samuelbecker6

SL Engine Running Rough

My 2012 Mercedes SL with a gasoline engine is acting up. It's got 128416 km on it. Starting is difficult, fuel consumption seems way up, and the engine feels weak. Plus it idles really rough and sometimes stalls completely. I suspect a dirty diesel injection valve?

4 comment(s)

Rough idling and stalling on a gasoline engine SL could be a few things. I had similar performance issues with my Mercedes. Turned out to be a defective injection nozzle. Have you checked for any error codes? Could also be related to fuel filter or pump issues. Any recent work done on the vehicle engine?

Error codes? Where would I even check for something like that? Is that something I can do myself or is it workshop time?

You can get a basic OBD2 scanner pretty cheap, but if you're not comfortable using it, best bet is a workshop. Defective injection nozzle seems likely with those symptoms. Fuel consumption and reduced power point to that. Could try an injector cleaner first, but might be a waste of time and money. The repair cost me around 500€.

Thanks for the help! Took it to a workshop and they confirmed it was a defective injection nozzle. Repair cost was 515€, but it's running great now!

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