When I am driving on a bumpy road there is an annoying rattling/knocking noise. The only other time I hear this noise is when I accelerate quickly. A non-mechanic friend said this could be the struts...does that sound right?
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On that particular vehicle, and is very common, the rear upper strut mount rubbers wear out and cause a rattling noise. The noise is influenced by road conditions and speed and will vary in noise intensity.
Put the car and a rack and listen for the noise, it is liklely a broken catalytic converter heat shiled weld. If that is the case DO NOT REMOVE IT get a couple of large band clamps from a building supplu store and clamp the heat shield tight to the converter body
look at the front lower engine mount. I had similar noise which has been driving me nuts, thought may be thesway bar links, put it on friends hoist and saw that the front engine mount (mounted to bottom of lower radiator support) was cracked and the rubber bushing inside very worn with pieces missing. odd thing is that reving, or putting into gear never caused it to make a noise, just certain bumps. I ordered part from Autozone,hopefully it gets here before the holiday week end is over. Good luck
Not a very detailed description, but assuming the rattle is in front it may be bad shocks. A quick test would be to push down hard on the left fron of the car and let go, if the car springs back up and just stays there the shock is fine but if it comes up and dips down once again the shock is bad, it should come straight back up and stay there. Repeat on the other side.
If it were a knocking noise it would possibly be a ball joint.
Hope this helps.
its probably your bump stops. the vw ones are very soft. i bought ford escort (the shape after the xr3) ones and cut them a little down to fit. i think the noise is either your shock touching or the sound of the tire scraping the body of the car. hope this helps.