Quote:
Originally Posted by MaineCedes
Harbinger of anything bad?
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Generalized answer: most likely not. Most turbos make some noise on a car of this age. Some more than others. It may be a sign of wear but turbo failures on these cars are much more infrequent than on gas engined cars.
There are two places where you might be getting some turbo whine from, the turbo inlet and the top part of the exhaust.
At the inlet is a C-shaped (or U-shaped, if you prefer) fat air intake hose that runs from the air cleaner assembly downward into the turbo inlet. It has a clamp on each end and should have a sealing ring inside, where it meets the turbo.
First check that this is securely in place. They have been known to pop off at the turbo inlet, which lets noise out. This will be doubly true if there is oil present around the inlet and/or the sealing ring has deteriorated or is missing.
You might also have a small exhaust leak. There is a flexible section (flex-pipe) where the exhaust downpipe bolts up that allows the engine to move about a bit. This can deteriorate and open a small hole. The downpipe 'hard' section itself doesn't last forever either.
If the connections are good and there isn't a hole in the exhaust, I would not worry about it.
If you have not inspected the air filter, now would be a good time to do it as well. If it looks dirty at all, replace it.