2001 115 hp mercury 4 stroke EFI (SN OT341774)
new injector
new fuel
fuel pressure at 41psi
new spark plugs
new coil on 2 and 3
spark seem weak on cylinder 3 and 4
what I don't understand is 1 and 4 are on the same coil and 2 and 3 are on the same coil. Cylinder 1 and 2 fire fine?????
my understanding is that they both fire on compression and exhaust stroke..
no change i the engine when pulling 3 sparkplug wire off.
any help is appreciated
