chirping sound in engine bay area
#1
chirping sound in engine bay area
My brother has a 2012 GMC Sierra that is making a chirping sound when he starts the vehicle and while the engine is running. He stated that he removed the serpentine belt and the A/C belt. He stated when he started the engine it was still making the chirping sound. He also stated that he did a visual on the Hormonic balancer and it wasn't wobbling. He stated he couldn't tell where the chirping is coming from. He stated its in the engine bay area. Can anyone advise what could be wrong, Thanks in advance.
#2
CF Monarch
My brother has a 2012 GMC Sierra that is making a chirping sound when he starts the vehicle and while the engine is running. He stated that he removed the serpentine belt and the A/C belt. He stated when he started the engine it was still making the chirping sound. He also stated that he did a visual on the Hormonic balancer and it wasn't wobbling. He stated he couldn't tell where the chirping is coming from. He stated its in the engine bay area. Can anyone advise what could be wrong, Thanks in advance.
#3
Thanks for the info. He stated that he removed both belts and the chirping noise was still there when he started the engine. Nothing was turning but the crank shaft.
#4
Miss fire on #3 help?
Well the chirping sound has stopped but the engine is miss firing now on cylinder # 3. . The injector, spark plug, coil pack, spark plug, and spark plug wire were changed but each time the check engine light came back on and showed a code of 303., Not sure what could be the problem. The truck was running great before the chirping sound and now the miss firing and the truck runs rough. Any suggestion on what I need to check your help is appreciated.
#5
CF Monarch
Well the chirping sound has stopped but the engine is miss firing now on cylinder # 3. . The injector, spark plug, coil pack, spark plug, and spark plug wire were changed but each time the check engine light came back on and showed a code of 303., Not sure what could be the problem. The truck was running great before the chirping sound and now the miss firing and the truck runs rough. Any suggestion on what I need to check your help is appreciated.
#6
Yes, and should do a compression test on the offending cylinder and the cylinders on each side of it to compare.
Last edited by PNW NBS Z71; November 20th, 2020 at 6:14 PM.
#7
Miss fire on #3 help?
Thanks for the information on the compression test. We did the test on 1,3,5 and they were all at 170. Number 3 is the one we are still getting the miss fire on and the truck is still running rough.
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