1998 evinrude intruder. blue arching on bottom two cylinders

[stratosfear1971]

I was running my boat on the lake,everything was going fine.
I stoped my boat to fish and started it up agian and it was running really rough and hard to get on plain.
I went home and checked various things on it.
I noticed in the dark that the two bottom plug wires where arching from the boot to the plug. Well I replaced the plug wires, no fix. I replaced the plugs, no fix. I switched the coils around to see if it was one of them. no fix.
Does any body have any advice on this matter, Im stumped and dont know what else to do and im not even shore if this is the cause of the problem, but i think it might bebecause i did here spark knock on the motor going back to the boat ramp.

 

[Chris1956]

Re: 1998 evinrude intruder. blue arching on bottom two cylinders

Strange issue. Make sure the spark plugs have the correct gap, the boots are clean of oil and water. Make sure to wipe off the head where the plug grounds itself. See if there are any broken ground wires from the block to the cowling, and repair them. My old merc used to have 4 large straps to ground the block to the cowl.

 

[ezeke]

Re: 1998 evinrude intruder. blue arching on bottom two cylinders

Swap your sparkplugs around; if the ceramic is cracked from dropping or tool abuse, the plugs will arc. You may not be able to see the cracks, but the problem will follow the plug if it's there.

Check the holes for helicoils; they sometimes have poor contact which may worsen over time.

Make sure that you are using solid core wires, not automobile wires, and that the clips are firmly connected to the wires.

 

[stratosfear1971]

Re: 1998 evinrude intruder. blue arching on bottom two cylinders

Strange issue. Make sure the spark plugs have the correct gap, the boots are clean of oil and water. Make sure to wipe off the head where the plug grounds itself. See if there are any broken ground wires from the block to the cowling, and repair them. My old merc used to have 4 large straps to ground the block to the cowl.

thx for the response. i have tried all of the above with no luck. could it be the powerpack possibley or somthing else?

 

[stratosfear1971]

Re: 1998 evinrude intruder. blue arching on bottom two cylinders

Swap your sparkplugs around; if the ceramic is cracked from dropping or tool abuse, the plugs will arc. You may not be able to see the cracks, but the problem will follow the plug if it's there.

Check the holes for helicoils; they sometimes have poor contact which may worsen over time.

Make sure that you are using solid core wires, not automobile wires, and that the clips are firmly connected to the wires.

thx ezeke for the reply. I have tried all of that could it be somthing else like the powerpack?