350 MPI Horizon Idle

cfd95

Active Member
Nov 5, 2013
410
Northport Long Island
Boat Info
2002 310 Sundancer
Engines
350 Horizons
V Drives
I have 2002 350 MPI Horizon motors.
What controls the idle on these motors?
There is no IAC valve on these motors I only see MAP sensors.
Reason why i ask is that the starboard motor is making a loud hissing sound out of the throttle body at an idle.
Port motor does not.
I'm thinking possibly a bad PCV valve.
It's the only vacuum source connected to the throttle body.
 
you have an iac valve for sure and the hissing sound at idle occours when the small iac muffler in the throttle body is missing . no big deal and it a few pennies item and two minutes to install
 
you have an iac valve for sure and the hissing sound at idle occours when the small iac muffler in the throttle body is missing . no big deal and it a few pennies item and two minutes to install
There is no muffler the IAC is mounted on side of throttle body not to manifold like the ones with the muffler.
 

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