Misfire and/or Check Engine Light Due To Failed Ignition Coil on Cadillac Seville STS

Problem Description and Possible Solution

An ignition coil may fail causing one of the cylinders to misfire. Each of the two banks of cylinders has its own coil assembly. If one ignition coil fails the coil assembly for the corresponding cylinder bank must be replaced.

Problem Data
RepairPal Verified
Average mileage: 116,000 (84,500–167,000)
4 model years affected: 2000, 2001, 2002, 2003
13 people reported this problem
Viewing 1 - 5 of 5 problem details
mpg dropped 1-2mpg, then rough acceleration, then misfire code
suggest replacing spark plug boots USE LOTS of dielectric grease
check engine light due to coilpacks misfiring
Coolant leak out of cylinder head causing cylinder 2 to only have 40 lbs of compression when cold. Car having difficulty accelerating.
rear coil went bad replaced it and ive been fine.
One cyclinder misfires according to the computer diagnostic readout 14,000 times!)It is in the shop now.