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Old 05-29-2019, 09:56 PM   #1
Join Date: May 2019
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Default 1999 Maxum 2300 SC - Stalls when moving into idle

New owner (but not new to boating), 1999 Maxum 2300 SC. Engine 350 MAG MPI. Engine is fairly new - less than 100 hours (guessing), was replaced last year by the previous owner.

I just purchased this two weeks ago, second time out, had our first issue: After cruising the lake for 3 hours, pulled into the city slip to use the facilities and pick folks up, upon returning about 20 minutes later I find that the engine will not start in the neutral position. Engine cranks fine and sounds like it might start but doesn't. Pushed throttle lever button to disengage shifter and open up the throttle a bit, it will crank, and start...sounds fine at about 1000 RPM's.

All gauges look normal. Putting the boat into neutral kills the engine. Will not restart unless the throttle is advanced...after a couple of tries I figured out if I was fast enough, I could get it into gear.

All indicators seem to point to the Idle Air Controller - but, I can't seem to locate this part in the engine compartment. Mercruiser website lists the part number, but it is not on any of their diagrams.

Can anyone point me in the right direction - a photo perhaps? I know what the part looks like, but I'm just not seeing it.

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Old 05-29-2019, 10:28 PM   #2
mmwjr's Avatar
Join Date: Feb 2012
Location: Essex, Maryland
Posts: 7,768

Welcome aboard

See like to throttle body assembly, IAC is #16
1997 2400 SCR
5.7 Vortec / Bravo 2
mmwjr is offline   Reply With Quote

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