Caprice V8-265 4.3L VIN W MFI (1995)
IAC Valve
REMOVE OR DISCONNECT
1. Resonator.
2. Distributor ventilation vacuum line at air intake duct.
3. Electrical connector from Intake Air Temperature (IAT) sensor.
4. Air intake duct.
5. Electrical connector from Idle Air Control (IAC) valve.
6. IAC valve assembly attaching screws.
7. IAC valve assembly.
CLEAN AND INSPECT
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Clean IAC valve O-ring sealing surface, pintle valve seat and air passage.
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The IAC valve may be cleaned using GM cleaner 1052626 or GM X-66A. Use a shop towel or parts brush to remove heavy deposits.
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Shiny spots on the pintle or seat are normal, and do not indicate misalignment or a bent pintle shaft. If air passage has heavy deposits, remove
throttle body for complete cleaning.
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Inspect IAC valve O-ring for cuts, cracks, or distortion. Replace if damaged.
NOTICE: If installing a new IAC valve, be sure to replace with an identical part. IAC valve pintle shape and diameter are designed for specific
application.
MEASURE (IF INSTALLING A NEW IAC)
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Distance between tip of IAC valve pintle and mounting surface.
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If greater than 28 mm (1.100 in), 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. Lubricate IAC valve O-ring with clean engine oil.
2. IAC Valve assembly.
3. IAC valve attaching screws.
Tighten
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IAC attaching screws to 3 Nm (27 lb in.).
4. Electrical connector to IAC valve.
5. Air intake duct.
6. Electrical connector to IAT valve.
7. Distributor ventilation vacuum line at air intake duct.
8. Resonator.
9. Reset IAC valve pintle position.
A. Depress accelerator slightly.
B. Start engine and release accelerator pedal, run engine for 5 seconds.
C. Turn engine "OFF" for 10 seconds.
D. Restart engine and check for proper idle operation.
