Rear bump noise

[BrianM]

I have a 96 4.2 cerbera which is the dogs bollocks quiet frankly. Anyway there is a bumping noise coming from the back end when I go over rougher ground or decelerating but not on the throttle. There is also no engage/dis-engage feeling or noise from the diff. The local TVR people suggested that it would be the diff's top mounting bolt which apparently corrodes all the time. Unfortunatly its not this or anything else such as suspention/trailing arms etc. Has anyone else had a similar experience , it almost sounds like the fuel tank is banging up and down at times (ive checked that as well). Any ideas its driving me bonkers.

[GreenV8s]

quote:I have a 96 4.2 cerbera which is the dogs bollocks quiet frankly. Anyway there is a bumping noise coming from the back end when I go over rougher ground or decelerating but not on the throttle. There is also no engage/dis-engage feeling or noise from the diff. The local TVR people suggested that it would be the diff's top mounting bolt which apparently corrodes all the time. Unfortunatly its not this or anything else such as suspention/trailing arms etc. Has anyone else had a similar experience , it almost sounds like the fuel tank is banging up and down at times (ive checked that as well). Any ideas its driving me bonkers.

Could it be those notorious anti roll bar mounts?

[BrianM]

They looked OK, no slack or movement but then it was on a ramp and not under load. Will look again, thanks.

Brian

[marcusl]

I seem to remember that quite a while ago there was a thread a bit like this. From memory the noise was coming from the tank itself flexing due to pressure changes. Just thought this info might be of use...

[BrianM]

Thanks will check it out as well.

Brian

[marcusl]

I had a bit of a trawl and found the link I was thinking of. It originated in the Griffith area, the thread is entitled 'Noisy fuel tank' and the origination date was 20th April 2001. There seemed to be a few people who'd experienced similar (and in Chimaeras too). Might be worth investigating...

[BrianM]

thanks again.

[BrianM]

Rear Bump noise is getting worse and we still havent got a clue as to what it could be, maybe a top mount for the rear suspension, definately not the fuel tank equalisation as its consistant. Any more ideas would be be of help as its going up on the ramps agin tomorrow. Also now got a leak which seeps water into the passenger footwell, anyone with previous experience here? Thanks all.

Brian