Please help diagnose

[Lucy06]

Some days this happens some times it doesn't. After getting her warmed up on freeway usually (doesn't seem to do it cold). I'll let off the gas and chirp chirp chirp as I am idling down and coasting. Then sometimes if I get on it hard and let of there is a loud chirp chirp and then as I am coasting down chirp chirp chirp chirp. Sometimes I think I can hear it very quiet at idle but I think that is just my head. Any Ideas?

[Dave]

Where is the sound coming from?

[mudrunninpig]

I agree with dave, more info please

[Lucy06]

That might help, it's coming from the engine compartment, sounds like it could be closer to the passenger side. Also, it seems like it might be related to when the boost builds up. It happens a lot when I am throttling up a hill.

The chirp almost sounds similar to a belt or pulley but you really can't hear it when it is idling and it doesn't do it when the truck is cold.

[mudrunninpig]

do you here the chirping at all when you turn off the truck and the turbo is winding down?

[Lucy06]

Not that I have noticed. I'll listen more closely next time, but I am pretty sure that it doesn't.

[Ozone-etr1]

my money is on the driveline support bearing mine sounded like a police siren when it went out

[Lucy06]

Listened today, and I couldn't hear any chirping as I shut off the truck.

[Lucy06]

Bump for any other input...

[Ozone-etr1]

Originally Posted by Lucy06

Listened today, and I couldn't hear any chirping as I shut off the truck.

Ok is it as you shut the truck off or driving the truck?

if you cherp while the truck is shuting down most likely its the rotationals of the motor fighting the serp belt...crank turns a bit while everything else sits still...or while running money is still on that bearing