Electra V6-231 3.8L VIN C SFI (1988)
Top spring coils contact each other (cars without Electronic Level Control)
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This condition can occur in the variable rate design springs used on 1987-89 "H" body cars without Electronic Level Control. If this
condition is suspected, it can be verified by installing insulating material (heater hose or equivalent) to the top coils and test driving. If the
noise is eliminated with the insulating material, the rear coil springs should be replaced with the appropriate springs from GMSPO.
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If the suspension noise is determined to be caused by the rear variable rate coil springs, and the noise cannot be eliminated by any of the
above methods (including replacing the original variable rate rear coil springs with new variable rate rear coil springs), the variable rate
springs may be replaced with straight rate springs (both sides must be replaced) according to the following table:
