Guess that noise

Strange whining/squealing coming from under the bonnet. Only happens when the engine is warmed up and it comes and goes. Sounds to me as though it is some sort of valve/vacuum rather than any of the belts.

I've even put together a Youtube clip of it:

Mysterious squealing noise from Range Rover Classic - YouTube

Any ideas as to what this is would be appreciated and better still, how the hell do I stop it.

Cheers

Sounds like a vacuum noise for what I can hear. I take it you have checked all inlet manifold hoses. I would be toying with the idea of spraying a little WD on the pulley's to see if the noise goes away, if so it may be a bearing on the way out.

Musicmaker said:

Sounds like a vacuum noise for what I can hear. I take it you have checked all inlet manifold hoses. I would be toying with the idea of spraying a little WD on the pulley's to see if the noise goes away, if so it may be a bearing on the way out.

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Thanks for the suggestion. I will check the hoses tonight. Pretty sure it is not the pulleys, but will have another look

Ok, hoses seem fine but I have noticed that it only makes this noise when idling and in gear without touching the accelerator. For example when reverse parking and allowing the car to 'roll' backwards into the space (auto box remember) it makes the noise, but as soon as I touch the accelerator or put it in 'P' it stops.

Idle control valve perhaps?

Classicdriver said:

Ok, hoses seem fine but I have noticed that it only makes this noise when idling and in gear without touching the accelerator. For example when reverse parking and allowing the car to 'roll' backwards into the space (auto box remember) it makes the noise, but as soon as I touch the accelerator or put it in 'P' it stops.

Idle control valve perhaps?

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Any oil in the gearbox?

Alternators can make some very funny noises sometimes, if there is a problem with the coil windings.

Pete

Pete The Biker said:

Alternators can make some very funny noises sometimes, if there is a problem with the coil windings.

Pete

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+1 on that. Also the flex plate.