04 saltwater 90 hp ignition ot coil problems

I have read through all the FAQ, Stickies and posts, but can't find any info on the symptoms my boat has.

So i decided to post cause, I am still trying to figure out whats going on with my motor. The other day I was out on a river after running for about 2 hrs it started losing power (usually does 46mph) and would run like it was a 50 horse (about 25mph)then kick on for about 1 to 5 seconds then back off and continued doing this. I checked gas lines and chenged fuel filter. With no succees. I was on the water today and I dis connected one coil pack at a time to see if I could figure out the problem. With the top coil disconected it wouldn't start at all. the middle it ran rough and surged like with all connected only even less power. When I disconnected the bottom coil it started and ran smooth just underpowered (went about 30mph). When I conected it back up it would start worse and run worse unless it was having a 1-5 second surge. My question is does it sould like the one coild is bad and draining the ignition system or do you guys think that the ignition system itself is not performing up to par and getting drained to much to run all coils? I also read another post that said a boat had a bad stator could that cause the same problems?

any help would be greatly appreciated.

Joe

Re: 04 saltwater 90 hp ignition ot coil problems

Any Ideas??

Re: 04 saltwater 90 hp ignition ot coil problems

Bad CDM module...testing below CC'd from CDI electronics.....

No fire or Intermittent on One or More Cylinders:
1. If the cylinders are only acting up above an idle, connect an inductive Tachometer to all cylinders and try to isolate the problem cylinders.
2. Using a set of piercing probes, check the trigger DVA output as given below:
Wire Color Check to Wire Color Resistance DVA Reading
Purple wire Engine GND Open 1V or more
White wire Engine GND Open 1V or more
Brown wire Engine GND Open 1V or more
NOTE: These triggers have the bias circuitry built into them, therefore you cannot measure the resistance like you could the older engines. In addition,there are four triggering coils used.
3. If # 1 is not firing, disconnect #2 CDM module and see if the #1 module starts firing. If it does, the module you just unplugged is bad. If it does not, disconnect #3 CDM module and see if the #1 module starts firing. If it does, the module you just unplugged is bad.
4. If # 2 or #3 are not firing, swap locations with #1 and see if the problem moves. If it does, the module is bad. A continued no fire on the same cylinder indicates a bad trigger.