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.
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HOMESERVICE MANUALSCHEVROLET1987STEP VAN P20, 7.4 W, AUTOMATIC, 475/M40REPAIR AND DIAGNOSISENGINE PERFORMANCETESTING & DIAGNOSISFUEL INJECTION SYSTEM - TBIREMOVAL & INSTALLATIONOXYGEN SENSOR
1987 Chevrolet Step Van P20, 7.4 W, Automatic, 475/M40
Oxygen Sensor
1987 Chevrolet Step Van P20, 7.4 W, Automatic, 475/M40SECTION Oxygen Sensor
- Locate oxygen sensor. Disconnect battery negative cable. Disconnect sensor at electrical connector. DO NOT remove wire (pigtail) from oxygen sensor.
- Carefully back sensor out of exhaust manifold. Handle sensor with care and do not allow dirt or other foreign matter to contact louvered end of sensor.
- To install, reverse removal procedure. Coat threads of replacement sensor with Anti-Seize Compound (Part No. 3613695). Tighten sensor to 30 ft. lbs. (41 N.m).
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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.