Idle Air Control (Iac) Valve - MerCruiser 305 CID (5.0L) Service Manual

SUPPLEMENT TO SERVICE MANUAL NUMBER 24

Idle Air Control (IAC) Valve

REMOVAL
1. Remove flame arrestor, throttle cable and throttle body.
2. Disconnect electrical connector at idle air control (IAC) valve.
3. Remove IAC from throttle body.
CLEANING AND INSPECTION
1. Remove and discard sealing O-ring from IAC valve. Clean sealing surfaces, pintle valve
seat, and air passage with a carburetor cleaner to remove carbon deposits, being
careful not to push or pull on the IAC valve pintle. Force exerted on the pintle might
damage the worm drive. DO NOT use a cleaner that contains the extremely strong
solvent methyl ethyl ketone.
NOTE: Shiny spots on the pintle, or seat, are normal and do not indicate misalignment or
a bent pintle shaft.
2. Inspect the entire assembly for any obvious physical damage.
INSTALLATION
IMPORTANT: If installing a new IAC valve, be sure to replace it with the correct IAC
valve pintle shape and diameter are designed for the specific application.
1. Install new O-ring on IAC valve.
90-861327000 JULY 2000
b
a - Idle Air Control (IAC) Valve Connector
b - Screws
a -

Idle Air Control (IAC) Valve

b - O-Ring
FUEL INJECTION DISASSEMBLY AND REASSEMBLY
a
75788
a
b
75784
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