When I accelerate hard in 2nd gear at moderate to high rpm and then suddenly lift off (e.g. when aborting an overtaking manouver) I get a knocking noise from the rear end. It sounds like the exhaust hitting the bodywork or something on the supension. However I've looked underneath and can find nothing wrong.

The fault is repeatable and I may take it to the dealers but I'd like to pin the fault down a little better.

If any of the supsension bushes have moved/perished/fell out, surely it would happen more often under other driving conditions. The car goes,stops, corners, travels over speed humps etc without the fault occuring.

Anyone got any better ideas ?

Regards,

Ian M K
Green 4 Dr UK Turbo

p.s. It's not the jack/spare wheel or anything in the boot !!

 

Ian, Hi.

That sounds like a transmission related fault. If it was the suspensions surely it would do it when going over bumps Etc.

Possibly some wear in a drive shaft U/J, the knocking could be the U/J taking up the slack suddenly?

Mike.

 

Thanks Mike & David,

If it's a U/J surely I can feel the play be jacking up that wheel and trying to rotate the wheel back and forth.

I'd be suprised if one of these has gone as I've only done 19,000 miles.

If it's the rear diff hitting the bodywork. Why has it suddenly started doing this ?

Have the bushes supporting the diff got tired ?

If so, surely I can have them replaced under warranty ?

How easy is it to fit the uprated bushes ?

Best regards,

Ian