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View Full Version : 2001 b5 s4 wont hold boost consistently



Satans S4
06-17-2014, 11:47 AM
Hello everyone, first time poster, please be gentle.

I have a b5 s4 that has a bunch of goodies, however all pretty new still yet aren't working well.


The main issue is I can get to 15 lbs of boost with WOT in 3rd gear but to try and do it in 4th or even again after the first time, the boost only gets to 5lbs. It is steady -24 on idle or decel. No CEL lights or any other issues, except fluctuating at idle, which may or may not be correlated.

Anything that gets me closer to having this fixed and FINALLY having a smooth running, consistent working car would be greatly appreciated.

Satans S4
06-17-2014, 11:49 AM
I forgot to mention the waste-gates and DV are new as well as the MAF. Also the EGT have been coded out allegedly.