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Knocking noise on coasting

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Old Jul 19th, 2013, 22:02   #1
dilksie
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Default Knocking noise on coasting

The missus came home in the XC90 today and informed me it has started making a knocking noise when she lifts off on the accelerator. I took the car out and sure enough when you lift off there is a tapping/knocking noise coming from the front end. Tried coasting in both drive and in neutral and the noise is there. Pressing the brake pedal stops the noise as does accelerating again. The noise sounds like it is linked to something rotating rather than just loose. I've checked the front brakes and they are fine, so am stuck to as what it could be. Any one experienced similar or have any ideas?
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Old Aug 1st, 2022, 15:29   #2
Balistaff
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Check your bolts are tight on your front wheels. Even an 1/8 of a turn tighter may resolve the problem. Quick & easy fix if so.
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Old Aug 3rd, 2022, 08:45   #3
john langrick
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I had similar with a cracked reluctor ring..
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Old Aug 8th, 2022, 10:48   #4
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Originally Posted by john langrick View Post
I had similar with a cracked reluctor ring..
John l
I fitted new reluctor rings a few thousand miles ago, when I had the ABS light come on (and had check the sensors and changed some of the sensors.

A few weeks ago I tightened my wheel bolts when I had the low speed knocking when coasting and it fixed the problem,….and now in Southern Bavaria, no problem.
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Old Aug 8th, 2022, 19:44   #5
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jack up each corner and spin each wheel in turn to see if you can narrow down the cause of the sound.
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Old Aug 8th, 2022, 19:56   #6
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Quote:
Originally Posted by Simmy View Post
jack up each corner and spin each wheel in turn to see if you can narrow down the cause of the sound.
And check the CV gaiters at the same time as well as looking for a stone caught between the disc and backing shield.

ROTF look at the OP posting date,

Last edited by SnineT; Aug 8th, 2022 at 20:47.
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