w140 BAD IGNITION COIL?? - Mercedes-Benz Forum

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post #1 of 1 (permalink) Old 07-06-2011, 10:05 AM Thread Starter
BenzWorld Junior Member
Date registered: Jun 2011
Vehicle: w140 400se mercedes benz
Location: california
Posts: 7
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Exclamation w140 BAD IGNITION COIL??

hey everyone new to site long time reader. this is my second benz 1992 400se. alright so my benz shakes when cold then starts to misfire and idle high around 1500rpms when warm. i narrowed it down to a couple things spark plug wires or coils. my car has 2 coils i disconnected 1 coil the car dies(replug coil). turn car back on then i disconnect the other coil the idle sort of moves down but car doesnt die!! is it bad coil? the car idles high shakes and shakes harder in park or reverse. maybe wires? just put new plugs made it better but still problem. misfire is not so bad after plug change.
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