Mercedes-Benz Forum - View Single Post - Need help! Engine Misfire Saga On 99 S500
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post #4 of (permalink) Old 04-14-2011, 06:56 PM
Mercedes mechanic
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I would bet that the live datastream reading's on the o2 sensor's are way out of whack. If you can do datastream, try watching the voltage on the o2 sensor. Starting out the fuel mixture will be a little rich. As it reaches operating temp the switch time should be within a half second or so. The voltage should be between .200v to .900v and switch from high to low and back every few seconds. The multiable misfire lead's me to believe that you are having a back pressure problem.

The only thing I can suggest if you can not do a datastream is to pull the plugs on the same side of the #8 cyl, see if they look differant on the electrode's from those on the opposing side. If one side plug set looks black and the other side does not you may need to look into it further.
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