I know, I know yet another question about N75 valves...... I am sorry
My 1.8T (AGU) has been remapped and before map it ran fine and now after map it dumps all boost at around 5300rpm, this is only in third (not had a long enough stretch of road to try it in 4th) not in 1st or 2nd.
I have changed the MAF, changed the DV to a forge 007p (with yellow spring).
I stuck a fault scanner on it and the code that came up was 00575, Intake manifold pressure, sporadic - resulting limit not reached.
I have done a search through the forum (before you tell me off) and I think it all points to the N75 valve, is their a method of diagnosing whether its knackered or not without buying a new one?
Also I have not done the N249 bypass, would this affect the problem?
Thanks Guys, sorry to be a pain