Cadillac Seville SLS Rough Idle

Learn if it's a simple fix or time to seek out a trusted technician.

What are common reasons my Cadillac Seville SLS has a rough idle?

While there are a variety of reasons your Cadillac Seville SLS has a rough idle, the most common 3 are a vacuum leak, an issue with the spark plugs, or a problem with the ignition coil.
of the time it's
Vacuum Leak
of the time it's
Spark Plugs
of the time it's
Ignition Coil

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See what others are asking about their Cadillac Seville SLS. Get answers from RepairPal's community of auto experts and enthusiasts.
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Related Cadillac Seville SLS Problems

Find the most common driver-reported problems that are to blame when a Cadillac Seville SLS has a rough idle.
The egr valve may stick open, causing a rough idle and/or the check engine light to illuminate.

Cadillac Seville SLS Rough Idle Repair Symptoms

A failing ignition coil will create misfires in the engine, and lead to hesitation, extreme power loss, engine stalling, poor fuel mileage, and illumination of the check engine ...Read More
As we discussed, spark plugs are necessary for any gasoline engine to run. When they fail, the engine is in a constant state of attempting to ignite air and fuel, but cannot. Th...Read More