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.
1986 Chevrolet Sprint Base, 2D Hatchback, AutomaticFACTORY OEM SERVICE PROCEDURE
Feedback System Check
- Turn cancel switch on, located near fuse block, under left side of dash. See Fig 1 ignition on, but do not start engine. Oxygen sensor light in dash should light, but not flash.
- If oxygen sensor light does not operate, check light circuitry. After oxygen sensor light operates, start engine and warm to normal operating temperature.
- Run engine at 1500-2000 RPM and check that oxygen sensor light flashes. If it does not flash, check and adjust or replace the following: oxygen sensor, mixture control solenoid, carburetor idle mixture, thermal switch, electrical connections, ECM or microswitches.
- After making sure oxygen sensor light flashes, turn cancel switch "OFF". Oxygen sensor light should go out.
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.