Mercedes-Benz 300E Rough Idle
Learn if it's a simple fix or time to seek out a trusted technician.
Not your vehicle?
Select your make and model
×
Select Your Vehicle
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
Get your Mercedes-Benz issue diagnosed by a professional
Find a high quality auto repair shop or dealer near you
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.
My '92 300e with 134k miles has a persistent rough idle. changed fuel filter, but it didn't help. what could be wrong?
Trouble getting car to stay idled, it cuts off after taking foot of gas pedal
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
High Quality Repairs
Your auto repair done right, only the work you need with no add ons.
Never Overpay
Our free estimator calculates a custom price for your vehicle repair.
Guaranteed Repairs
Rest easy knowing you're covered by a local warranty.
Are You a Shop Owner?
Learn how to grow your business with RepairPal