Strange noise at idle
 

1987 carrera coupe, 100 cell cat, stock muffler, SW chip. runs great...
For a long time now, I have had this hollow metalic sound at idle. It disappears when revs increase and it reminds me of a water pump sound on water cooled engine cars needing service. I tightened many of apparent vaccum hoses, intakes etc...
It might be a natural carrera sound...
Any suggestions on getting rid of it? Thanks

Any idea what section of the engine you hear this?

Valve adjustment??

Do you have the same sound when you depress the clutch ?

Cheers !
Phil

My 1987 makes the same sound until I rev the motor then it goes away

does it sound somewhat like a kazoo, and is it located near the right side of the engine compartment? If so, it's probably your Auxiliary Air Valve.

strange noise at idle
 

I can not locate the source and location of the noise..it comes from the engine area...

Yes the noise is not there at higher engine revolutions.

I will evaluate results of depressing the clutch

If you've owned the car a long time, is this a new noise? or something developed over time?

Strange noise at idle
 

I have owned the car for 15 years...Same noise since day one.

LOL! Fifteen years and nothing's come of it?

Noise.
 

David,

Have a look at the engine mounted heater blower unit during idle.

There are several mounting points.

Good luck,

Gerry