So today I finally finished my k04 install on an 01 Audi a4 1.8T. Installed the GIAC tune with new injectors and 3" MAF. Started right up and runs fine. Boost is a little lower than expected but I think thats from the spring in the DV. However, my check engine light is on which I need to get scanned. But also the ABS light and Electronic Stablility Program light is on. Anyone have any idea as to what that could be?

 

Hmmm...might have the check the codes first. I'm taking a shot in the dark and saying it has something to do with the GIAC tune you have...not saying its bad or anything, but that's certainly a possibility. When you say that your boost is lower than expected, what psi are you peaking and settling at?

 

boost peaks around 14 lbs and holds for awhile then will drop to 10-12. had the cel scanned and it came back as the maf leaking air and then was told it was running rich/lean..forget which one. installed a high flow cat and having the same problems

 

Boost leak? Bad front O2 sensor?

 

don't think I have a boost leak, however had the ecu scanned again. Still have a leaking MAF. Went over my intake still same problem. Also threw a code for bank 1 so im assuming my front o2 sensor went bad.