Clunk when driving over speed bumps

Bigphil1474

I had a similar ish experience last year, but in a 2004 banger Rover. Turned out that one of the exhaust mounting rubbers at the front was fixed to the exhaust but not the car, and the arm that the rubber should have been on was catching on something when both wheels went over a full speed bump. Fortunately (?) the back of the exhaust fell off through rust and the mechanic spotted the missing rubber when I had that done, so should have taken it in 3 months before when I started noticing the banging, rather than turning the radio up a notch.

londonTiger

if you're post on moneysavingexprt for mechanical advice - you are probably clueless about mechanics of cars.

My suggestion - take it to a mechanic for diagnosis. I have posted on forums and got advice, read lots of articles and then take the car to mechanic and they point out something completely different.

e.g. I got a scan tool and fought an error on oxygen sensor. I scoured everywhere and got advice of lots of different people. I thought it must be the sensor or an intake inssue. Lo and behold there's a crack in the exhaust that nobody mentioned.

Incidently, fixing the crack on the exhaust made the car a lot quieter too.

Strider590

fordfocus-chav-car wrote: »

I have a Renault grand scenic, when I drive over speed bumps with both fronts wheels you can hear a really loud clunk.

This only happens when both front wheels go over the bump, if I drive over with just one wheel on the bump no noise from either side.

In normal driving everything seems fine...

Anyone have a idea what it may be.

I think in your case it's the drop links on the ARB and ironically it's this ^^ manner of traversing speed bumps which actually causes wear to your suspension/etc.

The ARB is there to keep the front end level and even, when you force one wheel up on a speed bump, this puts a huge stress on the ARB and drop links.

BobQ

It sounds like a broken spring to me. If it is this you may be able to see if this is the problem by looking underneath with a torch. If its that go to a good independent, a main dealer will charge a lot.

I agree about not driving over speed bumps at an angle. Not only does it cause adverse wear on some steering systems but there is agreater risk of grounding something

arcon5

I very much doubt it's a broken spring making the clunk! Many idiots lower their cars be cutting te spring and certainly don't experience 'clunk' noises over every bump or pot hole.

Generali

peter_the_piper wrote: »

Drive slower over the speed humps?

I just turn up the stereo.

Iceweasel

Pity the OP hasn't come back to give us an update - but I reckon the best most likely answer was the first item mentioned in the first reply - post#2

Drop links.

pendragon_arther

londonTiger wrote: »

if you're post on moneysavingexprt for mechanical advice - you are probably clueless about mechanics of cars.

My suggestion - take it to a mechanic for diagnosis. I have posted on forums and got advice, read lots of articles and then take the car to mechanic and they point out something completely different.

e.g. I got a scan tool and fought an error on oxygen sensor. I scoured everywhere and got advice of lots of different people. I thought it must be the sensor or an intake inssue. Lo and behold there's a crack in the exhaust that nobody mentioned.

Incidently, fixing the crack on the exhaust made the car a lot quieter too.

:rotfl::rotfl::rotfl:

The noise from the rear of the car should have been a clue.

fordfocus-chav-car

update:

It seems to be the dog bone.
We are fitting it tomorrow, so will update if it stops the noise.

BobQ

arcon5 wrote: »

I very much doubt it's a broken spring making the clunk! Many idiots lower their cars be cutting te spring and certainly don't experience 'clunk' noises over every bump or pot hole.

Doubt all you want but I had a clunck like this and live in a road with speedbumps. The problem was a broken spring. A near neighbour had a similar problem which was a broken spring. Of course it depends exactly what the noise was like.