new turbo noise-what's broken/fallen off

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frankie
Posts: 23
Joined: 24 Nov 2002, 22:16

new turbo noise-what's broken/fallen off

Unread post by frankie »

My turbo has started making a new noise, a bit like an electric razor at 3000 rpm and upwards, especially under hard acceleration. I haven’t noticed any air leaks or any drop in performance and the noise is still not very intrusive.
Any ideas what the prognosis is? (& how much).
Cheers
Frankie
Xantia SX TD 1995 96000m
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AndersDK
Posts: 6060
Joined: 21 Feb 2003, 04:56
x 1

Unread post by AndersDK »

A pinhole in the exhaust - or the manifold gasket.
Dave Burns
Posts: 1915
Joined: 14 May 2001, 05:30
x 2

Unread post by Dave Burns »

Have a good look for air leaks in the ducting between the turbo, intercooler and manifold, sounds to me like you are describing a charge air leak rather than something on the exhaust side.
If not a leak of any kind then it could be a damaged compressor wheel or a build up of carbon on the exhaust turbine contacting the housing.
A damaged turbine often makes a warbling sound like a ref's whistle, easily heard in the exhaust, caused by a broken or burnt away vane.
Dave
mbunting
Posts: 712
Joined: 21 Dec 2001, 15:19

Unread post by mbunting »

There could also be oil starvation of the turbo..
I had a similar sound once, sounded like an air-raid siren starting up. I pulled over, stuck some more oil in, and it went away !