Home › Forum › Ask A Member › 1956 Johnson 30hp Only 1 Cylinder Firing
- This topic has 23 replies, 9 voices, and was last updated 3 months, 2 weeks ago by John Gragg.
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July 3, 2024 at 9:10 pm #288836
Now that I have confirmed that both spark plugs are working, what are some of the thoughts from the community to try to help triage the situation?
Thanks in advance!
Rich
July 5, 2024 at 3:15 pm #288857Now that I have confirmed that the sparkplugs are working, any suggestions on a next set of things to explore?
Many thanks for all the help!
July 5, 2024 at 4:34 pm #288862point gap correctly is the cam on upside down?
July 5, 2024 at 7:30 pm #288878I have made no change in the cam in 3 years and it has been working fine that entire time
July 10, 2024 at 1:35 pm #289026Community: I am at a complete loss at what next steps to pursue so resurrecting this thread a bit. I did check that both of the sparkplugs are firing (and are both brand new). Looking for some thoughts on next things to try to see if I can resurrect the half of the engine that isn’t working. Any thoughts?
Rich
July 10, 2024 at 1:58 pm #289028Just want to review to make sure I haven’t missed anything or misunderstood. What you are saying is that both plugs are firing, but the engine seems to be running on only one cylinder? If so, have you figured out which cylinder is not functioning? I know it is tough, but a video (link would be fine as well) showing the engine misbehaving would be very helpful
July 10, 2024 at 5:41 pm #289035From the earlier post it seems that the feeling was that the “dry” sparkplug was the properly functioning one and the “wet” one was the suspicious one which corresponds to the bottom chamber. When I start the engine it sounds basically perfect – the only thing is when I get out on the water it basically travels at half speed and can never plane.
July 10, 2024 at 6:07 pm #289036Have you tried grounding out one sparkplug at a time while it’s idling to see if it’s
firing on both cylinders?Prepare to be boarded!
July 10, 2024 at 7:13 pm #289038How do I do that? Touch the sparkplug to the engine block while the engine is idling?
July 10, 2024 at 9:07 pm #289043How do I do that? Touch the sparkplug to the engine block while the engine is idling?
You have to find a way to short out the plug wire while attached
to the plug and with the engine running. If you notice a drop
of rpms when you short a plug out, you know that cylinder is
firing. Of course, that’s not to say it’s firing at higher rpms.You could pull the rubber boots off the plug wires and hook
the plug wires back up, then you’d have easy access to ground
the plugs.Prepare to be boarded!
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