PLEASE IGNITION HELP 1985 mercruiser 170 3.7L!!!!!

matos1989

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Sep 6, 2011
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Alright so my mercruiser starts just fine, but after tuning it for about 5 min in the water the ignition gets very very hot to the point where u can't even touch it. And then it cuts off and wont start for a couple days...Wat shout I do? From Wat I hear is that there's an electric ignition upgrade for it but I dunt know much about it. I need an advice on Wat to do about the ignition? Or if the problem is the ignition? Help help!!!!:confused:
 

Oshkosh1

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Re: PLEASE IGNITION HELP 1985 mercruiser 170 3.7L!!!!!

When you say "ignition"...that's more of a system, than a component.

Are you talking about the ignition COIL??
 

matos1989

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Re: PLEASE IGNITION HELP 1985 mercruiser 170 3.7L!!!!!

Yea ignition coil....sorry
 

Oshkosh1

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Re: PLEASE IGNITION HELP 1985 mercruiser 170 3.7L!!!!!

Sounds like the coil is bad...however in order to make sure there is a procedure to test it. It's pretty straight forward...search on "Coil testing"...or something along those lines. If you have a manual(SELOC or the like) it will guide you step by step and have the resistance values.

However my GUESS would be that the primary winding inside of it has gone bad...time for a new coil.
 

matos1989

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Re: PLEASE IGNITION HELP 1985 mercruiser 170 3.7L!!!!!

i will try that first thing tom and il keep u updated it thankx
 

matos1989

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Re: PLEASE IGNITION HELP 1985 mercruiser 170 3.7L!!!!!

I recall that. the coil is new the ignition/distributor is Wats getting hot. Is actually my dads boat and im trying to help him out cus he doesn't know much about online chatting. But I just ask him if he change the coil, and he said yea, but the Agni/distrib is getting ferry hot
 

Oshkosh1

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Re: PLEASE IGNITION HELP 1985 mercruiser 170 3.7L!!!!!

Pull the cap and look at the points/condensor.
 
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