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Pickup & 4Runner - Carbureted

When testing outer vent control valve, note that valve is moved by manifold vacuum and held by the solenoid. The solenoid cannot move the valve.

  1. Disconnect outer vent hose from carburetor. Blow air into outer vent pipe and check that valve is open. Start the engine. With the engine idling, blow air into outer vent pipe and check that valve is closed.
  2. Unplug the wiring connector from the solenoid. Using an ohmmeter, check the valve's resistance between the positive terminal and the solenoid body. Resistance should be 63-73 ohms at 68°F (20°C).
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