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 Chevrolet Hi-Cube 6.2 J, 400/M40FACTORY OEM SERVICE PROCEDURE
Sending Units/Sensors
SENDING UNITS/SENSORS LOCATION
| Component | Location |
|---|---|
| Coolant Temp. Sending Unit/Switch | On left of engine. |
| Coolant Temperature Sensor | In right front corner of intake manifold. |
| Detonation (Knock) Sensor (ESC) | On lower left side of engine block. |
| Engine Speed Sensor (6.2L) | On top of vacuum pump. |
| MAP Sensor (Diesel) | On right firewall in engine compartment. |
| MAP Sensor (Gas) | On top right side of engine. See Figure. |
| Oil Pressure Sending Unit/Switch | On top rear of block. |
| Oxygen Sensor | In exhaust manifold. |
| Throttle Position Sensor (Gas) | On throttle linkage. See Figure. |
| Throttle Position Sensor (Diesel) | On pump throttle valve. See Figure. |
| Vehicle Speed Sensor | In instrument panel behind speedometer. |
Factory Service Tools
Use the Manual With the Right Hardware
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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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