Coil missing ?

cloumar

Petty Officer 1st Class
Joined
Aug 12, 2002
Messages
305
Is it possible that a coil CDM will be missing (surging) at time on Force 1998 - 75-HP ?<br /><br />My 75HP will kind of missing at top end or load and worst sunday it was raining and damp, so in the morning it was running not too bad but later on the lake engine had rough idle and sounds like missing and stalling at idle - at top end I was barely reaching the 5000-rpm.<br /><br />Two weeks ago this motor was flying and roaring like a cat at idle. I made the ohms test on the 3 coils a bit difference with the #3 the same with plug #3 it was more dirty with oil and bit carbon buildup on tip ( plugs are 2 weeks old ).<br /><br />Thanks<br /><br /><br />Smokey ;)
 

WillyBWright

Fleet Admiral
Joined
Dec 29, 2003
Messages
8,200
Re: Coil missing ?

Do you have an inductive pickup timing light? Attach it to the sparkplug wire you suspect and go for a test ride. Tape the trigger on and lay it someplace you can keep an eye on it. You'll see any misfiring. Now for the fun part. It might not be that CDM that has failed. It could be any of them. They kinda feed off eachother and one can fire and cause another not to. :eek:
 

cloumar

Petty Officer 1st Class
Joined
Aug 12, 2002
Messages
305
Re: Coil missing ?

Thanks Willy, so in other words if I suppect that the spark is my problem, which I am almost sure because at idle the engine was kind of cutting out severly before stalling like a spark miss, I better change the 3 coils ?? :( <br /><br />Smokey
 
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