Prado noise while moving but not under accelaration

Submitted: Thursday, Jul 05, 2007 at 22:35
ThreadID: 47436 Views:9204 Replies:6 FollowUps:10
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Hi All.

I have a 2000 GXL 3.4 Petrol Prado with 105,000 kms on the clock and it has recently developed an annoying noise that is hard to describe but close to an intermittent whiny squeel.

The noise is only detectable when the vehicle is traveling at 60km/h and not under acceleration. Easiest way to replicate is when accelerating up to the speed limit and then coasting once that speed is reached.

The appearance of the noise is completely random with the only time it has never occurred is first thing in the morning. It has even completely vanished for periods of up to 4 days but then returns.

To date I have greased all greasable joints in the drive train as this was my initial suspicion. Have also removed and replaced the 3 belts under the bonnet and checked that the noise wasnt coming from air con, power steering, alternator or the idle tensioner pulley for the air con.

As I havent yet reached the 150k service, the timing belt is yet to be replaced but I am curious to know if it could be one of the pulley bearings that tension that belt?

Any other Ideas on this problem as it is driving me nuts!!!

Thanks all in advance.

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