Car is running rich.

Bighern9999

Bighern9999

Greenie N00B Member
Greenie Member
I've been restoring this 2006 MS6 that I have gotten earlier this year. Poor thing has been neglected over the years and MS6 I have always wanted to own one my whole life. My STFT and LTFT on my sensors were stuck at -.16. So I finally got the funds to replace the O2 sensors and now my dilemma. I have ran the car for about 200 miles and the numbers are everywhere for STFT and LTFT. Log is provide below. One log is on idle Data log 55 and the other is during a run datalog 54. I believe I may a vacuum leak or some leak which is driving it to go rich.

Repairs completed- Up and down stream O2 sensors replaced.
New and gapped spark plugs.
Bypass vent tube replaced.
MAF Cleaned.
Turbo Canister replaced KO4
HPFP internals upgraded and HPFP cleaned and resealed.
Purge relief valve replaced with OEM.
Cobb Access port tune
 

Attachments

need to check entire intake tract and exhaust for leaks
 
I checked all clamps and hoses and there is no visible leaks. I spray water on the hoses for any possible changes in idle. Didn't find anything.
 
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