Johnson 150 spark issues

pioneer11

Seaman Apprentice
Joined
May 22, 2013
Messages
38
Johnson 150 95.

My problem is the cowl seal wasn't on correct and when I was running my boat on the weekend it ran great until we slowed down and the water came pouring over the back of the engine.

It started misfiring and would not produce any power. I pulled the cowl wiped off the spark plugs, when I pulled the wires drops of water came out.

That only worked for a couple of times but now it has no power and has a miss.. It will start up fine but I can here it missing and just don't sound right

My question is, is it just wires or did something else get wet? I pulled the coils and the bottoms of them all have cracks in the rubbers.

Just put new plug wires on it and no change... hooked an old plug to it and it does have blue spark

Is the power pack a sealed unit? I am just wondering maybe that got wet is there a way to test a coil?
 

Chris1956

Supreme Mariner
Joined
Mar 25, 2004
Messages
28,163
Re: Johnson 150 spark issues

Gee, wasn't this thread submitted exactly this way some days ago?

Power pack should be sealed. Replace any cracked powerpacks, cracked coils or cracked boots. It is hard to accurately test cracked coils, as they can arc to ground under load or internally short.
 

pioneer11

Seaman Apprentice
Joined
May 22, 2013
Messages
38
Re: Johnson 150 spark issues

Hey yes sorry I added some more info In this post. Turns out it's not a spark issue. Fuel restriction.
 
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