joeeyl

I have a scraping noise when the engine starts but this is not every time when it starts. This will happen maybe once in 20 times of starting. The noise sounds from the engine and I have checked with a stethoscope and can not pin point it in any thing that I can check. The noise will last for around 2 to 3 minutes then go away. The volt shows around 12 while noise present then goes to 14 after noise leaves. The alternator is turning and the bearings sound normal.

Cybermind

You pretty well answered your own question. If your alternator voltage drops 2 full volts while the noise is present, I would suspect the alternator is going bad. What is the mileage?

joeeyl

The vet has 76,000 and I thought that was the problem but the dealer has looked at this problem and they say the alternator is ok. The noise has not been heard by the dealer for it will go away before I could get it there. The dealer did keep the car for a week and tried starting it often but it did not do it while they had the car.

bobby777

Don't worry about it--would happen all the time if a problem--drive it

joeeyl

Found the noise and it was the bendix in the starter was not releasing when started.
The noise did not go away in very short time and was able to get to dealer before it quit.
The dealer was able to locate the noise and replaced the starter. This was the first one with that noise that they have seen in the C-5. They do a lot of Corvette work.
Thanks to all for help and encouragement in resolving this problem.
Joe