2.0 exec 406 has been running well just lately, no major problems to report, except a very annoying "knocking" kind of sound from the rear that's just started in the last few weeks.
It only appears at low speed, and only on uneven surfaces. It takes VERY little for it to show itself. It sounds a lot like a box floating about loose in the boot to be honest, but seems to be coming from beneath the back seat.
I've had the back end in the air, and all the usuall culprits are still sound and intact (ARB droplinks, track bars etc - all replaced less than 5,000 miles ago too). All other bushes look to be in pretty good nick, with no sign of any excessive movement when crow-barred about.
The only bushes that are almost impossible to check for movement are the ARB bushes, and the subframe mounts. The ARB bushes are in a bit of a state to look at, so I have a strong suspicion they may be the fault, but have also read on here that the subframe mounts can go - or is that only on trailing-arm'ed cars (I forget which car I read it in relation to)? Surely the multi-link nature of the suspension should avoid the mounts taking quite so much load...
I had read on the 'net that the rear seat and it's locking mechanism can cause this kind of noise, but I can't seem to replicate it by waggling the seat about, so I've dismissed that idea.
The exhaust was my other theory, especially as teh centre box took a bash the other week over a particularly nasty speed bump (it's dented the box
), but again, I can't replicate it by waggling the thing about by hand, and all the rubber mounts seem fine, with no sign that anything has been dislodged in any way.Over to you.
