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Old 03-06-2002, 07:08 PM   #1
Evan J. Kelly
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Default CEL P0304 - Cylinder 4 Misfire Detected

not on my car, my bros wrx.

all he has is a k&n drop-in and a mbc set at about 18psi...what could cause that???
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Old 03-06-2002, 07:17 PM   #2
eclipsefire
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Overboost maybe?

Nick
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Old 03-06-2002, 07:19 PM   #3
BluSuby
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I don't know but I've had the same thing happen in cylinder 3 and I have the same mods. I have mine set at 15 psi for the winter though. Did his car misfire in the morning when it was cold out and not up to full operating temp yet? My friend seems to think, and I agree, that with the higher boost and cold dense air getting forced in the engine that in some instances it's blowing the spark out ( the gap is too large).

Like i said I've had this happen, but it was when the car was under full boost and the intake air temp was still pretty cold. I wouldn't worry unless it happens often. I just stay out of the bosst until the car is warmed up more and the intake air temp is up. It never happens then,

Bryan
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Old 03-06-2002, 07:20 PM   #4
wackie
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18psi, good lord. Drop that to 15.5 or so and reset your ECU. The car should be noticeably faster.
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Old 03-06-2002, 07:24 PM   #5
BluSuby
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Quote:
18psi, good lord. Drop that to 15.5 or so and reset your ECU. The car should be noticeably faster.
I agree. Does he have an EGT gauge? Running that kind of boost in the winter time, is asking for trouble. When I'm under full boost with cold intake air temp, my EGT's will fly past 1600 F. Cars love cold dry air.

Bryan
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Old 03-06-2002, 08:32 PM   #6
AK'S REX
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Jesus, 18 PSI!! WHat the hell kind of car do I have?
To calm the confusion, it's set at about 16 or so. I do not yet have an egt gauge, although I can tell you I never let any significant amount of boost build up at partial throttle. Believe me, I take extreme care in keeping it well under 10 psi at anything less that full or very near full throttle.
Yes, it's kinda cold here, but not cold enough to do this, I've driven in colder weather with no probs.
I 80% of the time fully warm the car up before driving, the other 20% I will baby it untill at optimum temp. verified by not only my coolant gauge, but by the oil temp as well. Anyhow, I've reset the ecu twice, and both times it's come back within 10 minutes of driving. The car right now is noticeably slower, idle's very rough and occasionally surge's under acceleration.
So what's the prob? I haven't really checked anything out in detail yet, aside from pulling the code. Plug's?? Coil pack?? I'm going to check a couple of things out tonight, and see what I can come up with. Any suggestions?
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Old 03-06-2002, 08:45 PM   #7
BluSuby
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I would start with the plugs first. Maybe just pull them and close the gap a little and see if it runs any better. If that doesn't work buy some new ones and try it. After that I don't know. My car has only misfired twice. The 1st time it threw a CEL. The 2nd time I could feel it hesitate and I let off the gas to prevent it from misfiring. Try the plugs and let me know how you make out,

Bryan
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Old 03-06-2002, 08:45 PM   #8
Evan J. Kelly
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The thread starter was Jim logged on under my name and not me...

thanks Jim.:monkey:
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Old 03-06-2002, 11:06 PM   #9
tokigiracing
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hush up billjohn
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Old 03-06-2002, 11:42 PM   #10
kensington
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sounds like it's time for an ECU reflash. I've gotten 3 misfires on 3 and 1 on 4 but I've been hearing that they are still sending the chips away to be re-flashed and I don't feel like being w/o just yet.
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Old 03-07-2002, 06:39 PM   #11
IMPREZive 02 WRX
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They reflashed my ECU a while ago, and no CELs since. I got the car back same day too. Dropped it off before work, and picked it up at lunch!
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Old 03-07-2002, 06:56 PM   #12
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Quote:
Originally posted by IMPREZive 02 WRX
They reflashed my ECU a while ago, and no CELs since. I got the car back same day too. Dropped it off before work, and picked it up at lunch!
They probably just reset the ecu in yours. They are suppose to be sent off. Unless they had some "in stock" and they just switched out.
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Old 03-07-2002, 06:58 PM   #13
IMPREZive 02 WRX
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No, I'm sure they reflashed it...SOA is less than a mile down the road from my dealer. I've had about 6 or 7 CELs on the previous ECU.
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Old 03-07-2002, 06:59 PM   #14
AK'S REX
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The resflash sounds interesting. However, how would I know(or the dealer for that matter),if it need's a reflash? Something could very well be f'd up, I don't know as of now.
Anyhow, I'm gonna go check the plugs.

Last edited by AK'S REX; 03-07-2002 at 10:01 PM.
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Old 03-08-2002, 11:10 AM   #15
wrxtremeWGN
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i had the same thing happen to me yesterday. misfire in 3rd cylinder. the car was semi-cold and i jumped on it out of a parkinglot shifted to 3rd and let the car decelerate and at about 4k rpms i popped the cel. went to the dealer today had the code read and i was told everything was 100% fine. no problems yet well see though, these cars are very quirky.
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