Knocking noise right front area

showard8 · Apr 1st, 2013, 19:59

Hi all,

I've got a noise that's driving me mad, dealer says they can't hear it so no help there.

Its a 2009 xc70 2WD version with only 20K on it.

When going over speed bumps and the front suspension is loaded up / unloaded, there is a knocking noise that's audible, you can't feel it through the steering wheel, and the car drives beautifully straight.

I've been under that corner on the car several times now and can find nothing wrong, nor could the dealer.

I've done loads of searches on here but nothing fits the symptoms of what I have.

Can anyone point me on the right direction?

Its a knock/pop, when the front right corner is loaded/unloaded.

WillV70D5 · Apr 1st, 2013, 20:05

ARB drop link?

petfish666 · Apr 1st, 2013, 20:10

I went down the ARB link to no avail. Turned out to be lower control arm bush.

showard8 · Apr 1st, 2013, 20:12

Visually it looks ok, nothing snapped / broken etc, and the cars low mileage, any guidance how I could rule it out / test that part further?

showard8 · Apr 2nd, 2013, 20:28

Is it safe to remove the drop link(s) and take a drive to see if the noise stops?

WillV70D5 · Apr 2nd, 2013, 20:47

Quote:

Originally Posted by showard8

Is it safe to remove the drop link(s) and take a drive to see if the noise stops?

Yes but don't go ragging round too many corners

Although you may as well just change them as they're cheap and probably fooked anyway.

tommyweaves · Apr 2nd, 2013, 22:38

Doubt it would be drop link as that would rattle when you load/unload the opposite side as well - therefore I suspect it's something specifically independent on that side. Top mount loose? damaged shock absorber?

Is it a single pop/knock for each load/unload or a series of regular noises, like if you had a worn out CV joint knocking?

WillV70D5 · Apr 2nd, 2013, 23:59

Quote:

Originally Posted by tommyweaves

Doubt it would be drop link as that would rattle when you load/unload the opposite side as well - therefore I suspect it's something specifically independent on that side. Top mount loose? damaged shock absorber?

Is it a single pop/knock for each load/unload or a series of regular noises, like if you had a worn out CV joint knocking?

I don't think thats true. I think it COULD be the drop link. Definitely worth a look.

Also worth checking hub bolts are tight as that can produce odd knocks and clunks.

Gadgetman · Apr 3rd, 2013, 11:40

I had a similar problem on my S80 it turned out to be a sub frame bush

showard8 · Apr 3rd, 2013, 20:51

Thanks guys, its a knock per load/unload of the drivers side front suspension.

I called the place I got it from, they were fair enough and confirmed I should disconnect the drop links and see if the noise goes, they could then post me some arb drop links.

They said its unusual to get any real suspension issues on a car of 20K mileage.

I bought the car from Bridgend, which is an 8 hour round trip for me so i'm reluctant to 'pop over'.

I'll give it a go later this week and post back.

Apr 1st, 2013, 19:59	#1
showard8 New Member Last Online: Sep 24th, 2013 09:43 Join Date: Mar 2013 Location: Lincoln	Knocking noise right front area Hi all, I've got a noise that's driving me mad, dealer says they can't hear it so no help there. Its a 2009 xc70 2WD version with only 20K on it. When going over speed bumps and the front suspension is loaded up / unloaded, there is a knocking noise that's audible, you can't feel it through the steering wheel, and the car drives beautifully straight. I've been under that corner on the car several times now and can find nothing wrong, nor could the dealer. I've done loads of searches on here but nothing fits the symptoms of what I have. Can anyone point me on the right direction? Its a knock/pop, when the front right corner is loaded/unloaded.

Apr 1st, 2013, 20:05	#2
WillV70D5 Member Last Online: Sep 5th, 2013 12:39 Join Date: Nov 2012 Location: Hove	ARB drop link?

Apr 1st, 2013, 20:10	#3
petfish666 Junior Member Last Online: Sep 6th, 2014 14:56 Join Date: Aug 2011 Location: stoke-on-trent	I went down the ARB link to no avail. Turned out to be lower control arm bush.

Apr 1st, 2013, 20:12	#4
showard8 New Member Last Online: Sep 24th, 2013 09:43 Join Date: Mar 2013 Location: Lincoln	Visually it looks ok, nothing snapped / broken etc, and the cars low mileage, any guidance how I could rule it out / test that part further?

Apr 2nd, 2013, 20:28	#5
showard8 New Member Last Online: Sep 24th, 2013 09:43 Join Date: Mar 2013 Location: Lincoln	Is it safe to remove the drop link(s) and take a drive to see if the noise stops?

Apr 2nd, 2013, 22:38	#7
tommyweaves Premier Member Last Online: Apr 10th, 2024 19:55 Join Date: Sep 2010 Location: Sleaford	Doubt it would be drop link as that would rattle when you load/unload the opposite side as well - therefore I suspect it's something specifically independent on that side. Top mount loose? damaged shock absorber? Is it a single pop/knock for each load/unload or a series of regular noises, like if you had a worn out CV joint knocking?

Apr 3rd, 2013, 11:40	#9
Gadgetman Junior Member Last Online: Feb 14th, 2024 21:12 Join Date: May 2009 Location: Preston	I had a similar problem on my S80 it turned out to be a sub frame bush

Apr 3rd, 2013, 20:51	#10
showard8 New Member Last Online: Sep 24th, 2013 09:43 Join Date: Mar 2013 Location: Lincoln	Thanks guys, its a knock per load/unload of the drivers side front suspension. I called the place I got it from, they were fair enough and confirmed I should disconnect the drop links and see if the noise goes, they could then post me some arb drop links. They said its unusual to get any real suspension issues on a car of 20K mileage. I bought the car from Bridgend, which is an 8 hour round trip for me so i'm reluctant to 'pop over'. I'll give it a go later this week and post back.

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