Motor details - s/n: 1B547028 MERCURY 250DFI L PROXS
So finally got my buddies boat out on the water after replacing the fuel filter & adding fresh gas ( 5 gallons ) with a double dose of lucas fuel injector cleaner.
Boat was lazy to get on plane, no misfire, top speed of 43mph, ranger 520abc?
the only time the motor sounded odd, was after putting the motor into gear - barely applying throttle. it didnt misfire, but there was no fury or anger coming from the motor... just weak & kinda struggling.
anyways, after burning fuel, numerous stopping, getting back onto plane, all improved but is still lacking top speed at = 56 mph.
following day did a cold compression test, he brought the boat to my house with tools, 5 @ 90psi, 1 @ 85 psi. by the 3rd revolution the psi was achieved.
upon this inspection i noticed some oozing out of coil #3
So i asked a buddy who has a merc manual & he sent me some images on how to pin-out / test the coils.
besides going thru the ohm procedure, is there another way to test the 5 remaining coils?
here is the link to the original thread / inquiry https://www.bbcboards.net/showthread.php?t=1198419
Thanks & have a wonderful new year!
cracked coil.jpgcoil pin out_1.jpgcoil pin out_2.jpg