I recently took my car in to have the oil valve covers replaced because they were leaking oil and causing the car to smoke. I picked my car up and when I idle and accelerate my car shakes violently. The mechanic is telling me that the ignition coil is bad and so is a spark plug. I did not have this problem when I took the car in. Is my car just going bad or did the mechanic cause this problem?
violent shaking in car after having oil valve covers replaced on 2001 Cadillac Catera
by heidic712 in Shepherdstown, WV on January 28, 2011
ANSWER by DaveJHM on January 29, 2011
Each valve cover has a coil pack - basically three individual coils joined into one unit. They go into the valve covers, and must be removed to access the valve cover gasket. When you pull off a coil, the rubber insulating boots on the coils can become compromised. I would say that the mechanic did not cause the problem directly, but the problem likely occured as a result of removing them in the first place, based on age and mileage. Perhaps proactively they could have been included in an estimate for repairs.