jinglis
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- Apr 12, 2021
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- Your Mercedes
- Mercedes Benz # 350 W212 2011
I have a W 212 E 350 2011, with 109,000 miles on it. Started idling rough out of the blue, was on my way to buy some fuel injector cleaner when the engine light went on. Friend works at a Chevrolet dealership and I plugged the car into the diagnostic device and it said misfire on #2 and #5 coil. So bought 2 new coils and installed them, still had bad readings on both and a rough idle. Swapped the coils around and its not them. (should have done that first) Removed the plugs, they only had 11,000 miles on them and the gap was off, so changed them to 0.8 reinstalled them and it ran smooth and the readings were fine on each cylinder. About an hour later the engine light went back on and it starting idling rough again. So back to square one, guess I will take it back and have anther diagnostic check, but I have a feeling it is the fuel injectors. I did add a can of Lucas injector cleaner but have not driven it much since then. Any advice would help, have been able to fix everything so far on this car myself without going to the stealership.
Jim
Jim