Hi everyone am now to the sight as i have just bought a 2000 audi S3 engine code APY. The car was fine when i got it a month ago but since about 2 weeks ago i has been having problems boosting. Its fine driving normal but as soon as the turbo tries to kick in it feels like its trying to but but somethings stopping it, it just judders and doesn't go anywhere. My dump valve has started to chatter when letting off the throttle as well and also has started back firing now and then.
I have had it on Vag-com and it brought up the N75 valve what i have changed, the air flow sensor wat i have now changed and the N249 what has now been by passed, i also took off my forge p007 dump valve and fitted the standard one. I have unplugged the battery for about an hour or so to reset the ECU, put it back on Vag-com and no faults were coming up but i am still having the boost problems as i was before hand.
The car has a full through miltec exhaust with sports cats, K&N cone filter and a custom map, not sure on what map it is tho?
Any help would be appreciated.