cleared it) but it was like chasing ghosts. My vehicle runs great so not sure why I am constantly having this issue.
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Got a 1996 Ford Ranger with the 4.0L in it that has a misfire on the #3 cylinder and giving check engine code: P303. Have tried new plugs, wires, distributor, switching out the coil pack with a known good, checked injectors for pulse, checked injectors, moved injectors and still the misfire remains on #3. Removed the valve covers and all appears to be well.
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I changed my sparkplugs and coil packs last month. Was getting CEL light but it would go away after a while. I figured out that I had gapped my spark plugs way to small (almost touching) so I took them out two nights ago and regapped/ reseated them.
My car was running fine yesterday, but today when I started my car up, the engine was shaking a lot for about 10 seconds and the CEL was blinking. After 10 seconds the shaking and CEL went away...
It drove fine. I'm just wondering what could be throwing these CEL's and causing the shaking? Plugs are gapped to 0.32
Also, I had my timing belt and water pump replaced almost two weeks ago now. Any chance that could be lending to the problem?
My guess is that one or more cylinders are screwy. I'd rather not bring it into the vw mechanic since I'm tight on cash.
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Driving the other night I ran drove over a pot hole going about forty pulled up to the stop light and my car starts to make funny noises, barley got the car moving again but managed to get home. I hooked my computer up to it and it says misfire at cylinder 2 and 4.
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I am having this failure in my engine that is making me crazy while I am driving. Yesterday i took my car to a shop to see what was it. my MAF was gone ( I replaced it ) and the failure still going on. The mechanic connected his computer in my car and we went for a ride. HE told me cylinder 1 misfire.
This is what i did.
-change spark-plugs position (failure still)
-change coilpack (failure still)
What can i do ?
-clean injectors
-check for any carbon in valves
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So i have a 2004.5 gli 6spd that had two of the coils go bad and had a serious misfire with engine code and all car didnt want to even move. So i got this fixed made it about a mile down the road and it had a cylinder 3 misfire took it back had third coil replaced and all new plugs put it. Got the car back it ran fine until i hit about 4000 rpm under heavy boost it misfires but no flashing cel like before and the car still runs but cold start warmed up it misfires under boost
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I've got two error codes that are persistent. The underboost code will be fixed (I HOPE) when I replace the diverter valve which is currently sitting in my trunk.
But I'm getting a persistently intermittent P0303.
Here's whats going on:
-Some mornings, I can start the car and get a very minor rough idle, it seems to miss very occasionally.
-Some mornings, PERFECT Idle.
-Some mornings, Flashing CEL, very rough idle, P0303.
It seems to go away after about 30 seconds to a minute regardless. Sometimes ver minor rough idle comes back on hot start, but not enough to set a code.
What I've done:
-Replace spark plugs. (all 4)
-Replace offending coil with brand new one.
Still having the same issues!
Can these two codes be related, and once I replace the diverter valve, things will be better?
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I drive a Supercrew F150 5.4L XLT 02 since 9 years, I put a Fuelflex module since 8 years, since some months I Misfire on cylinder #3 (P0303) but only during towing with Ethanol (over 2000/2500 rpm), when I drive on gas all is fine, I changed Flexfuel modul, plugs, coils, header gasket, without any positive results, it's very curious to have the problem only with ethanol (E85), I can drive very hard and at high speed with just the truck, but with a trailer as soon as I ask more power i lose one cylinder, with misfire...but like I said only on ethanol? I know engine needs more ethanol than gas, so I go check fuel pressure and maybe try to change fuel injector...
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