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Old 11-01-2019, 03:51 PM   #5
Scooby Newbie
Member#: 507940
Join Date: Nov 2019
Chapter/Region: MWSOC
Location: WI
2002 wrx


Just went and reset the ECU and went for a spirited drive. No dice, still idles lean. And yes it is a "prosport" afr, my bad lol.

Originally Posted by NicMonte View Post
After my Jdm swap on an 02wrx I had very similar issues.

I replaced front o2, maf. Fuel filter.(none worked)

Replaced injectors and fuel pressure regulator. This fixed the issue. I had the same symptoms. Also I would check your IACV this might be the issue for the looping idle(possibly).
Although, a boost leak could create similar symptoms.
Hope this helps
I checked the IACV already, thing looks brand new. Ill look in to the fuel pressure regulator.
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