85 Mercruiser Ignition problem

M

MichaelRiver141

Recruit
Joined
Sep 23, 2009
Messages
3
I pulled my boat out of storage. The port engine starts and runs. It is only running on 4 of 8 cylinders. Everyother spark plug lead coming off the distributor is dead. I cleaned the distributor cap. But there is still no spark to everyother sparkplug wire. Where do i start with troubleshooting? Any suggestions?
 
M

Maclin

Admiral
Joined
May 27, 2007
Messages
6,761
Re: 85 Mercruiser Ignition problem

That sounds like the spark plug wires are not in the correct order on the cap to me. That would not happen while it was in storage though. Was it just running rough when you fired it up and then you cleaned the cap? and maybe put them on backwards?
 
M

MichaelRiver141

Recruit
Joined
Sep 23, 2009
Messages
3
Re: 85 Mercruiser Ignition problem

I cleaned the cap with the plug wires intact in cap. There was minor corrossion inside the cap.
 
zbnutcase

zbnutcase

Commander
Joined
Sep 19, 2009
Messages
2,055
Re: 85 Mercruiser Ignition problem

Check to make sure a V6 trigger wheel didn't get installed. 'nutcase
 
Apollo75

Apollo75

Petty Officer 1st Class
Joined
Sep 2, 2009
Messages
272
Re: 85 Mercruiser Ignition problem

Weird --- but, if you are sure it is every other plug wire ---- I would look at a tack problem or module.


OFM
 
M

MichaelRiver141

Recruit
Joined
Sep 23, 2009
Messages
3
Re: 85 Mercruiser Ignition problem

We are going to go check everything over again in the morning. This sure has stumped alot of boat mechanics. I have gotten responses from change all the spark plugs, wires, coil, distributor cap and rotor. Because of my 13 hour work day a mechanic is meeting me at the boat at 6am before he starts his regular hours. He is pretty confident he will be able to diagnose the problem quickly. I'll let you all know what he finds. Thanks for all your help and suggestions.
 
You must log in or register to reply here.
Top