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Cadillac
Seville STS
15

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
15 people reported this problem
Comments
Viewing 1 - 5 of 5 comments
mpg dropped 1-2mpg, then rough acceleration, then misfire code
replaced
suggest replacing spark plug boots USE LOTS of dielectric grease
Coolant leak out of cylinder head causing cylinder 2 to only have 40 lbs of compression when cold. Car having difficulty accelerating.