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.
Quote:
Originally Posted by NicMonte
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
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I checked the IACV already, thing looks brand new. Ill look in to the fuel pressure regulator.