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 MANUALSCHEVROLET1999EXPRESS 1/2 TON VAN V6-4.3L VIN WREPAIR AND DIAGNOSISPOWERTRAIN MANAGEMENTCOMPUTERS AND CONTROL SYSTEMSMANIFOLD PRESSURE/VACUUM SENSORSERVICE AND REPAIR
1999 Chevrolet Express 1/2 Ton Van V6-4.3L VIN W
Manifold Pressure/Vacuum Sensor: Service and Repair
1999 Chevrolet Express 1/2 Ton Van V6-4.3L VIN WSECTION Service and Repair
REMOVAL PROCEDURE
Other than checking for a worn grommet and loose electrical connectors, the only service possible is a unit replacement if the diagnosis shows a malfunctioning MAP sensor.
CAUTION: Refer to Battery Disconnect Caution in Service Precautions.
1. Disconnect the negative battery cable.
2. Remove the engine cover.
3. Disconnect the MAP sensor harness connector.
NOTE: Do not rotate or pry on the MAP sensor when removing. Damage to the MAP sensor or the intake manifold may result.
IMPORTANT: After removing the MAP sensor from the intake manifold, replace the MAP sensor to intake manifold grommet.
4. Remove the MAP sensor.
5. Remove the MAP sensor grommet.
6. Discard the MAP sensor grommet.
INSTALLATION PROCEDURE
1. Install the new MAP sensor grommet on the MAP sensor.
2. Install the MAP sensor.
3. Connect the MAP sensor harness connector.
4. Install the engine cover.
5. Connect the negative battery cable.
Other than checking for a worn grommet and loose electrical connectors, the only service possible is a unit replacement if the diagnosis shows a malfunctioning MAP sensor.
CAUTION: Refer to Battery Disconnect Caution in Service Precautions.
1. Disconnect the negative battery cable.
2. Remove the engine cover.
3. Disconnect the MAP sensor harness connector.
NOTE: Do not rotate or pry on the MAP sensor when removing. Damage to the MAP sensor or the intake manifold may result.
IMPORTANT: After removing the MAP sensor from the intake manifold, replace the MAP sensor to intake manifold grommet.
4. Remove the MAP sensor.
5. Remove the MAP sensor grommet.
6. Discard the MAP sensor grommet.
INSTALLATION PROCEDURE
1. Install the new MAP sensor grommet on the MAP sensor.
2. Install the MAP sensor.
3. Connect the MAP sensor harness connector.
4. Install the engine cover.
5. Connect the negative battery cable.
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.