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Old 06-02-2011, 09:22 AM   #1
Scooby Specialist
Member#: 223894
Join Date: Sep 2009
Chapter/Region: TXIC
Location: Sugaru Land
Default NA timing / fuelling and exhaust alteration

Kind of a mish mash of ideas here. This might be the wrong thread. I was doing the 60k miles service on my Impreza 2.5i and figured that while I had the car up, I'd go ahead and free up my exhaust. I disabled a few codes (P0420 and the likes) and figured that was good enough.

The car is idling really rough now. I looked at the LV and even with an IAM of 0.5, it's still pulling timing in some places. Is this a timing issue? It's seems unlikely, but . Could it be bad gas? In Houston, that's the norm, not the exception. Just kind of odd that it would happen immediately after the service/mod. How much does the freer flowing exhaust alter the fuelling? Fuel trims are within 5% across the board, so I'm not sure how much it could have changed it. Any expert NA theories out there? If you alter the exhaust, what could cause knock to increase?
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Old 06-02-2011, 03:51 PM   #2
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Member#: 70395
Join Date: Sep 2004
Chapter/Region: MAIC
Location: Da-boonies,Va

Could be something loose maybe? Did you replace the whole exhaust ( header back)? Leak by the front O2 sensor? Try resetting the ECU by removing the neg battery cable and holding the brake pedal down for about 30 sec to dissipate the capacitance. I have seen weird thing happen after a reflash then a ECU reset clears it for some reason.
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