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Old 01-15-2013, 03:24 AM   #1
BugEyeOrBust
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Default Might be noobish (troubleshooting)

Okay, to start with the car...it's an 02 WRX wagon. Mods are simple, a custom cat-back, Cobb intake, and an HKS BOV venting to atmosphere. I hate the valve and am buying a new one shortly, but it's what came on the car.

Here's the issue:
My CEL is on, and it shows the codes for misfire in ALL 4 cylinders. I believe thats like 0301 0302 0303 0304 or something. Anyway, the light is solid and stays on for a week or so. Then, randomly, it will turn off. It will stay off for about 3-4 days, and then again, RANDOMLY, come on and blink this time letting me know that the car supposedly misfired. Then it will stay on for about a week and then repeat the cycle.

I've been over that BOV sticky a million times, and I thought initially that my VTA BOV was causing the problem, but after asking around I'm not so sure. Anyone have any ideas? The car drives fine. It does NOT sputter, stall, cut out, or anything. As for maintenance, the spark plugs were done about 4k miles ago, oil and every other fluid as well, and any normal maintenance was ALL done at that time. Literally everything lol.
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Last edited by BugEyeOrBust; 01-15-2013 at 10:53 PM. Reason: added mod
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Old 01-15-2013, 07:15 AM   #2
Loyale93
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How many miles on the car? Was the timing belt done?
I know you said "any normal maintenance was ALL done" but we get some idiots in here, so you never know.
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Old 01-15-2013, 09:53 AM   #3
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Do you have access to the freeze frame data for the DTCs? If the misfires are being set during the transition from cold engine to warm (around 130-150 deg F) and you cannot detect any appreciable skip, then a valve clearance check may be in order. Tight valves (or valves in spec, but on the skimpy end of spec) can cause misfire codes like that.
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Old 01-15-2013, 12:38 PM   #4
BugEyeOrBust
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Yes, the timing belt has been done. The car has 150k on it.

I want to say I've only seen the actual blinking light well after the car is warm, although I could be wrong. I'll have to do that valve check then, but roughly what would that cost if I had someone else do it? I'm mechanically inclined, but time may play a factor.

Thanks for the responses, and if anyone else has suggestions please let me know.
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Old 01-15-2013, 01:08 PM   #5
vision.dynamix
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Does the car have a lightweight flywheel or pulley?
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Old 01-15-2013, 01:37 PM   #6
BugEyeOrBust
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No. It has an Exedy stage 1 clutch (basically stock) and stock flywheel. As far as I know the only mods are the HKS BOV and the exhaust. There are suspension mods but that doesn't matter in this case.

Edit: Cobb intake as well.

Last edited by BugEyeOrBust; 01-15-2013 at 01:59 PM. Reason: mods
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Old 01-15-2013, 09:01 PM   #7
BugEyeOrBust
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Any other ideas? Bumping for more ideas before I start tearing it apart this weekend...
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Old 01-15-2013, 09:08 PM   #8
J-hop
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I read over your post a few times but didn't see it mentioned, did you have it tuned after the mods?
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Old 01-15-2013, 09:40 PM   #9
BugEyeOrBust
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I am not entirely sure if it's tuned or not, but chances are NO. I personally have not tuned it, and I bought the car with these mods. I'm trying to get it straightened out and I hate buying a modified car but the price was right.
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Old 01-16-2013, 01:10 PM   #10
ToneWrx02
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well the mods shouldnt be a issue since its a 02 wrx, the bov would just cause it too run rich bewteen shifts, when you say cobb intake do you mean turbo intake or filter and box?
Either way it shouldnt cause a problem, do you happen to have the stock intake box? put that on and give it a try. new Spark plugs? gap them right?

try running some seafoam to clean the injectors.

double check the spark plugs, check the condition of them, maybe the coils are bad. check all these things and then come back also what fuel are you putting?
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Old 01-16-2013, 01:23 PM   #11
BugEyeOrBust
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The intake replaced the filter and box. It's the short Cobb piece and a filter. I don't own any stock parts since the car came like this.

I'm running 91 from Shell lol. And I've asked around and it seems it may be the coils so I'm looking for some used ones. Spark plugs are good, but I could try the seafoam to clean the system out.

I just don't understand why I would get the misfire code for ALL 4 cylinders...unless ALL 4 coils went bad...does that even happen? lol

Last edited by BugEyeOrBust; 01-16-2013 at 01:46 PM. Reason: More info
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Old 01-16-2013, 02:37 PM   #12
Jack
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If your cats are plugged up, it will do exactly this. Has the up pipe been replaced or removed and beaten to hell to remove the crap inside? If not, there's your first place to work. My wife's outback had 2 plugged cats at about 50k miles and did exactly what your car is doing. Sounds like I did the same things you have to try to fix it. I gave up and brought it to the dealer. They fixed it under emissions warantee.
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Old 01-16-2013, 04:32 PM   #13
BugEyeOrBust
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Well damn. I'm a noob to Subaru so how hard is it to do myself? I've done Turbo swaps and stuff on my old mitsu so I think I can do it. Is there a thread on here of how to?

For the people suggesting coils, before I buy them, is it even plausible that they would all go bad at the same time and cause these CEL's? I told to a local performance guy and he said he'd start with the fuel since its all 4 cylinders.

Last edited by BugEyeOrBust; 01-16-2013 at 04:51 PM.
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