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Old 08-15-2011, 08:44 AM   #25
Cobb Tuning
Member#: 4803
Join Date: Mar 2001
Location: Austin, TX

You have multiple correction to fine knock learning being applied at WOT. This is generally based on past knock, so there's some issue there. An occasional single correction is acceptable (ex. -1.4), but not when you have multiple corrections (ex. -4.2, -5.6) at high load.

Your A/F Learning at -10% is something you need to look at. You can also log A/F Correction 1 which will give you your short-term fuel trims. You might be able to see other patterns here in closed loop (at various loads) that has not been learned yet.

The -10% A/F Learning is giving you a clue that something is up with the fueling. I would get the pressure test/smoke test done to start.

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