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Knocking noise, Im at my wits end - please help

Posted: Tue Feb 16, 2016 9:27 am
by Dirty Boy
I would appreciate any suggestion here, this is driving myself and the mechanic to murder.

The vehicle: Gen3 2006 LWB 3.2 GLS 165k km - No modifications

Recently it developed a knocking noise from the front. This happens when one brakes (one solid 'thunk') or when you accelerate (again, one solid 'thunk')
The shock are the originals so I was planning on changing them anyway. Now I had a reason.

Sent it to a local indi

New shocks fitted (std KYB)
Upper ball joint on wishbones replaced.
Noise still there. Sent back.
As per the advise on this forum
The 4 (I think) little donut bushes on the Engine support cross member replaced. Noise still there.
Stabiliser bar drop links replaced. Noise still there.

Mechanic has gone over vehicle with a crow bar and cannot find anything else that is overly loose.

Noise seems to only happen with fore/aft movement of the engine. I am also noting it when turning at parking speed.
If it was engine mountings, Im sure you would hear it just revving the engine.
Its not a rattle like brake calipers. I did the last set of brake pads and know that all the anti rattle springs are in place.

Suggestions please.

Re: Knocking noise, Im at my wits end - please help

Posted: Tue Feb 16, 2016 10:42 am
by Fvdw
Dirty Boy

Did you also replace the rubber bushes on the anti sway bar when you replaced the links?

Fanus

Re: Knocking noise, Im at my wits end - please help

Posted: Tue Feb 16, 2016 7:13 pm
by CATS
You say vehicle is standard. I assume also standard underbody belly plate? Or aftermarket? I once had a knocking noise from stiffer bashplate everytime it came back from oil change due to over tightening, hence the question.

CATS

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