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I apologize a head of time bc I currently do not have my serial number bc my boat is at the dealership again.. It is a new 250 pro xs v8 4 stroke on my new 2020 Cayams cx20 pro. I've had intermittent missing issues off and on since the first time I've put it on the water. (It now has 30 hrs.) Sometimes it has been very slight and here recently it has became pretty severe. It has went several hrs without a hiccup and occasionally would have a slight miss throught out the rpm range. I've had a certified Mercury tech check it out and said he found nothing. Took it back and had a mercury "master tech" check it out and he said he found nothing. The motor has several times threw a non critical 6 beeb code.. Does this code not get logged??
Anyway with my total frustration it has became worse. I am an senior instrumentation and control tech, and troubleshoot complex machine controls and programming issues everyday. I brought it home today after the Master tech said he seen no issues. I pulled the plug wires from the plugs and inspected all looked to be normal. I did however pull the other end of the plug wire at the coil end and noticed on 3 of the 8 they look like the picture below.
Screenshot_20200619-185244_Gallery.jpg
The end of 3 coils looked like this..
Screenshot_20200619-185239_Gallery.jpg
To me it appears i have 3 plug wires that have issues.. If you ook closely you can see carbon marks in both pictures. Meaning the plug wire is not making a good connection to the coil. Again i took back to the dealership today and showed them my findings. The same day I picked it up and was told there was no issues. I sent them a video of how it ran today right after I picked it up. They have always took care of me in the past and I'm sure they will again. Its just frustrating after a major purchace I made and 2 trips to the same place with 2 different trained eyes looking at it and didn't notice anything. Again Don go ahead and tell me to view the forum announcements at the top of the page. If I had the boat in my possesion I would definatly have it. Thanks for any help and I hope this thread may help someone else if they have a simular issue.