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Mercedes-Benz S500 Rough Idle

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

What are common reasons my Mercedes-Benz S500 has a rough idle?

While there are a variety of reasons your Mercedes-Benz S500 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 S500 Questions

See what others are asking about their Mercedes-Benz S500. Get answers from RepairPal's community of auto experts and enthusiasts.
My 1995 s500 with 96000 miles runs rough while idle. while driving it seems to run fine. i have changed plugs,wires,r...
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Related Mercedes-Benz S500 Problems

Find the most common driver-reported problems that are to blame when a Mercedes-Benz S500 has a rough idle.
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Mercedes-Benz S500 Repairs and Prices
All costs based on RepairPal Fair Price Estimate™ averages. Actual prices may change depending on final diagnosis.

Mercedes-Benz S500 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