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Old 11-01-2019, 12:23 PM   #1
Scooby Newbie
Member#: 507940
Join Date: Nov 2019
Chapter/Region: MWSOC
Location: WI
2002 wrx

Default Lean afr/bad idle, cant figure out why.

I just bought my wrx last Saturday and ive been having an issue that I cant seem to figure out.

At idle my afr gauge (passport) reads an afr of 17 and the idle sounds lopey. Car is running a OTS stage 2 tune from cobb and has a bigger tmic, catted downpipe, stock bov, stock intake.

When I unplug the MAF the idle goes back to 14.7. I bought a new denso MAF and that did not fix my issue.

I tried checking everywhere for vacuum leaks and I cant seem to find any. There is also a CEL for a misfire on all 4 cyls and fuel system lean.

Once the car is moving everything is normal, afrs read between 13 and 15 cruising.

Any ideas? I'm at a loss.
Car is a 2002 with 132k
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