1986 Mitsubishi Mirage BaseFACTORY OEM SERVICE PROCEDURE

Air Switching Valve System

  1. Run engine at idle. Disconnect solenoid valve connector to disable solenoid valve. Manifold vacuum will act on air switching valve, causing it to open. If idle drops excessively or engine stalls, air switching valve and solenoid valve are okay.
  2. If idle speed does not change, check condition of air switching and solenoid valves. Also check vacuum passage for clogging.
  3. With engine idling, battery voltage should be measured at solenoid connector. If no voltage is present, electrical wiring or engine speed sensor is defective.
  4. Increase engine speed to 1500 RPM. Verify voltage is present at solenoid valve connector. If not, engine speed sensor is defective.
  5. Increase engine speed to 2500 RPM. Verify no voltage is present at solenoid valve connector. If it is, engine speed sensor is defective.
Factory Service Tools

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When to See a Mechanic

Stop DIY work and contact a certified mechanic immediately if any of the following apply:

  • • You smell fuel, burning insulation, or see smoke.
  • • Brakes feel soft, pull hard to one side, or make grinding noises.
  • • The engine overheats, stalls repeatedly, or misfires under load.
  • • You are missing required tools, torque specs, or safe lifting equipment.
  • • You are not confident in the next step or safety outcome.

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