Sometimes at idle, I have a faint chirping, like a bird going "tweet-tweet-tweet". Its not obnoxiously loud like belt squeak, and you cant really hear it unless you're standing next to the truck outside. It goes away the second you tap the accellerator. Its probably the belt...but could it be something more important like a bearing in one of the belt driven accessories? Its just barely loud enough to be annoying. Is it "safe" to take the serp belt off and run it for a couple seconds to see if it goes away?

Yep..take the belt off Ben..The water pump is gear driven

maybe its cause one of my pulley's is square?

Remember Scott, im in 7th grade cause I not only failed "colors" but I also failed "shapes" ):h

Check for an exhaust leak. Possibly near the egr blocker plate location.:)

Hello Ben, you've been through a tranny build and etc. Its the serpentine tensioner. Mine used to do it every morning(when cold) now since its warm it doesn't do it any more. Unless the 2nd set of injectors(that just got replaced)has anything to do with it.
Greg

Check for an exhaust leak. Possibly near the egr blocker plate location.:)

EGR? huh?:confused:

the blocker plate is 1/4" steel, welded onto the exhaust riser :D

Ill check for exhaust leaks tho, and take off the serp belt when it starts doing it again. That tensioner has got to be fun to replace.:rolleyes:

ben

Remember Scott, im in 7th grade cause I not only failed "colors" but I also failed "shapes" ):h

I thought it was tranmission lifting :D

Jim

Its the serpentine tensioner.


I've had this same noise and solution on 3 GM trucks to date.

how hard is it to replace? I really dont want to take it to the dealer unless I have to, god forbid they see my new spinny thing on the engine

I don't know how similar the LS1 & Dmax serpentine and accessory items are, but common tweety noises on the LS1 is a mis-aligned power steering pump pulley. It makes the belt squeal real bad when cold.

Cheers,
Ross

I read this post kind of late, but it sounds like an AC compressor engaging to me.

On this truck, I have found that the compressor runs even when the AC button is off, recirc is selected, and normal "to the face" vent selection is engaged. I use it all the time as a kind of "econo" AC setting. Not quite as cold as the real AC, but does the trick on warm days.

It was the exhaust rattling :)

all fixed now.

Probably somthin to do with the cloud of soot under the hood??? ):h

where's the pics of your fix. It may come in handy for some...

Ill see if I got any pics of it...my camera was dieing at that point...a gig of pics had taken its toll on the battery.

basically Eric cut off the EGR riser/manifold and welded a plate in place (Im no good at welding thin stuff)

now for cleaning up my whole sooty dirty engine compartment!! :mad:

ben

how hard is it to replace? I really dont want to take it to the dealer unless I have to, god forbid they see my new spinny thing on the engine

):h ):h

It was a bad alternator on mine .

[quote=DURAtotheMAX;1084293]Sometimes at idle, I have a faint chirping, like a bird going "tweet-tweet-tweet". Its not obnoxiously loud like belt squeak, and you cant really hear it unless you're standing next to the truck outside. It goes away the second you tap the accellerator. Its probably the belt...but could it be something more important like a bearing in one of the belt driven accessories? Its just barely loud enough to be annoying. Is it "safe" to take the serp belt off and run it for a couple seconds to see if it goes away?[/quote

You have a bird. Remember when I found the Bagel?

how hard is it to replace?

For future referrence its not hard at all/ One bolt and it falls off.