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Mercedes-Benz S55 AMG Rough Idle

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

What are common reasons my Mercedes-Benz S55 AMG has a rough idle?

While there are a variety of reasons your Mercedes-Benz S55 AMG 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.
34%
of the time it's
Vacuum Leak
21%
of the time it's
Spark Plugs
15%
of the time it's
Ignition Coil

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Related Mercedes-Benz S55 AMG Questions

See what others are asking about their Mercedes-Benz S55 AMG. Get answers from RepairPal's community of auto experts and enthusiasts.
I have a bit of rough idle at start up. i have placed new plugs (bosch iridium) car runs fine once it warms up. i hav...
Cleaned maf and it made things 10x better, but for a fleeting moment. symptoms returned and so did cel. replaced maf ...

Mercedes-Benz S55 AMG 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