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Old 08-16-2016, 10:54 PM
isaacdroster isaacdroster is offline
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Boat: Mastercraft Prostar 205 1996 LT1
Location: Midwest
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'96 Prostar 205 LT1 Engine Power Loss

I purchased a 96 Prostar 205 in March and it has ran great through the summer up until this past weekend. When I go wide open throttle, the boat planes out and run good for about 10 seconds and then the engine starts to lose power, but only for a split second at a time and then its back to running like it should. It does this about every 5 seconds in an irregular pattern. Eventually the engine will kick into what I believe is safe mode and wont go over 2100RPM's until I shut the engine off, and fire it back up. The check engine light has not come on yet.

So far I have
-replaced all the spark plugs
-replaced the fuel filter
-cleaned the fuel pump intake screen
-cleaned the battery terminals
-cleaned the engine ground
-cleaned the plug wires
-put a can of seafoam in the fuel tank
-checked to make sure tank was venting properly
-checked fuel pressure at idle (38 psi)
-checked fuel pressure when the boat goes into safe mode (about 44 psi)
-IACV was replaced at the beginning of the summer

I'm thinking about ordering new plug wires, and crank positioning sensors just to rule those out. Anything else I should try? I can't get the boat into a shop for a couple weeks and don't mind spending some money troubleshooting if it gets me back on the water sooner.

Thanks!
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Old 08-16-2016, 11:08 PM
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mikeg205 mikeg205 is offline
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Boat: 1995 Pro Star 205 5.7 Liter
Location: Plainfield - Joliet, IL
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check to see that fuel pickup not letting air in.. if the pickup has not been changed or refurbished - it's sucking air...
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Old 08-16-2016, 11:30 PM
isaacdroster isaacdroster is offline
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Boat: Mastercraft Prostar 205 1996 LT1
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Hey Mike how should I go about doing this? Pull the fuel pickup tube out of the tank and check it for cracks/leaks?
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Old 08-16-2016, 11:44 PM
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mikeg205 mikeg205 is offline
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yes.. this is the top of the fuel pickup - leaked air at 1psi.. get new nylon tubing and hi-tack sealant - and use a spring clamp.. you'll have to cut the ends of spring clamp to get to fit back into tank cover..
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Old 08-16-2016, 11:55 PM
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jakethebt jakethebt is offline
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Boat: '96 Prostar 205 LT-1
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Also of note, there are two fuel filters. One on top of the tank and a canister one on the back of the engine.
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Old 08-17-2016, 12:05 AM
isaacdroster isaacdroster is offline
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Boat: Mastercraft Prostar 205 1996 LT1
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Thanks for the replies, I'll check both of these after work tomorrow.
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Old 08-17-2016, 12:22 AM
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mikeg205 mikeg205 is offline
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I would also check fuel regulator - 20 years.. might be good check... or just replace - the cross reference part is in the library dropbox under general discussion..
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Old 08-17-2016, 12:50 AM
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mikeg205 mikeg205 is offline
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Also check the screen at the base of fuel pump.. its inside the inlet of fuel pump.. note the close off the fuel valve at tank and pinch fuel line - pump does not have power to suck gas from tank if hose drains.. if it does you will have to prime it.
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Old 08-18-2016, 09:06 PM
isaacdroster isaacdroster is offline
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There are two hoses coming off of the fuel tank, are both of them suppose to have pickup tubes going into the fuel tank?
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Old 08-18-2016, 09:31 PM
Val Val is offline
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Boat: Mastercraft 205 1996 LT1
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What is this "safe mode" mentioned below?


1996 ProStar 205 LT1
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