mysterious metallic "clonc"?
Discussion
Hi all!
I love the pops and the bangs from my car, but recently it starts with an metallic clonc. It sounds a little bit like knocking on a spring and it seems (but I'm not sure) to come from the mid section of the car.
I went to a garage twice, but we couldn't find the problem.
We checked:
- all silent bumpers
- all dampers
- steering
- all prop shafts
- engine mounts
- diff/gearbox bumpers
- wheel bearings
Any ideas?
Next step will be demounting the prop shaft and then total demount of all wheel suspensions...
cheers Josef
I love the pops and the bangs from my car, but recently it starts with an metallic clonc. It sounds a little bit like knocking on a spring and it seems (but I'm not sure) to come from the mid section of the car.
I went to a garage twice, but we couldn't find the problem.
We checked:
- all silent bumpers
- all dampers
- steering
- all prop shafts
- engine mounts
- diff/gearbox bumpers
- wheel bearings
Any ideas?
Next step will be demounting the prop shaft and then total demount of all wheel suspensions...
cheers Josef
I think more info might be required...
When you say 'starts' - do you when the engine starts? ie the clunk happens the car is stationary and you start the engine?
or is it on the move?
is it just when the engine is cold or also when its hot?
...a bit more detail might help the better experts than me narrow things down!
When you say 'starts' - do you when the engine starts? ie the clunk happens the car is stationary and you start the engine?
or is it on the move?
is it just when the engine is cold or also when its hot?
...a bit more detail might help the better experts than me narrow things down!
Sepp, maybe this: http://www.pistonheads.com/gassing/topic.asp?h=0&a...
Not sure if this is the same but I have recently noticed that when my T350 is hot I get a metalic clonk (really only noticeable at slow speeds). It only happens when the car is moving so it is not engine. Doesn't seem to be dependant on load so not engine mounts. I can only describe the noise as if it was something standing vertically and rocking side to side with movement of the car and hitting against adjacent surfaces.
I can't find anything loose and, as I said it only happens when the car is hot? It is driving me crazy!
I can't find anything loose and, as I said it only happens when the car is hot? It is driving me crazy!
zeppo said:
I have a rattling exhaust - exhaust is totally fixed, but the diffusor is shaking at 2-3000RPM and hits the exhaust...
But I will check the fuel tank this weekend...
I noticed that, on my diffusor there were burn marks from where the back box 'rested' on it when hot (the sports cans have eliminated this problem). I wonder if it's worth adding some after market heat shield to the top of the diffuser, which would be hidden due to the number plate/rear exhaust shield - this should also minimise rattling when the exhaust heats up, shouldn't it?But I will check the fuel tank this weekend...
chris watton said:
I noticed that, on my diffusor there were burn marks from where the back box 'rested' on it when hot (the sports cans have eliminated this problem). I wonder if it's worth adding some after market heat shield to the top of the diffuser, which would be hidden due to the number plate/rear exhaust shield - this should also minimise rattling when the exhaust heats up, shouldn't it?
Chris...I must be a few steps ahead of you on the mods front! My car suffered from a crispy rear diffuser too so I applied some heat reflective material in the manner you described (I think!)...all is well so far...peteA said:
Chris...I must be a few steps ahead of you on the mods front! My car suffered from a crispy rear diffuser too so I applied some heat reflective material in the manner you described (I think!)...all is well so far...
Wow! That's exactly what I meant!Your car looks like my colour on those shots!
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