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 MANUALSCHEVROLET1998EXPRESS 1 TON VAN V8-5.7L VIN RREPAIR AND DIAGNOSISPOWERTRAIN MANAGEMENTCOMPUTERS AND CONTROL SYSTEMSMANIFOLD PRESSURE/VACUUM SENSORSERVICE AND REPAIR
1998 Chevrolet Express 1 Ton Van V8-5.7L VIN R
Manifold Pressure/Vacuum Sensor: Service and Repair
1998 Chevrolet Express 1 Ton Van V8-5.7L VIN RSECTION Service and Repair
MAP Sensor:
NOTE: Other than checking for a worn grommet and loose electrical connections, the only service possible is unit replacement, if the diagnosis shows the sensor to be faulty.
IMPORTANT: After removing the MAP sensor from the intake manifold, replace the MAP sensor to intake manifold seal.
REMOVAL PROCEDURE
1. Disconnect the negative battery cable.
2. Remove the electrical connector releasing the locking tab.
3. Remove the MAP sensor by gently prying the MAP sensor out of the intake plenum.
4. Remove the MAP sensor grommet.
5. Discard the MAP sensor grommet.
INSTALLATION PROCEDURE
1. Install the new MAP sensor grommet on the MAP sensor.
2. Install the MAP sensor into the intake plenum.
3. Install the electrical connector.
4. 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.