S
shiftymagoo
Guest
I have a 89 Merc 5.7 carbuerat
I have a 89 Merc 5.7 carbuerated. I had a problem the other day where it started and idled but when I wanted to give it throttle it stalled and had a hard time re-starting. I thought it was flooded but once I got it started again I had a look around and noticed a bit of a misfire and then it stalled all together.
I took it off the lake and put it on the earmuffs and started it and was looking for the problem. I could rev it up some times and other times it would stall. then it would stall on its own with a slow death. Shortly before it would do this it would mis more often. After this it would crank but not fire or start.
Today I wanted to check to see it the coil was sparking and I didnt see any spark (tough to check by myself from up front). SO I replaced the coil and tried to fire it up.
It cranked a few times and then it did nothing. I started to second guess that I hooked up the terminal wires correctly and may have blown the coil. So I hooked up the old coil and had the same result ( no fuel pump cycle and no engine response). I tried re-arranging the terminals on the side I wasnt sure about with no change then I tried jumping a wire from the + on the batt to the + terminal on the coil and the fuel pump cycles.
I see that there looks to be a thunderbolt ignition module bolted to the manifold. I thought that this may be the culprit.
Did I fry the coil the module both or what.
I bought this boat with the this engine but it was originally a 305. Done by a marine dealer.
Your help is appreciated. Thanks
I have a 89 Merc 5.7 carbuerated. I had a problem the other day where it started and idled but when I wanted to give it throttle it stalled and had a hard time re-starting. I thought it was flooded but once I got it started again I had a look around and noticed a bit of a misfire and then it stalled all together.
I took it off the lake and put it on the earmuffs and started it and was looking for the problem. I could rev it up some times and other times it would stall. then it would stall on its own with a slow death. Shortly before it would do this it would mis more often. After this it would crank but not fire or start.
Today I wanted to check to see it the coil was sparking and I didnt see any spark (tough to check by myself from up front). SO I replaced the coil and tried to fire it up.
It cranked a few times and then it did nothing. I started to second guess that I hooked up the terminal wires correctly and may have blown the coil. So I hooked up the old coil and had the same result ( no fuel pump cycle and no engine response). I tried re-arranging the terminals on the side I wasnt sure about with no change then I tried jumping a wire from the + on the batt to the + terminal on the coil and the fuel pump cycles.
I see that there looks to be a thunderbolt ignition module bolted to the manifold. I thought that this may be the culprit.
Did I fry the coil the module both or what.
I bought this boat with the this engine but it was originally a 305. Done by a marine dealer.
Your help is appreciated. Thanks