1999 ML320 misfires - Page 2 - Mercedes-Benz Forum

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post #11 of 15 (permalink) Old 09-11-2007, 07:27 PM Thread Starter
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Replaced all plug wires which resulted in the engine running better. The misfire still occurred but on a more regular basis. (Daily at the start of a trip the misfire would occur, the engine ran rough and the Check Engine light would come on. The Misfire went away when the car was turned OFF then back ON. Eventually the Check Engine light would go off by itself. The next day the cycle repeated.) Here's what the mechanic did and I have gone almost a month and 500 miles with no misfires. He "retrained" the computer to tell it where the crankshaft was.

Thanks for all the tips and I hope this may help someone in the future.
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post #12 of 15 (permalink) Old 09-12-2007, 12:38 AM
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Just curious, did he retrain it by replacing the crank position sensor? That's a fairly common problem area on the 320 V6 and could account for your symptoms.

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post #13 of 15 (permalink) Old 09-12-2007, 02:41 AM
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Not much help But here we go.

I remember seeing a post here refering to the wiring to the coils failing/shorting something?? I can't remember....... I remember it was a 320.. Have you done a search for ML320 coils, wiring, etc. I know thats not much help but vaugely remember it and they included fix in post.
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post #14 of 15 (permalink) Old 09-13-2007, 06:48 PM
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he did not retrian where the crank shaft sensor is.there is no such thing. i bet he reset adaptaions for the mass air flow sensor. what you discribe is exactly what happens when some one replaces a maf and does not rest computer. was this a mb dealer that changed the maf? was it the same person that "reset" the crank shaft sensor. the ME(brain of car) either gets a signal or doesnt from the sensor. if the sensor goes haywire then it needs to get replaced not "reset".
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post #15 of 15 (permalink) Old 09-13-2007, 08:50 PM
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yes you can reset adaptation of the crank sensor

it is called ring gear adaptation and you do it when you replace the crank sensor or motor mounts
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