6o efi mercury 4 stroke sparkplug wet

[shaki6]

My father has a 60 hp 4stroke EFI Mercury engine for his pontoon.I think he bought it in 2003,the problem is one sprarkplug is always wet,he has had the power head changed,think's has the coils replaced and other work done on it also.

My question is is there something we didn't see, does someone have any possible answers.

 

[JB]

Re: 6o efi mercury 4 stroke sparkplug wet

How does it run?

A wet plug might be a symptom, but it is not a problem.

Because the engine turns over a time or two AFTER the ignition is turned off it would be normal to expect at least one cylinder to have unburned fuel in it.

Give us some more info, please.

 

[shaki6]

Re: 6o efi mercury 4 stroke sparkplug wet

Here's the thing, he puts in a new sparkplug goes for a ride comes back and its wet,seems the motor is running rough and burns fuels faster than normal.

The engine only runs on three cylinder.

 

[JB]

Re: 6o efi mercury 4 stroke sparkplug wet

Okay. Consider the wet plug a small clue.

Troubleshoot the rough running.

Is that cylinder making power? What happens to the idle if that plug is disabled?