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Old 12-05-2008, 02:52 AM   #1
STi-Nismo Dood
Scooby Specialist
Member#: 4149
Join Date: Feb 2001
Chapter/Region: SCIC
Location: Frisco/Diego/LosAngeles
MY93 Impreza 6MT
GC8.6 Aspen White

Default Car stumbles/bog woes during start-up

I first experienced this problem after my mechanic cleaned out the engine bay with a power wash. The problem seemed to go away or lessen after the throttle body was cleaned. Last weekend, I power steam washed my underbody and the problem came back again, big time. I try to step on the gas and gives me a feeling like it's building up pressure and going to blow up.

I have replaced the MAF sensor, and it still seems to bog once warming up to about 5-15 minutes of running depending on how it's driven.

My next intention is to replace the o2 sensor. Although I could not see how washing the car could ground the sensor... what do I know...

So far, I notice that this situation only happens during a change in engine temperature.
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Last edited by STi-Nismo Dood; 12-05-2008 at 10:56 AM.
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Old 12-05-2008, 03:02 PM   #2
Scooby Specialist
Member#: 80465
Join Date: Jan 2005
Chapter/Region: RMIC
Location: Bailey, CO
2001 2.5RS
Black Diamond Pearl


sounds like a wiring problem more than a sensor problem. extra water may add resistance in a circuit, causing your ecu to think somethings wrong and react to it. check all your wiring.
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