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?

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?
The statements expressed above are only for informational purposes and should be independently verified. Please see our terms of service for more details
  1. Home
  2. Questions
  3. Screeching chirp noise engine - 1991 GMC K2500

Get an instant quote for your car

Our certified mechanics come to you ・Backed by 12-month, 12,000-mile guarantee・Fair and transparent pricing

Get a quote

What others are asking

Q: The car makes loud shaking/jarring noise when the steering wheel is only slight turned rightward. There is no noise when turning left.

Hi there. From the description you have provided, the noise you are hearing from the rear of the vehicle and the feeling your vehicle has while driving, should be looked at sooner than later. The swaying (fish-tail) action, could be...

Q: Engine sputtering and oil is leaking

Hello. My biggest concern would be the oil leak. I would need to locate the cause of the oil leak and also see how low the oil was when this issue occurred. If the engine oil was low enough, then...

Q: Burning smell from under the hood and I don't know what it is.

The smell of something burning could be many different problems from something stuck to the exhaust like a plastic bag to oil or coolant leaks on the engine. The smell comes into the passenger compartment through the air intake vents...

Related articles

P0052 OBD-II Trouble Code: HO2S Heater Control Circuit High (Bank 2 Sensor 1)
P0052 code definition HO2S Heater Control Circuit High (Bank 2 Sensor 1) What the...
P0240 OBD-II Trouble Code: Turbocharger Boost Sensor B Circuit Range/Performance
P0240 code definition Turbocharger Boost Sensor B Circuit Range/Performance What the P0240 code means P0240 is an OBD-II generic code triggered when the Engine Control Module (ECM) detects the intake boost...
Rules of the Road For Iowa Drivers
Driving on the roads requires knowledge of the rules, many of which are based on common sense and courtesy. However, even though you know the rules in...