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Old 07-29-2011, 01:47 AM   #1
Scooby Newbie
Member#: 216924
Join Date: Jul 2009
Chapter/Region: SWIC
Location: Phoenix, AZ
2009 WRX STi

Default Diagnosing problems with A/F learning and logging

I had read recently in a post on this forum that A/F learning A-D numbers can be used to diagnose problems like air leaks in the intake/inlet system, and was wondering if this is actually the case. If so, what should I be looking for? I know I am currently having a problem (severe overboosting - about 4-5 psi above target), and have the following numbers for A/F learning: A - 7.5%; B - 7.4%; C - 0.5%; D - 0.0%.

Modifications (if they're helpful):
44mm Tial EWG
Intake (Typhoon-type)
TGV deletes
1000CC injectors
Samco inlet

An added note on current issues: I have an exhaust leak - enough that I do not feel exhaust flow out the rear pipes at this point (so a severe exhaust leak...or else my EWG is somehow stuck and diverting all flow to the dump tube). I also definitely have a vacuum or boost leak under the hood.

Any logging values that would be recommended for diagnosing a problem like this? I don't want to do a full throttle pull in the interest of keeping my engine safe, but if there is something I can do, I'm open to suggestions. If anyone has a guide for how to diagnose problems with the AP, it would be very helpful and appreciated.
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