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Home >> Chevrolet >> 1985 >> Impala 5.0 H >> Repair and Diagnosis >> Engine Performance >> System >> Fuel Injection System - Dual Unit TBI >> Adjustments >> Idle Air Control

Idle Air Control

  1. Pry out idle stop screw plug in throttle body. With IAC motor connected, ground diagnostic lead "A" on diagnostic connector. Diagnostic connector is behind left side of instrument panel near steering column.
  2. Connect tachometer to engine. Turn on ignition, but do not start engine. Wait at least 30 seconds. With ignition on, disconnect IAC connector. Remove ground from diagnostic lead and start engine.
  3. Adjust idle set screws to 475-625 RPM in Drive. Turn ignition off and reconnect connector at IAC motor. Adjust TPS to .525 volts. Start engine and check for proper idle operation.
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