Engine Misfire and/or Lack of Power on Mercedes-Benz S600

Problem Description and Possible Solution

Engine misfires (rough running) and lack of power are commonly caused by ignition coil pack or ignition module faults. Proper diagnoses should isolate the cause and prevent unnecessary replacement of good parts.

Problem Data
RepairPal Verified
Average mileage: 98,223 (29,600–179,800)
12 model years affected: 1996, 1998, 2001, 2002, more2003, 2004, 2005, 2006, 2007, 2008, 2009, 2010
45 people reported this problem
Viewing 1 - 17 of 17 comments
Same issue with the rough running. Three differnet dealerships, three different repairs suggested. control bank (1800), ignition coil (1800) and new spark plugs (1400). None guaranteed to stop the problem so I waited. Figured if I wait long enough, it will be constant and easier to diagnose. Runs fine when first starts, then starts trembling, enginge light comes on, misfiring, low power. Then I noticed the temperature. Always well within operating temperature of the guage, but, while it runs fine at 80C. When I hit traffic, hot days, it goes up near 100C. If it stays there, I can count on the misfire issues. When it's cold, I have the heater on and am doing 80 mph, it stays at 80 and can run fine for hours. Soon as I hit traffic, temp goes up and I misfire. Thermostat? Stay tuned...
When I start the car every morning and start out from a stop , the car misfires and looses power and also smells heavy of fuel odor..
When car is idling and gas pedal is pressed RPM does not go past 3000 and car starts vibrating like it wants to shut off. Took car on highway press gas and car's RPM goes pass 3000. On a cold day have to let car warn up for a minute or two if not car misfires and check engine light comes on. Whenever this happens right side mirror indicator light does not work. This has been being going on for a long time.
left coil pack is needed to repair my S600 V12 Mercedes, its about a $2500-$3000 repair. Car stutters aggressively when pressing the gas pedal to accelerate. You may also hear the engine misfiring if you pay close attention.
check engine light on, running very rough, low rpms, not much power, shifting hard and sounded different... was afraid it was transmission, but my mechanic diagnosed one bank of ignition coil pack bad, part $1,200, labor $350, diagnosis $100.
Multiple Coil packs and six spark plug boot connectors failed. Used code scanner to diagnose the coils and manually inspected all 12 cylinders to verify the boots. Runs smoothly now.
I was diagnosed with a plug (only 20k on 60k Platinum plugs) on both banks being bad; traced to coli. $4200 later the check engine light is off for a change. Car was running fine but I will not pay 4k again to get an 88k auto to run. poor value for the money.
After 4000 RPM's goes to limp mode, re-starting solves the limping problem. Left bank number 8 spark plug is miss firing.
Rough running, hard shifting, delayed acceleration. Mechanic diagnosed failure of both coil packs for a whopping $4,000 repair bill. Unconscionable at this mileage...
Engine light comes on after starting. Diagnostics indicates "misfire" on several cylinders. Car runs great but has a slightly rough idle. Don't have a solution.
Started missing and went to limp mode, I purchased an aftermarket part and that lasted about 6 months so I hade to purchase OEM part from Mercedes ($$$$).
Iskender Kutlucinar