scottkanderson
Seaman Apprentice
- Joined
- Apr 13, 2005
- Messages
- 37
Hi, I have a1986 omc 4.3L with gm engine, stringer outdrive. It was running good, and then I changed the oil, plugs, plug wires, points, and cap. I checked the dwell before I started this and it was at 29, should be 39.
I put in new points and set the dwell to 39, changed the rest of the stuff, put 15 gallons of gas in it and went to the lake.
It started good and started to head out, sounded good until about 2500rpms, and then was running bad and would not go faster than 7 mph, as i gave it more gas, the engine got louder like it was trying to go faster but the rpms would not go above 3000 and ran really rough. Never would go faster than 7 mph. I put it in neutral and reved the engine and the same thing occurred at 3000 rpms, and would not go above that.
Took it home, tried the old plugs and wires, and same thing happened, checked dwell and it was still right at 39. Tried putting the dwell to 29 where it was when i started, and still the same problem. Could the timing be causing this much problem, I don't have a timing light, and have never messed with the timing in the 4 yrs I have had this boat.
When I was hooking up the starter switch I 1st hooked it up to the coil, and positive batter terminal, and pushed the button, I did this to both of the coil terminals before i realized that it need to be on the solenoid. Could this have messed up the coil? and if so, would it cause this type of problem?
I had a problem just like this one other time, someone at the lake sold me 10 gallons of gas out of containers, and it had the same exact symptoms. That time I just cruzed around the lake for 3 hrs and it finally started running good. This time it was gas from the station, so i don't think it was bad, but the other 1/4 tank in there was from last yr, but had been treated and was running good the other 3 times I went out this yr. Could have the new gas mixing with the old cause a problem? I always put in the lowest octane, but this time I put in the mid grade, but that should not change things.
Ok, what could cause this, timing? bad coil? or bad gas?
I put in new points and set the dwell to 39, changed the rest of the stuff, put 15 gallons of gas in it and went to the lake.
It started good and started to head out, sounded good until about 2500rpms, and then was running bad and would not go faster than 7 mph, as i gave it more gas, the engine got louder like it was trying to go faster but the rpms would not go above 3000 and ran really rough. Never would go faster than 7 mph. I put it in neutral and reved the engine and the same thing occurred at 3000 rpms, and would not go above that.
Took it home, tried the old plugs and wires, and same thing happened, checked dwell and it was still right at 39. Tried putting the dwell to 29 where it was when i started, and still the same problem. Could the timing be causing this much problem, I don't have a timing light, and have never messed with the timing in the 4 yrs I have had this boat.
When I was hooking up the starter switch I 1st hooked it up to the coil, and positive batter terminal, and pushed the button, I did this to both of the coil terminals before i realized that it need to be on the solenoid. Could this have messed up the coil? and if so, would it cause this type of problem?
I had a problem just like this one other time, someone at the lake sold me 10 gallons of gas out of containers, and it had the same exact symptoms. That time I just cruzed around the lake for 3 hrs and it finally started running good. This time it was gas from the station, so i don't think it was bad, but the other 1/4 tank in there was from last yr, but had been treated and was running good the other 3 times I went out this yr. Could have the new gas mixing with the old cause a problem? I always put in the lowest octane, but this time I put in the mid grade, but that should not change things.
Ok, what could cause this, timing? bad coil? or bad gas?
