Exhaust sqeaking noise

[Brad_P]

I have a noise that sounds like its coming from the rear of my car. The noise only happens under initial acceleration, it is a high pitched rattle noise. It kinda sounds like nails on a chalk board so im assuming it is metal on metal. Could it possibly be there the u bolt on the hanger touches the pipe?

 

[MotoArts]

Bad universal joint on the driveshaft.

Check both of them; replace if either has any play, tight spots or dry/rusted needles.

Don't drive it if either one is bad. The squeak is your only warning before disaster strikes...

 

[Brad_P]

Changed the U joints, still got a squeak. Changed the hangers, still got a squeak. Up next is the rear exhaust mounts, the rubber is pretty bad and i hope this will fix it.

 

[Mister 4x4]

Muffler bearings going bad? :huh:

I am SO sorry for that. :shy:

 

[Brad_P]

that or the blinker fluid

 

[judge]

I have had a noise coming from an incorrectly installed tail pipe. Once it was rubbing the axle, another time

I have had the pipes rub on the springs. For testing I could bounce up/down the rear of the car. putting a few people in the car and checking the underside clearances could be helpful.

 

[Mister 4x4]

Can you jack up the rear end, put the axle on some jack stands and inspect while the car is in Drive and accelerating? That would help rule-out driveline bearings going bad.

I had a '78 K5 Blazer roach the spiders in the 12-bolt rear axle going up the on-ramp with a loud "Bang!" When I decelerated at the next off-ramp, I heard a similar noise you speak of, that went away by putting the car in Neutral, then back into Drive when I needed to take off again. I also had a rear wheel bearing going bad on my '95 Honda, which would make a high pitched noise running up to speed, then back down as well.

Putting the rear end up like that for a visual inspection is your best bet. Good luck and hope this helps.

 

[OMS]

Might be a baffle in the muffler

 

[MotoArts]

Yes, need to determine if the noise is suspension/other mechanical, OR coming out of the tailpipe itself.

A bad exhaust valve (when burned at the valve seat) will chirp like a cricket out of the pipes, too.