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Hi guys

 

Just started my LS400 MK4 1999 and it now makes an extremely loud whining noise. This occurred quite randomly as it was not making noise the other day.

 

Any ideas what it could be?

The noise gets worse as the RPMs increase and the pitch gets higher. Power steering seems to be working fine and have not had battery issues as of yet.

 

 

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Hi

It could be the drive belt and the idle pulley.

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I was just thinking, when I had an Ls400 it was making a whining noise and it turned out to be the alternator 

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Maybe one of your pulleys is at fault. E.g.  Does it stop if you switch air con off?

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Noise doesn't stop when I turn ac off.. I thought it was alternator but it seems to be coming from the opposite side (driver side engine bay area). Aircon works well so don't think it's the compressor.

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It might be the water pump and if it is you could lose your cambelt if it seizes,take off the serpentine belt and if the noise stops it could be any of the ancillaries or tension pulleys.

If it is still whining then your water pump is failing This happened to me many moons ago on my Mark 1.

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Waterpump is new.... Gates brand. I will check out the pulleys and see

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Take off the belt anyway that way you can identify weather it is the cambelt tensioners or the ancillaries

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on a lighter note ................  does it only happen when you have a front seat passenger :biggrin:

Malc

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1 hour ago, Malc said:

on a lighter note ................  does it only happen when you have a front seat passenger :biggrin:

Malc

Luckily not, that would be a difficult one to solve..;)

 

In other news it turns out it was low on power steering fluid. Topped it up with atf fluid and flushed it through a fee times and it's quiet now. I need to find out where it has leaked out from which is the hard part.

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