Safety Warning
DIY auto repair can cause serious injury, fire, or vehicle damage. These guides are for informational purposes only. Always follow OEM torque specs, wear PPE, and consult a certified mechanic if you are unsure. You are solely responsible for your safety.
1987 Mitsubishi Starion ESI-RFACTORY OEM SERVICE PROCEDURE
Component Testing: CARBURETED
- Disconnect air supply hose(s) from air cleaner. Start engine and warm to 68-104°F (20-40°C). There should be suction at air hose(s) at idle. When engine temperature is 158°F (70°C) or more, there should be suction (at idle) within 70 seconds after starting engine. After 70 seconds, there should be no suction. Accelerate engine to 4000 RPM and as engine is decelerating, there should be suction at air hose(s).
- If these conditions are met, secondary air supply system is good. Replace secondary air control valve assembly and reed valve if exhaust gases blow out of air hose.
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.