So I posted a couple of days ago, see below. Still have the stumble/rough idle, like it is missing. It runs smooth above 1200 rpm, #3 Cylinder plug is oily, checked coils and they are all spec. Compression is #1 140, #2 138 and #3 130 (cold did not test warm). These all seem to be within 10% and above spec? When you pull the plug wire, it barely changes the idle, it has spark and the coil was switched to a new one. So I am at a loss of what to check next. I am thinking #3 carb is messed up. So I plan to pull it and check it. VRO is disconnected and I am using the fuel side. But I would think this would effect all cylinders and carbs, correct? My next line of thought is the power pack, have not been able to test it. Is it possible that the power pack is not throwing enough power at the #3 plug, but works fine for #1 and #2?
Any ideas experts????
Thank you
Here is what I posted:
1992 Johnson 60hp, VRO disconnected (mix the fuel) Went to the lake today, motor would not start. Ran great the last 3 days. Getting fuel but had no spark on all 3 cylinders. Switched batteries (new deep cycle for trolling, so good battery) just to be certain that was not the issue. Still no spark, fuel mix draining out of exhaust. Tested kill switch, works properly. Brought it home, put batteries back in regular locations, made sure it was all good and tight. Boat started, but was running rough, pulled plug wires to see if it had spark, #1 top cylinder good (engine tried to die, but could see really strong spark), #2 middle good (ran rough, could see really strong spark), #3 bottom no spark (no change to engine running, no visible spark)
Switched coil #3 with coil #2, problem followed coil. So now I was thinking power pack,but but not sure that a power pack would or could cause intermittent spark. So switched spark plugs and problem went away, but still runs a little rough. The rpm will drop everyonce in awhile but not all the time. When you give it gas and run it up to 1K-1500K RPM, it goes away. Did not try to go in higher, running on water muffs.
Can I check the power packs? Resistance, etc. . . to see if one is bad, but still good enough to cause a spark? Can I check the Power Pack, would it cause one coil to fire intermittently? I am curious to why it would not fire at all and then all sudden ( with me messing with the batteries) it started. Any ideas?? I was doing some searching on here, and came across an issue with an of rough running, due to VRO pump diaphram wearing out. But since the pump just feeds the carbs and the carbs feed each cylinder, does not sound feasible. Carbs were just rebuilt back in February.
Any ideas experts????
Thank you
Here is what I posted:
1992 Johnson 60hp, VRO disconnected (mix the fuel) Went to the lake today, motor would not start. Ran great the last 3 days. Getting fuel but had no spark on all 3 cylinders. Switched batteries (new deep cycle for trolling, so good battery) just to be certain that was not the issue. Still no spark, fuel mix draining out of exhaust. Tested kill switch, works properly. Brought it home, put batteries back in regular locations, made sure it was all good and tight. Boat started, but was running rough, pulled plug wires to see if it had spark, #1 top cylinder good (engine tried to die, but could see really strong spark), #2 middle good (ran rough, could see really strong spark), #3 bottom no spark (no change to engine running, no visible spark)
Switched coil #3 with coil #2, problem followed coil. So now I was thinking power pack,but but not sure that a power pack would or could cause intermittent spark. So switched spark plugs and problem went away, but still runs a little rough. The rpm will drop everyonce in awhile but not all the time. When you give it gas and run it up to 1K-1500K RPM, it goes away. Did not try to go in higher, running on water muffs.
Can I check the power packs? Resistance, etc. . . to see if one is bad, but still good enough to cause a spark? Can I check the Power Pack, would it cause one coil to fire intermittently? I am curious to why it would not fire at all and then all sudden ( with me messing with the batteries) it started. Any ideas?? I was doing some searching on here, and came across an issue with an of rough running, due to VRO pump diaphram wearing out. But since the pump just feeds the carbs and the carbs feed each cylinder, does not sound feasible. Carbs were just rebuilt back in February.
