idle to wide open throttle boat stalls at about 3000 rpm's

[moombachad]

need help
from idle to WOT my boat stalls at about 3000 rpm's for 1 to 2 seconds but recovers and runs fine, also runs fine
the rest of the time.

drained tank refueled with high octane non ethanol
replaced fuel filter
replaced water fuel filter
replaced TPS sensor

1998 MOOMBA OUTBACK
515 HOURS
INDMAR 350 GEN 1 PLUS EDL MPI ENGINE

[mmandley]

When your below 3k is it smooth and responsive?

When is the last time you changed plugs, wire, cap and rotor?


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[moombachad]

runs smooth and responsive other then when idling for long periods it
will surge sometimes.
haven't changed plugs, wires or cap and rotor

[mmandley]

I would start with those items

After that your prolly having issues on your carb secondary jets or plates

If you can have someone drive so you can see if the secondary butterflies are opening on your carb

You might be running super rich over 3k

Black or wet spark plugs will show that as well.

If butterflies are opening you might be having jet issues. At WOT you should see fuel spraying.


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[moombachad]

the 350 MPI is efi, but my next step was to change those items thanks

[zabooda]

First I learned Moomba used EFI in the 98s. I knew they offered both PCM which I have and the Indmar engines and that may be the reason. Besides what Mike mentioned, I would recommend running Seafoam through the fuel system.

[mmandley]

Sorry missed you had EFI lol


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[moombachad]

any body??????

need help
from idle to WOT my boat stalls at about 3000 rpm's for 1 to 2 seconds but recovers and runs fine, also runs fine
the rest of the time.

drained tank refueled with high octane non ethanol
replaced fuel filter
replaced water fuel filter
replaced TPS sensor
replaced spark plugs, cap and rotor

1998 MOOMBA OUTBACK
515 HOURS
INDMAR 350 GEN 1 PLUS EDL MPI ENGINE

[sivs1]

WOT on the three boats i have owned is higher than 3,000 rpm. What does it do at 4,000?

Other thought was fuel, but you're already using what I would recommend, have you burnt through a full tank of the good stuff yet? Maybe second full tank will be better?

[mikepo26]

I m thinking if the system uses a mass air flow sensor then as you accelerate it will not know the correct air flow and not provide spark and fuel properly