Early Models

Idle Speed Regulator:

The idle speed regulator controls the amount of air that is allowed to bypass the throttle plates. This is done at closed throttle conditions to maintain an engine idle speed range. The idle speed regulator is located in-line between the intake air duct (after the air filter) and the throttle body adapter.

The idle speed regulator contains a permanent magnet motor that operates a vane type air valve. The Engine Control Unit (ECU) controls the amount of bypass air by operating the motor, thereby enlarging or restricting the air passage. The regulator receives voltage from the B+ latch relay and is grounded by the ECU. By controlling the ground path, the ECU can either extend or retract the valve.