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Resonating noise when decelerating.

noise decelerating

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#1 edihans

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Posted 21 February 2012 - 06:49 PM

Hello all,
Wondered if anybody can has come across this:

My car is a 2002, 1.8 petrol with 130k miles. When decelerating, the car makes a loud resonating noise. Like a woodpecker in overdrive! It only happens when decelerating and the noise is less loud when pushing the clutch.

I had the car booked in today for ECR problems and I had hoped that this noise was related to it but the mechanic said that it has probably something to do with the drive shaft instead. It's a fairly loud noise but no physical vibrations. It shows only when decelerating and much louder with the clutch de-engaged (pedal not pushed) then when freewheeling (pedal pushed). Frequency is linear with vehicle speed.The noise is not there when driving constant speed, accelerating or standing stationary.

I had initially posted this thread in the Engine forum but since it now seems drivetrain related I am posting it here.

Anybody any thoughts as what could be causing this?

Thanks,
- Hans.

#2 siruncle

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Posted 21 February 2012 - 07:27 PM

could try spinning the wheel with it off the ground, see if its doing it then, it might assist with diagnosis. could be a driveshaft gone, cv joint etc...
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#3 Baldrick

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Posted 21 February 2012 - 10:31 PM

Thrust bearing on the way out maybe, but would like to think you would hear it when they car was stood and the pedal not pressed if it was.




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