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merc 3.0 xl/ddis

dave posten

New member
i have a 1991 glastron with a merc 3.0 lx/ddis. i was on the water about half throttle when i throttled back to nutral for a no wake zone. the boat stalled and will not start again. engine turns over but no spark at the plugs. im kinda lost as to what the problem mite be. any help would really be apreciated.
i have voltage with the key on at the distributor 9.8 vt, at the choke 9.8, coil resistance is 2.9 ohm.
 
This is the DDIS trouble shooting guide https://www.manualslib.com/manual/822660/Mercruiser-Gm4.html?page=45

I think you can see most of the manual for DDIS here https://www.manualslib.com/manual/822660/Mercruiser-Gm4.html?page=191#manual


The DDIS is distributor less and has a coil pack- one coil for each cylinder. Merc only made it for a few years. I had one on my 91 3.0. Never gave me an issue but because merc got rid of it so quick most parts are NLA.

if you need a coil pack or module the cheapest bet is to swap in a delco est distributor
 
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