Chirping when warm and goes away when over 1500-2000rpm.

[Bryan Schmidt]

So I've got a chirp that's driving me crazy in more then one way. I've replaced the power steering pump, idler pulley, tensioner pulley, new belt, and removed the ac belt and still chirping. I thought maybe an exhaust leak. Muffler shop brought out the stethoscope and put it from head motor all the way back and no leaks. Alternator wasn't making noise either as he put it right on it. Only funny noise he thought was the injectors were making a odd sound. Not sure what they are supposed to sound like but it sounded like a squirting wet sucking noise. The truck has 227,000 miles on it and the only issues I've ever had with it was having to replace the radiator and o2 sensors. I can't afford to keep tossing money into this without fixing the problem. Any advice would be greatly appreciated. Thank you for your time. Have a good day.

[Jsdirt]

Keep in mind a compression leak will make a sound EXACTLY like a belt.

 

Modern PCV systems can, too. Anyone who has owned, or worked on a Chevy Cruze will know what I'm talking about there.

 

Take the belt OFF, and fire it up. If the noise is still there, I'd bet it's got CO in the cooling system. In other words, a blown head gasket. You could get lucky and find it's a PCV issue, exacerbated by worn rings.