High pitch noise when accelerating.

[kaiser]

Originally Posted by kaiser

Vacuum is highest with a closed throttle. That is the exact opposite of acceleration. Unlikely to be that! in my view.
I would rather guess alternator!

I see the OP has a Diesel. Then the vacuum theory is certainly out, as it has no throttle!

[planenut]

Originally Posted by kaiser

Vacuum is highest with a closed throttle. That is the exact opposite of acceleration. Unlikely to be that! in my view.
I would rather guess alternator!

A head under the bonnet can tell a lot.

[Mike Noc]

Originally Posted by peelaaa

Hi.
There is a strange noise that tends to be most noticeable when engine is cold. Like a high pitch noise.
It happens when accelerating, even just a slight push on pedal can make it happen. Easing off pedal and it goes away. But it doesn't always happen either.
Seems to be less noticeable when engine warmed through.
Clutch is engaging normally.

What would you think it is?

If it is a sort of whistling noise then you may have a leak somewhere on the inlet side after the turbo charger. Check the air hoses into the inlet manifold for leaks, and the manifold itself - not unknown for them to leak at the sealed joints.

[kaiser]

Originally Posted by planenut

A head under the bonnet can tell a lot.

Hope you run really fast!!
But otherwise I agree. If it occurs only on acceleration, it might be a bit challenging!!

[roverbarmy]

Boost pipe split or leaking?

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