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, 6.2 J, STANDARDREPAIR AND DIAGNOSIS (SINGLE PAGE)ENGINE PERFORMANCESYSTEMAIR CLEANER - THERMOSTATICCOMPONENT TESTINGVACUUM CONTROL TEMPERATURE SENSOR TEST
1987 Chevrolet Step Van P20, 6.2 J, Standard
Vacuum Control Temperature Sensor Test
1987 Chevrolet Step Van P20, 6.2 J, StandardSECTION Vacuum Control Temperature Sensor Test
- With engine cold, check damper door. It should be in open snorkel position. Place thermometer inside air cleaner, near sensor.
- With engine temperature below 80°F (27°C), start engine and run at idle. Damper door should be in closed snorkel position. When door starts to open, read thermometer in air cleaner. Temperature should be 100-140°F (38-59°C). If door does not begin to open at this temperature, replace sensor.
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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.