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Old 06-13-2015, 11:28 AM
gz960 gz960 is offline
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Join Date: Jun 2015
Boat: Mastercraft, Maristar 230, 1999, 330HP MX Max Indmar
Location: Midwest
Posts: 1
99 Maristar 230 Low RPMs

I have a 99 Maristar 230 with the 330 MX Max LTR Marine Fuel Injected Indmar engine. Full throttle boat only gets to about 40 mph (would normally get to 50). If I pull up and down quickly on the throttle it gains rpms each time and I'm able to get to max speed doing this. Boat runs a little rough at idle. Changed TPS, checked spark, checked fuel pressure: at idle -35 and under load - 35. In neutral boat revs fine. Any help is appreciated. Thanks.
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Old 06-13-2015, 12:13 PM
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mtajpa mtajpa is offline
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Join Date: Feb 2009
Boat: MC 1999 Maristar 230 sport
Location: Southwest
Posts: 839
Check that the knock sensor is connected. Its on the port side above the starter. This is sometimes disconnected when winterizing.
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99 MariStar 230 Sport LTR 330
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