americaneagler77
Petty Officer 1st Class
- Joined
- Jun 15, 2011
- Messages
- 231
quick overview.....1987 merc 70 3cyl 2 stroke, been fighting this problem since end of june.
on cold starts, i often loose spark on the top cylinder, it seems when i move or trailer the boat (TRIM UP) i loose the cylinder,
so first i replaced plugs and wires. boat ran great while kept in the water for a week. took it home, the problem is back. if i jiggled around the plug wire etc it would often come back to life...
next i replaced the coil on that top cylinder, fired up the boat on the muffs, she runs well, all 3 cylinders firing, i think i fixed it, take it to lake 60 miles away, same problem, tried 3 different plug wires, jiggled around etc, no fix, took apart again, traced all wires, everything looks good, try to run it again, same problem, top cylinder is dead cold. back on trailer she goes.....this is where im at now.
NOW i plan on running it in the bucket or on the muffs to test and see if the top coil is getting juice from the switchbox or if the problem is now well before the coil or indeed the new coil itself. what could this possibly be and why. jiggling and tapping no longer brings the cylinder back to life, the top cyl appears dead. PLEASE HELP
I would really like to get this running right and enjoy it a couple more times, but i have my son due in november, so im half tempted to winterized it and forget about it until spring....and move on the more important issues, but i have to at least test and see if the coil is getting power
on cold starts, i often loose spark on the top cylinder, it seems when i move or trailer the boat (TRIM UP) i loose the cylinder,
so first i replaced plugs and wires. boat ran great while kept in the water for a week. took it home, the problem is back. if i jiggled around the plug wire etc it would often come back to life...
next i replaced the coil on that top cylinder, fired up the boat on the muffs, she runs well, all 3 cylinders firing, i think i fixed it, take it to lake 60 miles away, same problem, tried 3 different plug wires, jiggled around etc, no fix, took apart again, traced all wires, everything looks good, try to run it again, same problem, top cylinder is dead cold. back on trailer she goes.....this is where im at now.
NOW i plan on running it in the bucket or on the muffs to test and see if the top coil is getting juice from the switchbox or if the problem is now well before the coil or indeed the new coil itself. what could this possibly be and why. jiggling and tapping no longer brings the cylinder back to life, the top cyl appears dead. PLEASE HELP
I would really like to get this running right and enjoy it a couple more times, but i have my son due in november, so im half tempted to winterized it and forget about it until spring....and move on the more important issues, but i have to at least test and see if the coil is getting power
