No spark while cranking

Kawaryan

Recruit
Joined
May 29, 2021
Messages
2
Hello,I have a 1996 mercruiser 5.7lt with thunderbolt ignition system.the boat sat for about 3 months,so I cleaned the carb and changed plugs,coil,rotor and cap.it was running fine untill recently and now I can't get it started.theirs power to the coil but no spark while cranking, it tries to start when I release the key on the ignition.i have gotten it started with this problem but it's hit or miss.would it be a faulty module?.I'd appreciate any input.thank you.
 

dubs283

Vice Admiral
Joined
Jul 27, 2005
Messages
5,343
might be the module but most suspect for no spark on a thunderbolt is the ignition sensor in the distributor
 
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