jmackisback
15+ Year Contributor
- 52
- 1
- May 14, 2004
-
Richmond,
B.C._Canada
I recently took my bone stock 1991 TSi and added a handful of items such as FMIC, 255 pump, wideband o2, turbo back exhaust, intake, MBC @12 psi, boost gauge and SAFC. For some reason when I hit around 6k rpms the car will backfire and hit a wall....no boost leaks, but it does spike to 15-16 psi occasionally at WOT. What could be causing this? the AF ratios seem appropriate unless I am not noticing a split second change. The car pulls hard until that point.