A4 1.8t boost issue - changes with N75 valve
#1
A4 1.8t boost issue - changes with N75 valve
My car is stock and when I bought it the car did not feel like it boosted.
I changed the N75 valve to one I bought of Ebay and the car did boost and was very fast but I started getting boost overpressure codes.
So thinking the problem could be with the EBay N75 valve I bought a valve from the dealer and I'm back to feeling like I have no boost.
So basically with the Ebay valve it will overboost and with the genuine Audi valve It feels like no boost.
I have removed the cat and checked that the wastegate valve is intact. The car has no codes unless I put in the Ebay N75 valve in which case I get boost overpressure codes. It did previously have a code for low cat efficiency but I put on a new aftermarket cat which fixed that.
I have vcds but I don't have a boost gauge.
The car is a 1999 A4 1.8t Quattro with 160K miles auto. No other problems from the engine.
Any ideas on where to start looking at this problem?
Thanks,
Andrew
I changed the N75 valve to one I bought of Ebay and the car did boost and was very fast but I started getting boost overpressure codes.
So thinking the problem could be with the EBay N75 valve I bought a valve from the dealer and I'm back to feeling like I have no boost.
So basically with the Ebay valve it will overboost and with the genuine Audi valve It feels like no boost.
I have removed the cat and checked that the wastegate valve is intact. The car has no codes unless I put in the Ebay N75 valve in which case I get boost overpressure codes. It did previously have a code for low cat efficiency but I put on a new aftermarket cat which fixed that.
I have vcds but I don't have a boost gauge.
The car is a 1999 A4 1.8t Quattro with 160K miles auto. No other problems from the engine.
Any ideas on where to start looking at this problem?
Thanks,
Andrew
Last edited by andrewwm; 07-09-2013 at 09:35 PM.
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