Firebird V8-305 5.0L (1982)
Idle Speed/Throttle Actuator - Electronic: Service and Repair
Fig. 166 Idle Air Control Assembly
REMOVAL
1. Remove air cleaner, then disconnect electrical connection from Idle Air Control (IAC).
2. Using a suitable wrench, remove IAC assembly from throttle body and discard valve gaskets. Before installing new IAC assembly, measure
extension of conical valve, Fig. 166. Make measurement from motor housing to end of pintle. The extension should be 11/8 inch. If cone is
extended too far, the motor may be damaged during installation.
INSTALLATION
NOTE: Identify replacement IAC assembly as being either Type 1 or Type 2, Fig. 166. If dimension "A" is greater than 11/8 inch, reduce distance as
follows:
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On Type 1, exert a firm pressure on conical valve to retract it.
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On Type 2, while turning valve in clockwise rotation, compress retaining spring from conical valve. Return spring to original position with
straight part of spring end aligned with flat surface of valve.
1. Install new IAC assembly to throttle body. Torque motor to 13 ft. lbs.
2. Reconnect IAC electrical connection and install air cleaner.
3. Start engine and run until normal operating temperature is reached. On 1984-88 vehicles, the ECM will reset idle speed when vehicle is driven
over 35 mph.
