S10/T10 Blazer 2WD V6-262 4.3L VIN Z (1994)
Idle Speed/Throttle Actuator - Electronic: Service and Repair
NOTES
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The Idle Air Control (IAC) valve is an electrical component and must not be soaked in any liquid cleaner or solvent. Otherwise damage could
result.
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The IAC valve for this application is thread-mounted and has a dual taper, 10 mm diameter, pintle. Any replacement of the IAC valve must have
the correct part number, with the appropriate pintle taper and diameter for proper seating of the valve in the throttle body.
IAC Thread Mounted 10mm Pintle
REMOVE/DISCONNECT
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Electrical connector.
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IAC valve, use a 32 mm (1 1/4") wrench.
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IAC gasket and discard.
CLEAN
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Both original and replacement IAC valves have a special factory applied thread-locking compound applied to the screw threads. If the valve
removed from throttle body is being reinstalled, DO NOT remove thread-locking that may remain on the threads.
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Clean IAC valve seating surfaces on throttle body to assure proper seal of new gasket and IAC valve.
Idle Air Control Valve Pintle Retraction (Manually)
NOTES
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If the IAC valve was removed during service, its operation may be tested electrically with the IAC/ISC Motor Tester (J-37027 or BT-8256K) or
equivalent. Before installing IAC valve, measure the distance between the tip of the valve pintle and mounting surface. If the dimension is greater
than 28.0 mm (1.10 inches), valve pintle must be retracted to prevent damage to valve. This may be done electrically using an IAC/ISC Motor
Tester or manually by exerting firm pressure, as shown in the illustration, with a slight side to side movement on valve pintle to retract it.
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No physical adjustment of the IAC valve assembly is required after installation. The IAC valve pintle is reset by turning the ignition "ON" for ten
seconds and then OFF. The ECM then resets the pintle to the correct position. Proper idle regulation should result.
INSTALL/CONNECT
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IAC valve into throttle body with new gasket.
NOTE New IAC valves have been reset at the factory and should be installed in throttle body in an "as is" condition, without any adjustment.
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Tighten IAC valve assembly to 18.0 Nm (13.0 lb-ft).
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Electrical connector to IAC valve.
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Reset IAC valve pintle position as follows:
- Depress accelerator pedal slightly.
- "START" and run engine for five seconds.
- Turn ignition "OFF" for ten seconds.
