90-823225--1 10965E-176 - ELECTRONIC FUEL INJECTION (MULTI-PORT AND THROTTLE BODY)
Idle Air Control (IAC) Valve
NOTICE
Refer to “Service Precautions,” in “Repair
Procedures,” BEFORE proceeding.
REMOVAL
1. Remove flame arrestor, throttle cable and throttle
body as outlined in “Throttle Body.”
2. Disconnect electrical connector at idle air control
(IAC) valve.
72800
b
c
d
a
All Multi-Port Engines (Except Black Scorpion)
a - Throttle Body
b - Idle Air Control (IAC) Valve
c - O-Ring
d - Screws
75326
b
a
Black Scorpion
a - Idle Air Control (IAC) Valve
b - Screws (One Hidden In This View)
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 re-
move 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 an identical part. IAC valve
pintle shape and diameter are designed for the
specific application.
1. Install new O-ring on IAC valve.
2. Install IAC valve in throttle body using screws.
Torque to 20 lb. in. (2 N·m).
3. Install throttle body, throttle linkage and flame ar-
restor as outlined in “Throttle Body.”
4. Reset IAC valve pintle position.
a. Turn ignition key ON for ten seconds.
b. Turn ignition key OFF for ten seconds.
c. Restart engine and check for proper idle op-
eration.
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