I got a 88 vert with s5 t2 swap .the people who did the swap used s4 harness ecu is n338 . Was running fine at one point n now been a headache now ut runs but secondarys do not open an the car boost 3-4 now was running 7-8 b4 . Changed maf nothing happened same issue checked timing ecu injectors everything so far was good . Used my friends t2 ecu maf and boost pressure sensor an nothin ..Any help would be appreciated

 

Stop driving the car immediately. N338 is an S4 convertible ECU, which despite rumors that it can double as a TII ECU, will not work. Fuel and timing will all be wrong, and it is not set up to interpret a positive pressure signal from a TII MAP sensor. If you have an NA (N32x) MAP sensor, it won't read boost at all.

If power has been affected, you need to compression test the engine. A blown engine is a definite possibility with mix-n-match ECU/sensors/engine.

 

late response but thanks put t2 ecu and maf its running a hell of a lot better but taking off regularly is kinda weird it feels as if its getting to much fuel or something but if you punch it she pulls hard and drives as if its fine im lost

 

Make sure the TPS Green/Red wire is set to 1 volt w/key to on and the car as hot as it can get (20 minute drive should do it).

 

This might help if its not the ecu... Rotary Resurrection home of the budget rebuild.