Intake Air Control Valve
- Install a 3-way vacuum "T" fitting in vacuum hose between Intake Air Control Valve (IACV) actuator and ACIS Vacuum Switch Valve (VSV). See Fig 1. Connect a vacuum gauge to vacuum "T" fitting. Start engine. With engine idling, ensure vacuum is not present.
- Snap accelerator to Wide Open Throttle (WOT). Ensure vacuum reading momentarily reads about 9.8 in. Hg and IACV actuator rod pulls down. If vacuum is not as specified or actuator valve rod fails to pull down, go to next step.
- Remove IACV. Apply about 15.8 in. Hg to IACV actuator. If IACV actuator rod does not move, turn adjusting screw on IACV assembly. If IACV actuator rod still does not move, replace IACV actuator. If IACV actuator rod moves, check to see if diaphragm holds vacuum for at least one minute. If diaphragm does not hold vacuum, replace IACV actuator. If diaphragm holds vacuum, check vacuum tank. See ACIS VACUUM TANK .
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