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Have noticed this recently. It's usually at around just under 3k rpm, I lift off the throttle and there's a chirping type sound. It sounds more like air than something mechanical. I'd say it was coming from the turbo/wastegate area. I did try to record the noise but couldn't get any clear recordings. Was thinking wastegate but thought I'd get some pointers before randomly changing things.
Have noticed this recently. It's usually at around just under 3k rpm, I lift off the throttle and there's a chirping type sound. It sounds more like air than something mechanical. I'd say it was coming from the turbo/wastegate area. I did try to record the noise but couldn't get any clear recordings. Was thinking wastegate but thought I'd get some pointers before randomly changing things.
I'd check if DV diaphragm isn't split. Few years back when I was driving my S4 home I had the noise and ended up being DV.
'93 Audi 100 Avant - R.I.P
'92 Audi UrS4 Avant - SOLD
'93 Audi UrS4 Avant
'15 Audi A7 quattro 3.0 TDI
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Thanks for the tips, the diverter valve is actually the one thing I have changed so far as I had a spare lying around. There's a chance they are both duff but for the noise to be exactly the same seems unlikely. Sorry for not mentioning this before.
I thought I'd check the BOV again as lightening can strike twice. So swapped in another spare and this has cured the noise! Thanks for the suggestions. I really must start throwing away obviously broken parts!!
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