MULTI-PORT FUEL INJECTION DISASSEMBLY AND REASSEMBLY
SERVICE MANUAL NUMBER 23
90-861326--1 MARCH 1999 Page 5C-51
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 care-
ful 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 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.
75657
c
a
b
a-Screw (2)
b-Idle Air Control (IAC) Valve
c-Throttle Body
2. Install IAC valve in throttle body using screws. Torque to 20 lb-in. (2 Nm).
3. Place a new gasket between throttle body and adapter.
4. Install the throttle body on the adapter and torque the screws to 89 lb-in. (10 Nm).
5. Reset IAC valve pintle position as follows:
a. Turn ignition key ON for ten seconds.
b. Turn ignition key OFF for ten seconds.
c. Restart engine and check for proper idle operation.
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