michaellorenz77
GLK Cylinder Misfire
Summary of the thread
A 2011 GLK with a gasoline engine experienced combustion misfires, rough running, and a check engine light. The issue was initially suspected to be related to ignition coils, but sluggish throttle response suggested a broader problem. It was advised to consider a fuel delivery issue, such as a defective fuel injector. Upon professional diagnostics, a faulty fuel injector was identified and replaced, resolving the misfire problem.
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4 comment(s)
michaellorenz77 (community.author)
Multiple cylinder misfires could point to a few things. While a single bad ignition coil can definitely cause misfires, multiple misfires usually indicate a problem that's affecting the whole engine or at least a bank of cylinders. Given the sluggish throttle response, I'd lean towards a fuel delivery issue, potentially a defective fuel injector or injectors. You'd be best served taking it to a qualified workshop for diagnostics.
laraguenther1
I appreciate the insight. I took your advice and brought it in. Turns out it was indeed a faulty fuel injector. Replaced the injector and the engine is running smoothly again. Total cost was 515€.
michaellorenz77 (community.author)
Thanks again for pointing me in the right direction.
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MERCEDES
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GLK
laraguenther1
I haven't specifically tested the ignition coils, but I did pull the codes and it's pointing towards combustion misfires on multiple cylinders. Could a single bad coil cause that? Throttle response is definitely sluggish, especially when the engine is cold.