Strange noise on acceleration

[dennis]

i get a slight clunk when i torque the engine from stop.

[JFP in PA]

I know you say it goes away with the belt off, but check your heat shields on the exhaust system, we see a lot of cars with strange rattling noise on acceleration that were traced to loose shields, and once secured, the sounds vanish.

[Frodo]

Originally Posted by JFP in PA

I know you say it goes away with the belt off, but check your heat shields on the exhaust system, we see a lot of cars with strange rattling noise on acceleration that were traced to loose shields, and once secured, the sounds vanish.

Doesn't sound like loose heat shield sounds that I've heard before, but that doesn't mean it couldn't be that. I suppose the reduced stress on the engine when the belt is removed might give rise to less torque-related movement, less vibration overall, and might account for the sound disappearing? I'll look for a possible culprit in that area, though it could be a challenge since, as I mentioned, it doesn't seem to happen except when the car is moving. (Might be tough to replicate on jack stands!)

If I see anything that has any possibility of being the problem, I'll wedge something in there, take it for a short spin and see if the noise is gone. Thanks!

[JFP in PA]

Originally Posted by dennis

i get a slight clunk when i torque the engine from stop.

That is probably your motor mount telling you "it's time"...............