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.
2003 Chevrolet Express 1/2 Ton Van V6-4.3L VIN XFACTORY OEM SERVICE PROCEDURE
Air Temperature Sensor ( Ambient / Intake ): Service and Repair
MASS AIR FLOW (MAF)/INTAKE AIR TEMPERATURE (IAT) SENSOR REPLACEMENT
REMOVAL PROCEDURE
1. Turn OFF the ignition.
2. Disconnect the mass air flow (MAF) sensor harness connector.
3. Loosen the clamps (1) on the MAF sensor.
4. Carefully remove the MAF sensor from the air intake ducts (5).
INSTALLATION PROCEDURE
1. Install the MAF sensor (5) into the air intake ducts.
IMPORTANT: Ensure that the MAF sensor flow arrows point away from the air cleaner assembly.
2. Tighten the clamps (1) on the MAF sensor.
NOTE: Refer to Fastener Notice in Service Precautions.
Tighten
Tighten the clamps to 4 N.m (35 lb in).
3. Connect the MAF sensor harness connector.
REMOVAL PROCEDURE
1. Turn OFF the ignition.
2. Disconnect the mass air flow (MAF) sensor harness connector.
3. Loosen the clamps (1) on the MAF sensor.
4. Carefully remove the MAF sensor from the air intake ducts (5).
INSTALLATION PROCEDURE
1. Install the MAF sensor (5) into the air intake ducts.
IMPORTANT: Ensure that the MAF sensor flow arrows point away from the air cleaner assembly.
2. Tighten the clamps (1) on the MAF sensor.
NOTE: Refer to Fastener Notice in Service Precautions.
Tighten
Tighten the clamps to 4 N.m (35 lb in).
3. Connect the MAF sensor harness connector.
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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