M0onsh1ne
Registered User
Hi all,
Im new to this forum so apologies if im posting in the wrong place.
I've been having an ongoing issue for a good few weeks now with my 1.8t A3 AUM it would appear as though its making very little boost. Its like the car is in LIMP mode and constantly stays there, however If im stand still in traffic for say 10 minutes and the engine bay is getting really heated (not overheating) just getting hot, when i pull away the car runs perfectly and boosts correctly for about 20 seconds and then hits the flat spot again and stays that way. Also if i go on a run and turn the car off for 5 minutes so that its sat there heating up again, when i start the car and drive for the first 20-30 seconds or so the car performs as it should and then goes LIMP.
Things I have tried.
checked for boost leaks - upper Y crank case breather slight tear but now resolved, smoke test peformed cannot see any visible leaks.
Unplugged the MAF sensor and ran the car - no difference
Unplugged the N75 valve seperately to the MAF - no difference
Removed the boost pipe from ther N75 to the Actuator and tested the car - That feels a little better but no where near what it should be still LIMP
Tested the Stock D.v and this hold vaccum.
Connected a pump to the wastegate Actuator nipple and pressurised to se the wastegate ARM moves freely. this is a little stiff but it does open and close. However when starting the car and giving it a tiny bit of throttle the arm does not move at all. not even a little bit, is this normal?
Changed spark plugs
Tested coil packs and all are working.
I have scanned the car using a VAG-COM and the Torque app and there is absolutely NO CODES.
The thing that is bugging me is the car works for seconds at a time after it has been sitting there getting really warm at idle, so im thinking the heat building up in ther engine bay is sparking something into life for a few seconds..
Also sorry when i first start the car it really struggles to turn over, then as i try to pull away its almost stalling... this is only from cold starts though.
My car is standard with bolt on mods.
3' down pipe straight through to a ****** sports exhaust
2.0t coild packs with spacers
Creation motorsport TIP
N249 bypass with EGR valve removal.
did have an induction kit tot he front air vent but since this problem i have taken it off as its easier to work with the car so it just has a filter to the MAF at present
I would appreciate any help or advice given i have absolutely no idea what it could be
Thanks Aaron
Apologies If i have posted this thread wrongly some how hehe
Im new to this forum so apologies if im posting in the wrong place.
I've been having an ongoing issue for a good few weeks now with my 1.8t A3 AUM it would appear as though its making very little boost. Its like the car is in LIMP mode and constantly stays there, however If im stand still in traffic for say 10 minutes and the engine bay is getting really heated (not overheating) just getting hot, when i pull away the car runs perfectly and boosts correctly for about 20 seconds and then hits the flat spot again and stays that way. Also if i go on a run and turn the car off for 5 minutes so that its sat there heating up again, when i start the car and drive for the first 20-30 seconds or so the car performs as it should and then goes LIMP.
Things I have tried.
checked for boost leaks - upper Y crank case breather slight tear but now resolved, smoke test peformed cannot see any visible leaks.
Unplugged the MAF sensor and ran the car - no difference
Unplugged the N75 valve seperately to the MAF - no difference
Removed the boost pipe from ther N75 to the Actuator and tested the car - That feels a little better but no where near what it should be still LIMP
Tested the Stock D.v and this hold vaccum.
Connected a pump to the wastegate Actuator nipple and pressurised to se the wastegate ARM moves freely. this is a little stiff but it does open and close. However when starting the car and giving it a tiny bit of throttle the arm does not move at all. not even a little bit, is this normal?
Changed spark plugs
Tested coil packs and all are working.
I have scanned the car using a VAG-COM and the Torque app and there is absolutely NO CODES.
The thing that is bugging me is the car works for seconds at a time after it has been sitting there getting really warm at idle, so im thinking the heat building up in ther engine bay is sparking something into life for a few seconds..
Also sorry when i first start the car it really struggles to turn over, then as i try to pull away its almost stalling... this is only from cold starts though.
My car is standard with bolt on mods.
3' down pipe straight through to a ****** sports exhaust
2.0t coild packs with spacers
Creation motorsport TIP
N249 bypass with EGR valve removal.
did have an induction kit tot he front air vent but since this problem i have taken it off as its easier to work with the car so it just has a filter to the MAF at present
I would appreciate any help or advice given i have absolutely no idea what it could be
Thanks Aaron
Apologies If i have posted this thread wrongly some how hehe