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I have a 1996 31′ Custom Carolina Express with twin Cummins 4BT 3.9 – 140 HP (both 1996 with 500 hours). I have had the boat a little under a year.
A couple months ago, the port engine began having trouble cold starting (starboard engine starts on first turn of key). I would have to turn the key, 5-10 seconds each time, multiple times while having to rev the throttle to get her going, but it always starts (eventually) and once it is warmed up, it starts at first turn of the key. I do not believe the issue is a cold block (I live in Virginia and winter has been mild this year) because I was having the starting issue when the outside/water temps were above 70 F. I also have a bilge heater to keep the engine room above 40 F.
I have changed air filter, and primary and secondary fuel filters. Oil filter is new and the appropriate amount of oil is in the engine. The battery voltage appears fine and the other engine will start right up. The port just cranks, like it is trying to start, but takes multiple attempts and i am afraid to burn up the starting solenoid.
I am thinking maybe something to do with fuel supply or compression, but what are some other troubleshooting ideas that I can mess with to fix the cold starting issue?
Thanks
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