Roy,
Before I can answer your question I will have to know a few more things:
(1) Is the cd itself scratched?
(2) Does this only happen when the car is moving?
(3) Does this happen immediately, or after playing awhile?
If you want, you can e-mail me at TECH10171968@YAHOO.COM and I might be able to give you some answers.
Jim Lee- technician, Graham's TV Service (W. Columbia, SC)
June 2004