I have a 99 VP 5.0GL and yesterday had odd ignition issues. I think the coil but wanted some other advice.
Boat ran great for ~30 minutes then would notice it would feel like it would drop cylinder or two in low speed no wake areas, would run OK on plane (might have been slightly down on power, was hard to tell, if it was not by much). As boat ran longer ran worst. I noticed when I ran the trim pump to trim up or down would change the way it ran, usually would run smooth. (weird huh). I had a small tool kit along and ran a 12+ wire directly to battery to by pass boat wiring, switch etc. thinking it might be voltage problem to battery (bad connection, high resistance deal). Ran exactly the same with boat wiring by-passed. Weird, not boat wiring then. We stopped for lunch threw anchor and ate lunch, when boat cooled ran OK for 30 minutes again then same progression is poor running. Stopped again to chill and swim in cove, boat cooled off and ran fine for a while to get us back to ramp, was starting same deal when we got to ramp. Got home (boat had cooled on trip home) and fired right up to flush it, all 8 cylinders sounding fine. I would think coil all day long, but why the heck would the trim pump have effect???
The boat has what appears to be standard cylindrical ignition coil, I wonder if it it is marine specific in case nobody has VP part locally.
Sorry for the very long post.
Boat ran great for ~30 minutes then would notice it would feel like it would drop cylinder or two in low speed no wake areas, would run OK on plane (might have been slightly down on power, was hard to tell, if it was not by much). As boat ran longer ran worst. I noticed when I ran the trim pump to trim up or down would change the way it ran, usually would run smooth. (weird huh). I had a small tool kit along and ran a 12+ wire directly to battery to by pass boat wiring, switch etc. thinking it might be voltage problem to battery (bad connection, high resistance deal). Ran exactly the same with boat wiring by-passed. Weird, not boat wiring then. We stopped for lunch threw anchor and ate lunch, when boat cooled ran OK for 30 minutes again then same progression is poor running. Stopped again to chill and swim in cove, boat cooled off and ran fine for a while to get us back to ramp, was starting same deal when we got to ramp. Got home (boat had cooled on trip home) and fired right up to flush it, all 8 cylinders sounding fine. I would think coil all day long, but why the heck would the trim pump have effect???
The boat has what appears to be standard cylindrical ignition coil, I wonder if it it is marine specific in case nobody has VP part locally.
Sorry for the very long post.
