1987 Mitsubishi Starion ESI-RFACTORY OEM SERVICE PROCEDURE

Power Steering & Electrical Load System

  1. Engine coolant temperature should be 185-205°F (85-95°C). Disconnect Yellow-striped vacuum hose from throttle opener and connect vacuum pump to nipple. Apply vacuum and check that throttle opener rod pulls up.
  2. Apply 19.8 in. Hg of vacuum to throttle opener and check that it holds. Start engine and close Yellow-striped vacuum hose with finger to check for vacuum build-up when lighting switch is turned on and off.
  3. With lighting switch in "OFF" position and engine at idle, there should be no vacuum. With lighting switch in "ON" position and engine at idle, there should be vacuum. With lighting switch in "ON" position and engine at 1200 RPM or more, there should be no vacuum.
  4. Vacuum should be felt at hose end when one turn is given to steering wheel.
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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