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tomhimmel43

Mercedes SLC rough idle and acceleration issues

My 2018 Mercedes SLC with a gasoline engine is giving me fits. It only has 40928 km on it. The engine is running rough, stalls at idle, and the check engine light is on. Plus, it jerks when accelerating. I suspect it's an ignition coil issue, maybe a bad connection? Anyone else experience this?

Summary of the thread

A 2018 Mercedes SLC with 40,928 km is experiencing rough idling, stalling, and jerking during acceleration, with the check engine light on. The suspected cause is a defective ignition coil, possibly due to a bad connection. After consulting with others who had similar issues, it was confirmed that the problem was indeed a faulty ignition coil, which was resolved by a professional mechanic, restoring the car's performance.

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4 comment(s)

PEJung

Rough idling and jerking sounds familiar! I had similar issues with my SLC. Check the ignition system first. Could be the ignition coil. How mechanically inclined are you?

tomhimmel43 (community.author)

Yeah, I suspect the ignition coil as well. How did you pinpoint yours? I'm no expert, but I'm decent with a wrench and multimeter. Any specific tests I should run?

PEJung

Symptoms are similar to what I experienced. I tried diagnosing it myself, but honestly, the vehicle diagnostics can be tricky. Ended up taking it to a workshop. They found a defective ignition coil, likely due to a faulty cable connection. It sorted out the check engine light and engine hesitation right away. Best to get yours checked by a professional.

tomhimmel43 (community.author)

Thanks for the insight! Based on your experience, I'll bite the bullet and take it to a mechanic. Turns out it was exactly what we thought: a defective ignition coil, caused by a bad plug. Repair cost me 95€. Runs like new now!

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MERCEDES

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SLC