Have you checked for cold solder joints on your K40 relay?Hello!
I have problem with my 1999 slk. She starts shaking on idle when get hot.
Already change: Maf, coils, wires and crankshaft sensor.
Cooling fun don't work neather, i have made some modification to get fun running manually.
If somebody did bad work, fix it or replace it.Yes, left upper corner solder joints is already fixed, but somebody has done bad work, could K40 make some idle problem also?
Star shows no codes.
Performance is ok.