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 MANUALSCHEVROLET2002EXPRESS 1 TON VAN V8-8.1L VIN GREPAIR AND DIAGNOSISPOWERTRAIN MANAGEMENTCOMPUTERS AND CONTROL SYSTEMSMANIFOLD PRESSURE/VACUUM SENSORSERVICE AND REPAIR
2002 Chevrolet Express 1 Ton Van V8-8.1L VIN G
Manifold Pressure/Vacuum Sensor: Service and Repair
2002 Chevrolet Express 1 Ton Van V8-8.1L VIN GSECTION Service and Repair
REMOVAL PROCEDURE
1. Remove the engine cover.
2. Disconnect the manifold absolute pressure (MAP) sensor electrical connector.
3. Remove the MAP sensor retaining bolt and washer(1).
4. Remove the MAP sensor (3) from the intake manifold (2).
5. Inspect the MAP sensor seal for wear or damage and replace as necessary.
INSTALLATION PROCEDURE
IMPORTANT: Lightly coat the MAP sensor seal with rubber lubricant part number 9985770 before installing the sensor. The lubricant should be applied with a sponge or a brush. To prevent blockage, avoid dipping the sensor port directly into the lubricant.
1. Install the MAP sensor (3).
NOTE: Refer to Fastener Notice in Service Precautions.
2. Install the MAP sensor retaining bolt and washer(1).
Tighten
Tighten the fastener to 12 N.m (106 lb in).
3. Connect the MAP sensor electrical connector.
4. Install the engine cover.
1. Remove the engine cover.
2. Disconnect the manifold absolute pressure (MAP) sensor electrical connector.
3. Remove the MAP sensor retaining bolt and washer(1).
4. Remove the MAP sensor (3) from the intake manifold (2).
5. Inspect the MAP sensor seal for wear or damage and replace as necessary.
INSTALLATION PROCEDURE
IMPORTANT: Lightly coat the MAP sensor seal with rubber lubricant part number 9985770 before installing the sensor. The lubricant should be applied with a sponge or a brush. To prevent blockage, avoid dipping the sensor port directly into the lubricant.
1. Install the MAP sensor (3).
NOTE: Refer to Fastener Notice in Service Precautions.
2. Install the MAP sensor retaining bolt and washer(1).
Tighten
Tighten the fastener to 12 N.m (106 lb in).
3. Connect the MAP sensor electrical connector.
4. Install the engine cover.
RENDER: 1.0x
NO RELATED
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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.