"The IC module is in the distr
"The IC module is in the distributor. Remove the cap and it's the plate with the two ports on it for the harnesses. It's available at any auto parts store or GM dealer.
Also, don't use starting fluid- get an empty mustard bottle and squirt some gas into the throttle body. The bottle won't usually leak when the tip is closed (assuming it's very clean) and the gas is less explosive.
Make sure the distributor is well grounded. Loosen the hold-down and clean the metal it mates with, then put some grease on the clean surface.
The DTC port in at the rear of the motor (usually the driver's side) and to make it easier to get to, release the gas shocks for the motor box cover and lay it back onto the floor or maybe a PFD. Slide the plastic cover off and look for the A and B terminals. It's the same port as in a GM car or truck.
Where are you located? If you're in PHX, Mastercraft of AZ is a good dealer and if you just don't like the MC dealer near you (in Southern CA, I can understand this- my cousin has had a bad time with that one) you can go to any Indmar servicer for parts and advice. Again, go to
www.tmcowners.com for more links to threads that may apply to your boat. Someone on that forum is bound to be near you and you may even know some of them already.
While it's possible for the ECM to go bad, it's unusual. He needed to go to the '96 version because there aren't any '94-'95 units available. You can't, however, go easily to anything newer because they changed the relay trigger outputs to negative and went to an internal knock sensor module, so the harness would have to be modified. Still possible, though.
If you have a multi-meter, check the green/white wire going to the fuel pump relay for voltage while cranking and for two seconds when you turn the key to ON. Another thing I just thought of is the pickup coil in the distributor, which may be going bad."