GM Repair Problems? Ask GM Repair Expert Now.
Sounds like a serpentine belt. Has that been replaced? they can make a noise from a constant chirping sound to a terrible squeal. when increasing engine RPM, can get much worse, or go away completely.
is it a constant noise? or more like a chirping sound?
Can you remove the belt and run the engine to make sure it's not the water pump or the alternator?
Could also be an intake air leak, or a vacuum leak. Is it running any differently? is the CEL on?
CEL is check engine light. Wondering if your fuel trims are high indicating an intake leak
alright. I'll let somebody else have a shot at it. Hopefully somebody here has seen this before.
Hello. My name is ***** ***** I will be helping you today.
First of all your deposit has not been applied to the previous expert.. he was not able to help so he opened it to other experts so you get the best service possible. You say big help this was as if the helping is over.
If the noise is still there with the belt removed and there are no codes in the computer it sounds like its bad bearings. Sometimes when a bearing first starts making noise it can be interpreted as a squeaking. I cant hear the noise so I have to go on your description. Are you willing to try to describe in better detail what you are hearing?
Can you use a mechanics stethescope (or a long section of vacuum hose or something) and listen around and see if you can narrow down what area of the engine the noise is coming from?
I assume you checked the valve covers and timing cover in various spots?
If you had to guess would you guess the noise is happening at about every revolution of the engine or half the engine speed?
OK. It is most likely valve noise. I am attaching a TSB that will give you tons of information on valve noises in these engines.