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Old 06-18-2015, 06:50 AM
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bret bret is offline
MC Devotee
Join Date: Aug 2004
Boat: Prostar 190, 1993, Anniversary Limited.
Location: Heber Springs, AR
Posts: 1,291
If cleaning the IAC, make sure you have a new gasket for it to avoid a vacuum leak.
1993 25th Anniversary Limited ProStar 190, #17
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Old 06-18-2015, 09:04 AM
Jorski Jorski is offline
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Join Date: Jul 2004
Boat: 1993 190 with LT1
Location: Toronto, Canada
Posts: 1,540
Also....check screen on the inlet side of the fuel pump...you have to remove the fittings to get at it....they just unscrew.
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Old 06-18-2015, 10:15 AM
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east tx skier east tx skier is offline
MC Hero
Join Date: Jul 2004
Boat: 1998 Ski Nautique
Location: End of my rope.
Posts: 26,186
Does it lope at idle? I had that issue on my boat (different engine). New IAC did the trick.
Previous: 1993 Prostar 205

Red 1998 Ski Nautique, PCM GT40, 310 hp, , Acme 4 blade, Perfect Pass SG/Zbox.


Be kind. Have fun.
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Old 06-20-2015, 06:45 PM
Dkattman Dkattman is offline
TT Newbie
Join Date: Jun 2015
Boat: Mastercraft, Prostar 190, 1995, lt1
Location: Midwest
Posts: 6
OK. I replaced the two fuel filters, removed the fuel pump on the back of the motor and found a clear screen, replaced the throttle position sensor and the IAC, and cleaned the intake and butterfly with choke cleaner without dismantling it. Started just fine. Idled well for 5-8 minutes. Then the motor started dying. Seamed to have a slight lag when juicing the throttle. The fuel pump whines off and on. Didn't feel comfortable taking it for a test drive.

In summary it started right away, idled fine for a while, then stumbled. My instinct is it isn't fixed and will continue to die.

Any help is appreciated.
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fuel, gas, idle, ignition, lt1

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