View Full Version : Overboosting on a stock A4

05-17-2007, 07:05 AM
1999 1.8 A4 Tip - Stock
I'm seeing boost up to 10psi at which time the car will jerk/hesitate/something like the ECU is taking over and restricting spark or fuel. This is not a boost spike either as it can hold it there. What can cause overboost on a stock setup? Am I correct in thinking the jerking is the ECU cutting the engine off at 10psi or is this something else? [headbang] Thanks.

05-17-2007, 07:17 AM
Correct. The non-DBW cars will have a hard fuel cut around 10PSI. Check for hoses broken or disconnected near your turbo and turbo-intake-pipe. Sounds like the wastegate is not opening.

ice cream man
05-17-2007, 02:48 PM
could just be a boost leak, my car did the same exact thing, it was a leak. You can do a boost leak test or hook it up to a vag com.

05-25-2007, 08:13 AM
Found the problem - the line from the compressor to the N75 was torn down by the banjo bolt. All is well again.