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Old 05-24-2018, 07:11 AM
Procraft176 Procraft176 is offline
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Boat: Mastercraft, 1985, 351 windsor
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Location of ignition control module on a 85 model

Hey all, new here. My boat has a couple of issues. One is sometimes it starts after I let off of the switch. I've already put a brand new switch in. Second problem is when it gets to operating temp it won't crank until it cools down. It will turn over, but won't start. It has been converted to electronic ignition already. I had a guy tell me it was my ignition control module. Where is that at? I can't find it. Looks like it may be inside my distributor. Also what is the chance it might be vapor locking? It has about a foot or so of metal gas line, before it changes over to rubber Hose. Any help will be greatly appreciated. Thanks in advance!!
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  #2  
Old 05-24-2018, 07:59 AM
Strreamline Strreamline is offline
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Boat: 1988 Mastercraft Platinum Prostar 190
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For the crank issue, most likely the starter solenoid sticking if you've already replaced the ignition switch. small black module located at the back on the engine above the transmission with battery power connections. easy swap.
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Old 05-24-2018, 08:15 AM
Procraft176 Procraft176 is offline
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Boat: Mastercraft, 1985, 351 windsor
Location: Southeast
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Thanks for the info, I will look into that. The starter turns fine when I turn the key. It just won't fire up until I release it most of the time.
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Old 05-24-2018, 10:35 AM
Strreamline Strreamline is offline
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Boat: 1988 Mastercraft Platinum Prostar 190
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Oh I misunderstood. I thought you meant it kept cranking after you released...youre talking long crank time?
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Old 05-24-2018, 10:43 AM
Procraft176 Procraft176 is offline
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Boat: Mastercraft, 1985, 351 windsor
Location: Southeast
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Yea it has been a bit of a head scratcher. The biggest thing though is it not cranking when it gets to running temp. It will turn over fine, it just won't crank untill it cools off. What's the chances of it vapor locking?
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  #6  
Old 05-24-2018, 11:04 AM
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paco_06 paco_06 is offline
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Boat: 1993 prostar 205 previous 85 S&S
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Battery cables, cable ends, or battery. I fought this exact issue for years on my previous boat. The reason it cranks after releasing key is at that split second, it has enough voltage for the electronic ignition to operate. When my boat was warm, seemed to be worse. Guess a warm starter needs more amps?

Anyways, depending on how old you think they are, I'd just replace both cables and clean your ground to the block.

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  #7  
Old 05-24-2018, 11:52 AM
88 PS190 88 PS190 is offline
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Sometimes you can troubleshoot these things by bringing an accessory ground as well, just a jumper cable from the battery negative straight to the block and see if it improves the scenario.
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Old 05-24-2018, 01:27 PM
Procraft176 Procraft176 is offline
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I will definately look into yalls advice. Thank you
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Old 05-24-2018, 01:31 PM
Procraft176 Procraft176 is offline
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Boat: Mastercraft, 1985, 351 windsor
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Do you think my ignition control module might be going bad as well on the no start issue after it heats up?
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  #10  
Old 05-24-2018, 04:30 PM
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ahhudgins ahhudgins is offline
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If you or someone has done an ignition upgrade by just removing the points, the ignition module is what replaces the points and is under the distributor cap.

If the starter is turning the engine over (cranking) but it the engine doesn't start, you need to check for spark at the plug wires AND see if you are getting gas into the carburetor.
You need to see which one (or both) that you are missing.

If you are saying the engine only starts when the key is released to the RUN position, it sounds like you have some wiring issues with the ignition switch and the wiring. Did this problem start before or after you replaced the ignition switch?
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