Chevrolet Repair Questions? Ask a Chevy Mechanic for Answers ASAP
Have you used a stethoscope to try and pinpoint the source of the noise? Currently I am leaning most towards poor oil maintenance and the noise is a cam bearing making this noise.
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The warranty is out by time, its to old.
Does the chirp speed up with engine rpm?
I still think its internal in the engine, but understand your in a pickle not able to pinpoint it better. Though you have ruled out the external things that could be to blame.