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Old 08-18-2004, 10:12 PM   #1
edkwon
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Default CEL P0304 - cyl 4 misfire, want people's thoughts

Ok, i just threw a P0304 with the blinking CEL today. Here's the situation. I have an 03 WRX, here are my powermods:

UTEC piggyback ECU ver 4.2
TXS turboback exhaust with high flow cat
Stromung type XA single tip 3" muffler
replica Perrin solid uppipe
Sti ver 7 top mount intercooler

Basically, i was driving around the city puttering around no faster than 30 mph ready to go home and then suddenly i got the blinking CEL, quickly scanned and got the cyl 4 misfire code. The whole engine block is shaking like its offbalance with a rough idle and running in limp mode, much like the guy in this thread.

Now what i understand after doing some reading is it could be:
1. blown #4 cylinder (worst case scenario)
2. failed spark plug (replaced stock plugs with NGK copper plugs about 6K miles ago
3. burnt out coil pack

With my mods i realize Subaru would probably just void my warranty and give me a hard time, so i am probably going to do the diagnostic work myself, like moving the coil pack to a diff cyliner, inspect and possible change #4 cylinder plugs. I know that a compression test will ultimately rule out the worst case situation.

Just to get other people's thought, how likely is a blown cylinder if i haven't driven aggressively that day and was just going thru stop and go traffic no faster than 30-40 mph? Somehow i feel like its more likely a plug/coil pack problem than cylinder/block. I drive aggressively sometimes, but most of the time its normal city/freeway driving with an occasional WOT. I haven't been auto-xing or doing much aggressive backroads driving lately.

Ed
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Old 08-18-2004, 10:25 PM   #2
Scoobs2002
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GT42R Power!

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Ive seen that before and it was the plug and coil pack... needed to be replaced.

Might want to give that shot if its not too expensive to try...if that doesnt work.....I think you have to expect the worse case senario.



Scoobs
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Old 08-18-2004, 10:35 PM   #3
MINO
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Also, check the timing belt, cam gears, crank gear that they all are in spec. If you've over rev'd then yoor belt may have jumped a tooth.
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Old 08-18-2004, 11:22 PM   #4
edkwon
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Ok i just inspected the #4 spark plug area after talking to some ppl and found the whole coil pack/plug/cable thing that sits over the spark plug had popped out. I pushed it back in and the car ran fine, but there is a bolt thats supposed to hold it down and now its gone, i dont know how that came out but i'll have to replace it.

Ed
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Old 08-18-2004, 11:56 PM   #5
Battlewgn02
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I had the same exact thing right after I put on a lightened flywheel, thought it was that, turns out the dealership re-flashed the ECU, all good now. Are you still under warranty, and do you have any mod friendly dealers in your area? Might want to check it out.
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Old 08-19-2004, 04:54 PM   #6
WRXout
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i have this same problem, i have a cylinder 1 missfire 3 weeks straight once a week, and i have a cam seal leak, but i dunno what it could be
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Old 08-19-2004, 05:44 PM   #7
pfhlipwrx
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Aghhh...live with it, I have for the last 6 mnths...
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