See Figure 1
The idle speed regulator is found only on the early Premier and Monaco vehicles. The idle speed regulator allows a controlled amount of air from the air cleaner to reach the intake manifold during closed throttle conditions to maintain engine idle. The inlet side of the regulator is connected to the air cleaner bonnet, while the outlet side is connected to the throttle body adapter below the throttle plate by a hose.
The idle speed regulator consists of a permanent magnet motor that operates a vane type valve. The ECU controls the amount of air routed through the regulator by opening and closing the valve. Voltage is supplied to the idle speed regulator through the battery positive (B+) Latch relay, while the ECU controls the ground path to extend or retract (open or close) the valve.
Both Special tool 7195 (adapter harness) and Special tool 7088 (idle speed exerciser), or their equivalents, will be needed for this procedure.
- Attach adapter harness tool 7195 or equivalent to the idle speed exerciser tool 7088 or equivalent and to the idle speed regulator.
- Attach the exerciser power leads to the battery.
- Start the engine.
- Push the exerciser in the extend direction, then in the retract direction. The engine idle speed will change if the regulator is operating normally.
- If the engine idle speed does not change, remove the regulator. Leave the exerciser and the adapter attached.
- Look inside the regulator ports and cycle the exerciser from extend to retract. The valve inside should open and close while cycling the exerciser. If it does not, replace the idle speed regulator with a new one.
REMOVAL & INSTALLATION
- Disconnect the battery negative cable.
- Remove the regulator electrical connector.
- Remove the air inlet hose.
- Disconnect the regulator outlet hose at the regulator.
- Remove the regulator clamp bolt.
- Remove the regulator.
- Install the regulator with the arrow (cast into the ports) pointing toward the throttle body adapter.
- Secure the clamp with the bolt.
- Attach the air inlet hose and outlet hoses to the regulator.
- Plug the electrical connector back into the regulator.
- Connect the negative battery cable.