Help us help you. By posting the year, make, model and engine near the beginning of your help request, followed by the symptoms (no start, high idle, misfire etc.) Along with any prevalent Diagnostic Trouble Codes, aka DTCs, other forum members will be able to help you get to a solution more quickly and easily!

2002 Subaru Impreza WRX 2.0L

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5 years 7 months ago #23345 by Pj
2002 Subaru Impreza WRX 2.0L was created by Pj
Runs rich, hesitates and stalls.

Maf has been replaced elsewhere plugs are new. A/F sensor new. It runs rich to the point you can see black smoke rolling out the tail pipe. It will run better with the A/F unplugged but not much.

What's getting me is the low engine vacuum. I thought it must be out of time so we pulled the cover off and it's not. It will hold fuel pressure so I don't have an injector leaking down or fuel pressure regulator.

He told me he did put in new injectors from where I have no clue.
P0172- Runs Rich
Fuel pressure - 46psi

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5 years 7 months ago #23353 by Chad
Replied by Chad on topic 2002 Subaru Impreza WRX 2.0L
What are your O2 sensors doing? Any activity, at all? Can you force them LEAN by creating a vacuum leak?
"Knowledge is a weapon. Arm yourself, well, before going to do battle."
"Understanding a question is half an answer."
I have learned more by being wrong, than I have by being right. :-)

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5 years 7 months ago #23354 by cheryl hartkorn
Replied by cheryl hartkorn on topic 2002 Subaru Impreza WRX 2.0L
whats the engine coolant temp reading??
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5 years 7 months ago #23355 by cheryl hartkorn
Replied by cheryl hartkorn on topic 2002 Subaru Impreza WRX 2.0L
also have you checked for a possible stuck open egr valve? or a stuck open purge valve?
The following user(s) said Thank You: Andy.MacFadyen

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5 years 7 months ago #23356 by Andy.MacFadyen
Replied by Andy.MacFadyen on topic 2002 Subaru Impreza WRX 2.0L
2002 WRX -hmm more than possible something non-standard has been done to the car somewhere along the line.
My first thought was a non-oem MAF or a cold air induction kit. I would also want know if the injectors were changed before or after problem first appeared.
What g/s is the maf showing at idle and 2000 RPM ?
" We're trying to plug a hole in the universe, what are you doing ?. "
(Walter Bishop Fringe TV show)

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5 years 7 months ago #23358 by Tyler
Replied by Tyler on topic 2002 Subaru Impreza WRX 2.0L
I replied to the TechHelp on iATN, too. Any improvement with the MAF disconnected?

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