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Old 01-25-2005, 09:33 AM   #1
Xman23
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Location: Leesburg, VA, C.S.A.
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2004 WRX
Silver

Question Mystery CEL

I was on the way to work this morning and hitting it a bit hard during a stretch. Nothing major, I was logging at the time as I usually do. Boost never hit past 15.5. I could only run out 3rd gear before I pulled it out of gear and coasted to the red light ahead. Immediately after pulling the car out of gear
the CEL began flashing. No, it wasn't knock, a glance at my laptop said as much, so has the log after review. It wasn't knock type flashing anyway. A knock flash is a double and it's quick. This flash was on-off on-off on-off for about 15 seconds or so. I've never seen or even heard of anything like it. After the 15 seconds or so it went away.

Anyone know what this could be? Could I try to pull a code with an OBD2 if the CEL isn't on?

I'm guessing it was an ECU thrown CEL...but it didn't stay on...

'04 WRX
UTEC (Open loop fuel, closed boost)
Perrin intercooler hoses
Perrin short ram
Oil catch can
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Old 01-25-2005, 10:42 AM   #2
mbiker97
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It sounds like a misfire code. Go get it pulled from Autozone to find out exactly what it is. The ECU stores the codes until they are reset.
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Old 01-26-2005, 01:28 AM   #3
eastcoastbumps
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I second the misfire code. Do you have a lighter flywheel or pulley? These can cause misfire codes (not misfires, just a code). Check your timing belt too. My sister had a light fender bender with my WRX and the belt skipped a tooth or two and caused a misfire CEL. My brothers L has a misaligned timing belt and we have no idea how it got that way. It might be an aftermarket pos belt or the previous owners mechanic.

Pete
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Old 01-30-2005, 08:59 PM   #4
Xman23
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You were both right, the code(s) were stored.

P0302 - Cylinder #2 misfire
P0304 - Cylinder #4 misfire

I've got 24K miles so it's time for new plugs anyway. I'll replace those and go from there.
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Old 01-31-2005, 12:24 AM   #5
Uncle Scotty
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You may have a bit of a vac leak and/or an induction leak pre-turbo.
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Old 01-31-2005, 01:01 AM   #6
Xman23
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I'd be sincerely interested in your explanation of that diagnosis.
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Old 01-31-2005, 07:52 PM   #7
mistaboosta
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i had the exact same situation with you today. My CEL began flashing in a slow rate for 10 - 15 secs. Then it went off. I plugged in a OBD2 reader but it didn't show any CEL codes. That's weird.
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Old 01-31-2005, 09:09 PM   #8
Uncle Scotty
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Quote:
Originally Posted by Xman23
I'd be sincerely interested in your explanation of that diagnosis.

....leaning out because of a vac/induction leak(or because of a junk CAI) can cause misfires, and depending on where the leak is, which cylinders actually misfire.....2&4....same side....
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Old 02-01-2005, 07:06 PM   #9
mistaboosta
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i was watching for my AFRs during this happened and they were quiet normal.

4th gear 3100 rpm -5psi boost 13.9 AFR

I am constantly getting CEL because of a misfire in Cyl 1 error code
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Old 02-01-2005, 07:10 PM   #10
Uncle Scotty
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Quote:
Originally Posted by mistaboosta
i was watching for my AFRs during this happened and they were quiet normal.

4th gear 3100 rpm -5psi boost 13.9 AFR

I am constantly getting CEL because of a misfire in Cyl 1 error code

You may have a blown #1 cyl.....do a comp test...
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Old 02-02-2005, 06:12 PM   #11
mistaboosta
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i think i'm hearing some ticking / clicking coming from the cyl 1.

i'll be checking the injector, coils and the plug tomorrow. Hope this is not a big issue.

What things shall i observe to get a clue if the #1 cyl is blown or not?
The car runs great at WOT.
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Old 02-03-2005, 08:55 AM   #12
mbiker97
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Quote:
Originally Posted by mistaboosta
What things shall i observe to get a clue if the #1 cyl is blown or not?
Compression test is the easiest way.
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