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XC90 '02–'15 General Forum for the P2-platform XC90 model |
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The mysterious knockViews : 1082 Replies : 11Users Viewing This Thread : |
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May 10th, 2022, 21:36 | #1 |
Volvo XC90 T6 & XC90 D5
Last Online: Apr 27th, 2024 15:25
Join Date: Jul 2020
Location: Marple
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The mysterious knock
Hi all,
So I have finished my MOT work and the car is all back together and working great - the issue is that with the vibration gone from the steering rack track rod end I now have a knock. Having checked all the bushes ther is no apparent movement in any that is excessive. All the bushes are visably in good nick and the drop links/anti role bar looks in good shape too. Engine mounts look good also with the only one i'm unsure of being the rear engine mount - but it does look fine and there appears to be no vacume leak. Any suggestions / ideas on how to track down this knock? It's coming from the front drivers side btw. Nigel. |
May 10th, 2022, 21:44 | #2 |
VOC Member
Last Online: Yesterday 21:55
Join Date: Aug 2021
Location: Ashbourne
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If it’s a bobble like knock, it could be a loose brake pad.
Happened to me!🤔 |
May 11th, 2022, 06:23 | #3 |
The Brit Brick
Last Online: Aug 13th, 2023 09:39
Join Date: Jul 2021
Location: Warwickshire
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Get it in the air so the suspension is unloaded and check everything. You can't do it by eye.
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2005 C70 2.4T Collection convertible. 40,000 mile sunny day toy. |
May 11th, 2022, 10:13 | #4 |
Me ? Surely Not!
Last Online: Apr 25th, 2024 19:48
Join Date: Jul 2010
Location: 2007 Volvo XC90 D5 Geartronic. South of Hadrians Wall.
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When I had a similar noise on my XC90 I traced it to the strut top mount.
It's an easy enough DIY job but it's a heavy car so don't be tempted to use cheap bearing and rubber mount IF it is indeed this. I shopped around and manged to get genuine parts at a very good price. Quality aftermarket should also be fine but don't buy cheap rubbish as you will end up doing it twice.
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“Do the right thing. It will gratify some people and astonish the rest.” – Mark Twain 😊 2007 Volvo XC90 D5 SE Geartronic Last edited by S60D5-185; May 11th, 2022 at 11:01. |
May 11th, 2022, 17:11 | #5 |
Volvo XC90 T6 & XC90 D5
Last Online: Apr 27th, 2024 15:25
Join Date: Jul 2020
Location: Marple
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So it appears that the noise is related to accelleratrion and sounds like a dull hammer drill actrion so it suggests to me a ball joint? It cant be the steering rack arm/track rod as they are new.
I have alrteady iunspected the wheel jacked up with no load on iot and there is no movcement - having done the lower arm on a different XC90 I really dont fancy doing another as it wasnt hard but it was a faff. Any other thoughts? |
May 11th, 2022, 18:59 | #6 |
Petrolhead+Lots of Diesel
Last Online: Yesterday 16:29
Join Date: Aug 2008
Location: Glasgow
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Double check the rear bush on the lower front wishbone.
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BMW X3 Msport MHEV 2020MY & VW Beetle Design 1.2Tsi DSG 2014MY Previous XC90 D5 SELux Geartronic 2009MY |
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May 19th, 2022, 18:41 | #7 |
Volvo XC90 T6 & XC90 D5
Last Online: Apr 27th, 2024 15:25
Join Date: Jul 2020
Location: Marple
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I have checked all the suspension components and cannot find a reason for this knock/vibration.
However, I am suspicious of the right engine mount underneath the crankshaft the end of the engine. It looks very deteriorated and is in the region of the vibration. Just to clarify the sound, it’s a knock/vibration – knock over bumps vibration on acceleration only. In manual gears it does the same as it does in auto. If I hold it in second gear and Accellerate I still get the vibration removing, in my mind, any gearbox related issues. I’ve ordered a new engine mount regardless as it does look knackered and I will change and see whether this fixes the problem. I’m hopeful this will be the case |
May 20th, 2022, 19:43 | #8 | |
Member
Last Online: May 2nd, 2024 22:31
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Location: Hockley Tamworth
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Quote:
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Cheers, Chas. 2010 XC90 200ps 2.4 D5 SE Auto ,1971 Rover 3500 auto. |
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May 20th, 2022, 20:42 | #9 |
Petrolhead+Lots of Diesel
Last Online: Yesterday 16:29
Join Date: Aug 2008
Location: Glasgow
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When you rebuilt the suspension did you replace the bolts or reuse?
Stretched bolts can also give unusual knocks etc ... just another to add to the list.
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BMW X3 Msport MHEV 2020MY & VW Beetle Design 1.2Tsi DSG 2014MY Previous XC90 D5 SELux Geartronic 2009MY |
May 24th, 2022, 21:39 | #10 |
Volvo XC90 T6 & XC90 D5
Last Online: Apr 27th, 2024 15:25
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