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Old 06-12-2013, 10:41 AM   #11
Scooby Newbie
Member#: 172977
Join Date: Feb 2008
Location: Northern California
2006 WRX TR


I hooked up a vacuum gauge to where the evap line goes into the cylinder 1 runner and vacuum held steady at 18inHg so I don't think it's an intake manifold leak.

Just for kicks, I pulled the TPS connector to force the car into open loop. With the AP I monitored the roughness, and in open loop there was absolutely no roughness. In closed loop the roughness would consistently count at idle. Since open loop ran smoothly, I can rule out the following: injectors, spark plugs, compression.

I'm left with either a bad sensor or an exhaust leak before the front O2 sensor?

How do I test the MAF/Front O2 before spending $$ on the parts?

Anyways, I have a fuel filter coming because it's long over due (went to the dealership and they said the fuel filter isn't a serviceable item so I never changed it). Maybe this will help....
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Last edited by BlueSubeDude; 06-13-2013 at 02:06 AM.
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