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Old 10-05-2012, 02:23 AM   #17
Scooby Newbie
Member#: 330568
Join Date: Aug 2012
Chapter/Region: MWSOC
Location: Upper peninsula mi
05 Wrx


Originally Posted by TwoFifty
Who is diagnosing that your o2 sensor is bad? Is anyone diagnosing it, are you just replacing it because you think that's the problem? Maybe you have corrosion in your connector, maybe you have bad wiring, maybe you have a bad ecu. Don't throw parts at the vehicle, diagnose it properly and fix it right the first time.

Do a boost leak test, fix and leaks you have, replace that BOV with the factory BPV and then see if your boost is still fluttering.

My car flutters in vacuum when just touching the gas but holds steady when at idle or when applying more throttle, I think it's something to do with how the gauge is plumbed in.... could be wrong here though.

Re do your compression test just to be sure.
I know that o2 was dead because as soon as ecu was reset cel came on for upstream o2. My mechanic and auto parts store got same code after each reset.

So I replaced it. I had no flutter before that because it wasnt reading properly and ecu was guessing. I replaced it with non oem o2 and computer started reading it. As soon as I replaced it flutter started at real low throttle like you have. I got suggestion earlier if you read entire thread from a third person with this issue and he suggested unplugging MAF. I did. And flutter is solved.

Replacing o2 because it could be bad... For $10 more i could have had oem denso and for $200 they should have told me..

I will replace o2 and if problem persists ill look at MAF.

All I know is until ecu kicks on car runs great.

Could easily be bad tune or bad ecu. How do I diagnose these?
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