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7880 hp mercury

B

Bill Felder

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"while turning the engine over

"while turning the engine over i checked for spark at the spark plug wire and all four are sparking.i can start the engine,but it is skipping.i checked spark at same location mentioned above and the 2 top plug wires are firing but the bottom 2 are not.i swaped the #1 and #2 coiles with the #3 and #4 coils and it did not make any difference.the top two plugs are firing and the bottom 2 are not.i checked the wiring from the switch box to the coils,all seem fine.i am thinking switch box or the stator.how do i check these items?any suggestions would be great except take it to a shop.my wife says no more money will be spent on this boat and motor and i don't see me getting another one.help PLEASE,Thanks in advance,Bill"
 
"anybody out there> help p

"anybody out there> help please.any guess would be great,it would be better than what i am trying.thanks in advace,Bill"
 
"Stator is apparently working

"Stator is apparently working (#1 and #2 firing).
Also try to swap the trigger sensors. If still the same result, I would suspect switchbox.
Robert"
 
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