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2007 indmar MCX
Boat starts and idles fine. Takes off great. Smooth powerful. Then loses power. You have to pull throttle down to idle speed then give it gas and it takes off again. It used to do it intermittently, and not at high speeds or with boat loaded down. But now does it everytime. We've taken air filter off and watched the throttlebody flap close when it does it. So something is telling it to close. We tried holding flap open and it bogs and misfires. Then turn Boat off and it runs fine and goes through same process.
Things I've done or tested.
New fuel pump and filter
Fuel pressure fine all the way through problem.
Changed MAP sensor
Changed TPS sensor
Changed throttle cable
New throttlebody (did samething so returned it)
New ignition switch (key)
Checked for bad grounds and corroded wires
Changed oil & filter 😂
I've taken battery cables off each time to clear ECU
Local shop with MEFI computer is booked til Aug 17. So I can't tell what codes are popping up.
One note. My medallion 1600 dash gauge brain is toast so I can't see readings. But I've used it many times this summer. And nothing has overheated or seized up.
Thoughts?
Thanks for The help I just resubscribed here
I was on here back in the day when it was just a forum been reading a lot of on here
thanks again
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