Mercedes-Benz 300E Rough Idle
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What are common reasons my Mercedes-Benz 300E has a rough idle?
While there are a variety of reasons your Mercedes-Benz 300E 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 300E Questions
See what others are asking about their Mercedes-Benz 300E. Get answers from RepairPal's community of auto experts and enthusiasts.
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Mercedes-Benz 300E 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
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