Can't figure out this KR at WOT

[Brian MS3]

I'm trying to do some 3rd gear pulls to start getting tuned but I keep getting KR. I have cleaned and tightened down couplers and new plugs gapped a .026 and I am still getting it. Any suggestions?

 

[nekret]

AFR seems pretty lean during those WOT events. Usually this suggests a leak between the turbo and the intake valves. Have you done a boost leak test?

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[nekret]

Oops sorry I'm brain farting... boost leak would cause a rich condition. Check for a leak after the maf and before the turbo. Some folks also have some luck cleaning the maf.

Another thought would be if you have an aftermarket maf housing, you will need to tune for that.

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