Strange Sound

[Chumpaumpalumpa]

So I went for my first drive in a couple months after getting the car back together. T-belt job new valves and gaskets the whole deal. There is a weird noise which sounds like its coming from near the battery or fuel rail inlet area. You can duplicate the sound by rubbing hard plastic or a sharp edge of your phone on a roughish piece of plastic. Something like the edge of a tic tac container on those small ivory colored trashcans like this:

You must be logged in to view this image or video.

The sound I am hearing sounds like the lower muffled tone you get from doing that. It only happens on deceleration between 2.5k-4k RPM. What could it be?

 

[oneslowwdsm]

Do you have hard mounts? Probably a rattle maybe the latch where the hood bolts up by the fenders? Mine rattle at a certain Rpm.

 

[YUPOK]

Shot in the dark but CAS plate? Sometimes they get loose and make a scratching and its roughly in that area.

 

[Chumpaumpalumpa]

Its definitely a rubbing sound and its very consistent with the RPM I mentioned. I only say 4k because that is the highest RPM it's been up to yet so it might do it higher but it always stops at 2.5k. Its not a rattle but I do have hard mounts. I'll go check the CAS plate but it didnt do this before I did the work. Even on the lightest acceleration or cruise it doesnt do it, only decel.

 

[Chumpaumpalumpa]

Update: It goes away when I push the clutch in. The TOB is 5000 miles old and is an OEM Unit