Idle Air/Vacuum Signal Housing

Idle Air/Vacuum Signal Housing:

This procedure may be performed without removing the throttle body from the intake manifold plenum.

REMOVAL:

1. Remove the idle air control valve, see IDLE AIR CONTROL VALVE.
2. Remove the idle air/vacuum signal housing screws.
3. Remove the idle air/vacuum signal housing assembly.
4. Remove the idle air/vacuum signal assembly gasket, and discard.
5. Clean the mounting surfaces to ensure a good seal.

INSTALLATION:

1. Locate the idle air/vacuum signal housing assembly, with new gasket in position on the throttle body.
2. Install idle air/vacuum signal housing screws, and tighten screws (starting in the center and moving outward) to 3.4 Nm (30 lb.in).

Idle Air Control (IAC) Valve:

3. If installing a new IAC valve:
^ Measure the distance between the tip of the IAC valve pintle and the mounting flange.
^ 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.
4. Lubricate the IAC valve O-ring with clean engine oil, and install the O-ring on the IAC valve.
5. Install the IAC valve assembly.
6. Install the IAC valve attaching screws, and tighten to 3.0 Nm (27 lb.in).