raphaelwagner1
Mercedes M Klasse Diesel Performance Problems Solved
Summary of the thread
A 2011 Mercedes M Klasse diesel with 199,880 kilometers was experiencing starting issues, increased fuel consumption, reduced power, and stalling while idling. The suspected cause was a defective injection nozzle. After consulting with another owner who had similar issues, it was suggested to check for clogging in the injection system. A diagnostic scan confirmed the injector problem, leading to the replacement of the faulty nozzle and cleaning of the system, which resolved the performance issues.
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4 comment(s)
raphaelwagner1 (community.author)
The prospect of clogging seems plausible. When you experienced similar difficulties, did a diagnostic scan confirm the injection nozzle issue? Were any specific error codes generated that might aid in my assessment?
sarahflamme4
The diagnostic scan did point towards the injectors. I don't recall the specific error codes, but the mechanic confirmed that the injectors were not spraying fuel correctly. Given the symptoms you described and the mileage on your vehicle, it's probably best to have a workshop examine the injectors directly.
raphaelwagner1 (community.author)
Following your advice, I entrusted the vehicle to a qualified mechanic who confirmed a defective injection nozzle. The repair cost 515€, and involved replacing the faulty nozzle and cleaning the remaining components. The vehicle now operates flawlessly, exhibiting a return to its original performance levels. Thank you again for your time and expertise.
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MERCEDES
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MKLASSE
sarahflamme4
I had similar performance issues with my M Klasse diesel a while back such as rough idling and sluggish acceleration. Have you checked the injection valves for dirt or debris? Clogging in the injection system can definitely lead to those symptoms. Has the vehicle had any recent fuel system maintenance?