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Old 07-01-2014, 10:21 PM   #1
fenix-silver
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Member#: 231700
Join Date: Dec 2009
Chapter/Region: MAIC
Location: Central PA
Vehicle:
2004 WRX Wagon
WRB

Default Cylinder 3 misfire

Looking for some help on a P0303 Cylinder 3 misfire code. Engine is shaking fairly badly and I'm down on power. Car is 2004 stage 2 w/ catless UP, catted 3" DP, etc. ~90k miles (stage 2 since about 60k). Been running fine for quite awhile w/ no changes made recently.

Things I have tried:
1) replaced spark plug in cylinder 3
2) swapped coil packs between cylinders 1 & 3
3) compression test: cylinder 1 - 125, 2- 125, 3-117, 4-122
4) cleaned MAF, although I wouldn't have expected that to affect a single cylinder

Any thoughts on what my issue might be or what my next steps to diagnose would be?

Thanks in advance for the help!
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Old 07-01-2014, 11:59 PM   #2
Ianroberts
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Member#: 375333
Join Date: Dec 2013
Location: Novato, CA
Vehicle:
02 WRX
Black

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Sounds just like my car. Have a cylinder 3 misfire, I took it to LIC Motorsport (specialize in Subies) and they did a compression test and inspected my car.

They then told me my engine was bad and needs to be rebuilt or replaced. My car's mileage is at 162k. That was a while ago and I have yet to fix my problem. I have put roughly 3 or so thousand miles on it since.

It smokes and smells. But that is what happens when your head gasket is garbage. Oh and I check my oil religiously! It burns VERY fast.

So your problem seems very similar to mine. But my compression test was something like all the cylinders were close to 170 except cylinder 3 was at 125.

Hopefully my problem is not your problem!
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Old 07-02-2014, 07:59 AM   #3
quazimoto
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Location: Da-boonies,Va
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Old 07-02-2014, 09:37 AM   #4
fenix-silver
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Join Date: Dec 2009
Chapter/Region: MAIC
Location: Central PA
Vehicle:
2004 WRX Wagon
WRB

Default

Sorry, I did see that post, but unless I'm mistaken, most of the causes listed there that I haven't already checked would result in intermittent misfires or misfires for all cylinders. A few months ago I also cleaned my crank and camshaft angle sensors. Looks like my next step may be to swap around injectors and see if the misfire follows.

Is there a relatively simple way to test the coil pack wiring?
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Old 07-02-2014, 02:00 PM   #5
quazimoto
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Quote:
Originally Posted by fenix-silver View Post
Sorry, I did see that post, but unless I'm mistaken, most of the causes listed there that I haven't already checked would result in intermittent misfires or misfires for all cylinders.
You are mistaken. It has to do with any misfire situation. You can only check the primary side if the coil packs.
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Old 07-02-2014, 02:40 PM   #6
JerseyDubbin
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Vehicle:
2004 AW WRX Wagon
VF43, Opensource Tune

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I would look into a burnt valve too. Happened to my sisters Stage II 2003 WRX.

Mine had the same symptoms but I had two bad coil pack wires. I swapped those two and obviously my codes didn't' change so I brought it in and the shop determined it was two failed cables.
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Old 07-18-2014, 08:48 AM   #7
fenix-silver
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Location: Central PA
Vehicle:
2004 WRX Wagon
WRB

Default

Turns out it was a bad coil pack on cylinder 3, but the one on cylinder 1 arcs occasionally as well. Only replaced the bad one for now. Glad it was something simple.
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