GLK cold start rough idle issue

My 2012 Mercedes GLK with a gasoline engine runs very poorly during cold starts. It misfires and struggles to maintain a smooth idle until it warms up. With about 188984 km on the odometer, could this be related to fuel injection issues? Has anyone else encountered similar symptoms and can offer insight before I proceed with an injector test or further fuel system diagnostics?

4 comment(s)

I have a GLK as well, and I went through something similar last year. Rough idling on cold starts, almost stalling sometimes. Turned out to be a fuel delivery problem traced to one of the injectors. It was a pain! Have you noticed any change in fuel efficiency or any unusual smells?

Thank you for sharing your experience. I have not observed any significant changes in fuel efficiency, nor have I detected any unusual smells. Could you elaborate on how you diagnosed the issue and what steps you took to resolve it? I am trying to determine if an injector test is the next logical step.

I didn't do the test myself. Honestly, I was as frustrated as you probably are now, and I took it straight to a workshop. They ran an injector test and confirmed one was bad. It’s probably best to get it checked professionally to be sure.

I appreciate your recommendation. I will schedule an appointment with my trusted workshop to perform a comprehensive injector test and fuel system evaluation. Following the diagnosis, I will proceed with the necessary repairs, which I anticipate will cost around 515€. Thank you again for your assistance.

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