Peter Ivanov

Anyone please help? Several mechanics cannot identify this. It is driving me crazy?

4Warner

It could possibly be one of the catalytic converter dampers humming? I think the car has 2 or 4 wafflecone type sound dampers from the downspout to the central cat system that has 2 cones I believe. They tend to burn out over time due to the high temps the exhaust system operates at.

If it doesn't affect the drivability, this could be the culprit.

Mine didn't sound like that but I had an alarming sound some years back coming from the underside, and it turned out to be the cats. Bought a refurbished set online and got a decent core back and I think it was about a $400 expense. $500 with labor...

Hope yours isn't bad...Let us know what you find out...