04 sti running rich and misfire - Subaru WRX Forum
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post #1 of 4 Old 04-14-2011, 05:42 PM Thread Starter
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04 sti running rich and misfire

I am posting this for my buddy. It is a 04 STI with 75k on it. Has short ram intake, turbo back, fmic, vented bov ( yes i know this is bad but he wont listen). Cobb stage 2 sti tune.
It runs very rough and very rich and throws code for missfire in cyl # 1, 2, 4. Any ideas as to what it could be he tried switching back to stock map, and resetting ecu. No luck.
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post #2 of 4 Old 04-14-2011, 06:06 PM
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Boost leak. Check the BOV first. That would be my first guess anyway.

2nd Guess, A/F Sensor (Front O2 sensor)

3rd Guess, bad ringlands (easiest to check by seeing if it puffs smoke out the oil filler cap when it's warmed up)

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post #3 of 4 Old 04-14-2011, 10:14 PM
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Swap the BOV from your car and see if that fixes it.

2005 WRX Cobb Stage 2
2009 Outback
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post #4 of 4 Old 04-14-2011, 10:26 PM
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How about stop trying to run parts that the OTS map is not made for? IE...FMIC, short ram intake (unless its Cobb's), and a BOV.

378awhp/373wtq Custom Dom 3 & CBRD tuned 2006 STI.
"When in doubt...flat out" - Colin McRae
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