5.0/5.7/6.0L/8.1L ECM and Sensors 2 - 17
MEFI 4 - PCM
1 O-RING - IAC VALVE
2 IAC VALVE ATTACHING SCREW
A DISTANCE OF PINTLE EXTENSION
B DIAMETER OF PINTLE
B
A
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RS 22181
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8-24-94
Idle Air Control (IAC) Valve
Remove or Disconnect
1. Flame arrestor.
2. IAC electrical connector.
3. IAC valve attaching screws (1).
4. IAC valve (2).
Notice: On IAC valves that have been in service, Do Not
push or pull on the IAC valve pintle. The force required
to move the pintle may damage the threads on the worm
drive. Also, Do Not soak IAC valve in any liquid cleaner or
solvent, as damage may result.
Clean and Inspect
• Clean IAC valve O-ring sealing surface, pintle valve
seat and air passage.
– Use carburetor cleaner to remove carbon deposits.
Do Not use a cleaner that contains methyl ethyl
ketone, an extremely strong solvent, and not
necessary for this type of deposit.
– Shiny spots on the pintle or seat are normal,
and do not indicate misalignment or a bent pintle
shaft.
Important
• If installing a new IAC valve, be sure to replace with
an identical part number. IAC valve pintle shape and
diameter are designed for the specifi c application.
Measure (If installing a new IAC valve)
• Distance between tip of IAC valve pintle and mounting
surface.
– If greater than 28 mm, use finger pressure to
slowly retract the pintle. The force required to
retract the pintle of a new valve will not cause
damage to the valve.
Install or Connect
1. New O-ring on IAC valve and lubricate.
Notice: New IAC valves have been preset at the factory
and should not require any adjustment.
2. IAC valve to throttle body using attaching screws.
Torque to 3.2 N•m (28 lb in).
3. IAC valve electrical connector.
4. Reset IAC valve pintle position:
• Turn ignition “OFF” for 10 seconds.
• Start and run engine for 5 seconds.
• Ignition “OFF” for 10 seconds.
• Restart engine and check for proper idle.
M4085
M4085
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