1997 A4 1.9 Tdi Quattro - turbo noise
Hi folks - Looking for some help. I have only had the A4 Tdi quattro for about three months even though it is 6 years old. Only has 49,000 miles on it, but in the rev band 1500-2500rpm in every gear whether engine hot or cold there is a very apparent turbo noise which concerns me. I have driven other Tdi cars of the same year, both 2 and 4 wheel drive, and their turbo sound is very slight and hardly noticeable. I took it to my Audi dealer, they agreed there is a noise and checked out the impeller shaft for imbalance, it was OK. An independant guy at an ECU remapping place thought it might be the EGR valve, but clamping the pipe to stop flow made no difference to the spinning/grinding noise. He tinks is may be rpm harmonic dependant and said I should go back to the dealer. The noise stops once I accelerate through the 2500rpm turbo range into the power range of the engine. Anybody else hear this on their car at all?