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No Spark

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Old Feb 11, 2014 | 06:14 PM
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rocks rocks's Avatar
rocks rocks
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C280
No Spark
Out of the blue my 97 c280 back fired three times and cel came on. The car ran rough at slow speeds but fine at high speeds. When I got it home I checked the codes po302 came up. So I changed the all plugs and all went well for a week until it back fired again. This time I put in platinum plugs not a good idea. I checked codes again and got these po 306/304/302 and po206 came up. As I was replacing the plugs back to copper I noticed #3 and #6 cylinder plugs were clean. No fire.
Thanks for any Ideas
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Old Feb 12, 2014 | 10:15 AM
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u001elg's Avatar
u001elg
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2006 ml350
I would start with checking the condition of the coils and wires.

A weak coil(s) and/or leaking wire(s) could easily cause those symptoms
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Old Feb 12, 2014 | 10:35 AM
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rocks rocks
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C280
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I did check the coils, the main shaft of the coil is firing. but the side where the plug wire is connected to the other cylinder is not ??
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