Reply To: 1956 Johnson 30hp Only 1 Cylinder Firing

[Buccaneer]

rhalbert10@outlook.com wrote:

How 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!