Skip the auto shop - Our mechanics make house calls

Q: Screeching chirp noise engine - 1991 GMC K2500

asked by on

I replaced a screeching belt in my truck a few weeks ago. It was an old, worn out one. But then my truck started a new screech that was different from the belt screech. I took off the belt, spun the pulleys and the tensioner pulley was grinding, so I replaced that. But it didn’t help. I took the belt off and spun the pulleys again. The alternator was screeching, so I bought a new one. And the engine was still making screeching noises. I put in a new water pump a couple of weeks ago, but that couldn’t be making the noise. This screech is more of a chirp than a screech noise, and it will vary depending upon the RPMs. It goes away sometimes when accelerating the car. I had bought a cheap belt, so I better pick up a better brand. That might possibly help. The belt tension is good and so are the water pump, idler pulley and the alternator that is refurbished. My truck has 271500 miles on it and it’s a 5.7 TBI. Do you have any ideas about what might be making the screeching or rather chirp noise?

A: Hey there. The A/C pulley bearing may be bi...

Hey there. The A/C pulley bearing may be binding causing the chirping. Try spraying each belt one at a time with some water in a spray bottle. The noise will change or go away when the belt that is chirping gets wet. To have this verified, a qualified professional from YourMechanic can come to your car's location to diagnose the noise and assist with repair.

Was this answer helpful?

Need advice from certified mechanic? Get help now!

Over 1000 mechanics are ready to answer your question.
The statements expressed above are only for informational purposes and should be independently verified. Please see our terms of service for more details

Ask a Mechanic
(100% Free)

Have a car question? Get free advice from our top-rated mechanics.

Ask A Mechanic
Over 10,000 questions answered!

Get an instant quote for your car

Our certified mechanics come to you ・Backed by 12-month, 12,000-mile guarantee・Save up to 30%

Get a quote

What others are asking

Q: Metal to metal sound when you are at the end of braking, pads have been changed

Hey there, thank you for asking about your 2010 Honda Element. You may just be hearing the metal material that is in the brake pads. There are many different brands and qualities of brake pads and the less expensive pads...

Q: Will not accelerate beyond 65 mph

All vehicles have serviceable fuel filters, in fact your vehicle has 4 or more such filters. That is, EACH fuel injector has its own miniature filter basket so there are 4 potentially pluggable filters right there. There are some obvious...

Q: I have a bus that contain a Cummins engine and Allison transmission. The problem is that the vehicle does not exceed the speed 80 Km/h / 50 mph.

Hi there. Check the fuel filter and the fuel water separator for if they are old and need changed. Check the fuel water separator for a valve on the bottom and if there is a valve, if you can open...

Related articles

How Long Does a Distributor O Ring Last?
The distributor is part of the ignition system in your vehicle and its purpose is to route high voltage from the ignition coil to the spark plug. The spark plug then...
How Long Does a Heater Control Valve Last?
Keeping the right amount of coolant in a car is essential in keeping the engine at the right temperature. Failing to have the right amount of coolant or even bad elements...
P2428 OBD-II Trouble Code: Exhaust Gas Temperature Too High Bank 1
P2428 code definition A P2428 trouble code signifies that the PCM has detected a problem in the exhaust gas temperature sensor circuit in bank 1, which subsequently contains the number one...