502 mpi running on 4 cylinders
 

Ran the boat today made a couple laps at WOT, headed back and it hiccuped so I backed out of the throttle then started running like s*** after putting a new cap and rotor and a coil still running the same

After some trouble shooting 2 cylinders are down on th port and starboard side

Port side cylinders 1 and 7 are down
Starboard side cylinders 4 and 6 are down

Any ideas? I'm thinking a distributor but not sure

sound like an injector wire feed from ecu went bad.

So is that the injector harness that runs cylinders 1746?

sounds like it.there are 2 driver circuits from the ecu.also check the 12v feed to them also.

Ok will do

How would I test these? And where

at the injector w/ a noid light.

I am looking at my wiring harness for another problem but you might check your grounds. There are 3 grounds on the injection harness alone. Randy

It's weird it was running great then it hiccuped and has run on 4 cylinders...they just all of a sudden go?

I just checked the spark and it does have spark on all cylinders