95- c280 Problem/HELP PLEASE - Mercedes-Benz Forum

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post #1 of 7 (permalink) Old 11-12-2006, 04:42 AM Thread Starter
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95- c280 Problem/HELP PLEASE

I have a 1995 c280 127,000mi. The problem is the car runs very smooth until I give it some gas, it pops or a muffled backfire and one of the cylinders drops out and it runs on 5 cylinders, all I have to do is turn the car off then restart and it runs fine until I jump on it again. The engine light came on about 6 months ago and the code shows og sensor which I changed and ineffecficent cylinder firing. I have changed plug wires, plugs, and gas filter.
The plug wire set only gives you three wires and not the coils that connect the other three plugs, I wondering if one of the coils has gone bad, or some circuit board. But it runs fine when in low idle; it’s almost like one of the plugs stops firing. The only thing I can figure is the type of plugs does make it run different, I think delco plugs make it run like that and I changed to champions. Before that I had a four prong plug and it ran fine.
Some suggestions PLEASE, O’ya my speedometer jumps like the rest of your.
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post #2 of 7 (permalink) Old 11-12-2006, 11:34 AM
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The whole thing about the car acting up when you press down on the gas makes me feel it is the fuel filter. I would check the air filter as well.

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post #3 of 7 (permalink) Old 12-09-2007, 07:38 AM
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I've got a '97 C280 and have the exact same problem. I end up shutting off the car when I come to a stop someplace and it resets itself. I don't have an answer but suspect it is electrical supply to the plugs. I have replaced my plugs to Bosche platinum (no-gap) and the problem eased up. I've got 197K miles so I'm leaning towards one of the coils somewhere in the wiring or the wires themselves. I hesitate to take it to the dealer because I read some other threads on MercedesForum.com where they were just guessing. The fuel filter is not it if your idling fine on start and idling rough once you get the backfire. I'll keep you posted if I here anything.

Anyone out there a PRO that can help?
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post #4 of 7 (permalink) Old 01-04-2008, 03:01 PM
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replace wiring harness
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post #5 of 7 (permalink) Old 01-20-2010, 03:11 PM
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I have the exact same problem, have already replaced wiring harness, MAF and ordered o2 sensors (front and back) since the car also drains the fuel tank. But I have to say that no codes appear on STAR when I went to check it.

I do believe after reading other threads that one or more ignition coils might have gone bad since all 3 are still original as was the wiring harness before I changed it. The car is a c280 1996 with 220.000 miles on the odometer.

The only thing I regret is the time lost to trying out solutions.
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post #6 of 7 (permalink) Old 01-20-2010, 05:23 PM
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Coils have been reported to fail on some of these engines so I would look in that direction.

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post #7 of 7 (permalink) Old 09-28-2010, 11:35 AM
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Start with spark plugs, didn't work? go for wires, same result change your coils and that will hopefully solve your problem. If non of them worked too bad its your wiring harness. if its your wiring harness check for cracks on wires that are hooked to the plugs.

Good Luck.

1995 c280 118k Miles
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