[Guest]

I have a 91 Caprice Classic, 156,000 miles. I seem to have a rattle coming from the motor. It rattles only when the motor is warm. It is not the pulleys, for I had them checked. Took it to one mechanic and he could not find it. Any help for me?
the sound also comes and goes. usually if i give it some gas and when it lets off the sounds comes immediately

 

[Guest]

It's a pretty vague description but one thing that starts suddenly and often gets overlooked is the flywheel.I have seen several that are cracked but still work to start the car.The cracks flex as the engine spins and make a unique sound that usually is noticed when the engine warms up and the cracks in the flywheel are slightly larger.