Hello,
(please excuse any spelling or grammer mistakes as English isn't my first language)
I've been batteling a weird boost problem on my Audi A3 with AGU engine. Ive been trying to figure it out for some time and have posted on a dutch forum but can't get to the root of the problem yet.
The engine is stock except for a remap. The car runs, starts and drives absolutely fine, no issues at all except for the sudden loss of about 40hp. My max boost pressure dropped from 20psi to a constant 11psi. where I used to get a lot of power at around 2500rpm it is now completely flat. It just holds at 11psi. At 11 psi N75 is triggered to open the wastegate and hold it as I tried it without the actuator line and it is able to make more than decent boost.
Has my ECU lost it's tune??
What i've done untill now:
- vagcom: no fault codes
- pressure tested hoses (holds pressure no leaks.)
- Replaced N75
- Replaced Diverter valve
- Replaced throttle housing
- checked pcv system for leakes and replaced valve, hockeypuck seems fine
- If I take of the acurator hose to the N75 and (carfully) test it, it boosts without problems to 20+ psi
- If I disconnect N75 Boost droppes to 6psi
- Disconnecting MAF makes car slower
What else is there to check? Has anyone ever had a busted MAF while the car is running fine except for power loss? Has anyone ever had an ECU that lost it's tune?
Thanks in advance. I hope this forum is able to help me with this problem
(please excuse any spelling or grammer mistakes as English isn't my first language)
I've been batteling a weird boost problem on my Audi A3 with AGU engine. Ive been trying to figure it out for some time and have posted on a dutch forum but can't get to the root of the problem yet.
The engine is stock except for a remap. The car runs, starts and drives absolutely fine, no issues at all except for the sudden loss of about 40hp. My max boost pressure dropped from 20psi to a constant 11psi. where I used to get a lot of power at around 2500rpm it is now completely flat. It just holds at 11psi. At 11 psi N75 is triggered to open the wastegate and hold it as I tried it without the actuator line and it is able to make more than decent boost.
Has my ECU lost it's tune??
What i've done untill now:
- vagcom: no fault codes
- pressure tested hoses (holds pressure no leaks.)
- Replaced N75
- Replaced Diverter valve
- Replaced throttle housing
- checked pcv system for leakes and replaced valve, hockeypuck seems fine
- If I take of the acurator hose to the N75 and (carfully) test it, it boosts without problems to 20+ psi
- If I disconnect N75 Boost droppes to 6psi
- Disconnecting MAF makes car slower
What else is there to check? Has anyone ever had a busted MAF while the car is running fine except for power loss? Has anyone ever had an ECU that lost it's tune?
Thanks in advance. I hope this forum is able to help me with this problem