Pro Max 300 will not start

HPina65

Recruit
Joined
Jul 31, 2013
Messages
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I have a 99 Pro Max 300 that won't start. I worked on it for a month with no luck. I went through every diagnostic in the service manual and they all passed. I gave up and took it to a local marina which is Mercury certified. They have had it for almost 6 weeks now and they can't figure it out. Here's the details:

Injectors are not firing
When you remove the induction system the injectors will fire manually
Plug a noid light into the harness and it does not light up
It is not the computers (they took the computers -fuel and ignition- off a running 225 and no change
All the ohm readings on the injector harness pass

Boat ran like a dream last year.

Thanks in advance...
 
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