premature distributor corrosion-wear

[cunuck]

my distributor cap is fouling gray green after 1 hour. New cap changed it a month ago first time out today , idle not bad but no high rpm or power .plugs great timing spot on why so quick to foul (coil ?) boat 220 hrs 2400scr 5.7 merc

[cunuck]

Looks like a weak coil as it heats up will mess with the cap & rotor and cause miss fire .

[TonyA]

hi Cunuck what was wrong with the old cap, did it have the same Gray/green on it , is the gray /green a carbon build up or more like corrosion, did you do anything else or just change out the cap, did you replace the casket between the cap and disy body. sorry about all the questions but green on boats seems to point to corrosion and if you have reset the timing, there is a special way of doing it, not just putting a timing light to it and shift the dizy around.
Like to here what you fined Tony

[cunuck]

new cap & rotor with new gasket yes green but pitting after 1 -2 hours checked timing in base mode and it was spot on.the new coil seems to have fixed but I will test under load wed or thur to be sure and post results.cunuck

[TonyA]

Good to here that you set the timing as per the mercruiser instructions, because if it’s not done properly the electronic module will not advance the timing and you end up with low RPM and HP. I have also seen pitting created by a reverse polarity on coils, have you checked to see if the + lead is on the + terminal of the coil just a though