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.
2004 GMC Jimmy (CANADA) V6-4.3LFACTORY OEM SERVICE PROCEDURE
Air Flow Meter/Sensor: Service and Repair
MASS AIR FLOW (MAF) SENSOR REPLACEMENT
REMOVAL PROCEDURE
1. Turn OFF the ignition.
2. Disconnect the mass air flow (MAF) sensor harness connector.
NOTE: Refer to Mass Air Flow (MAF) Handling Notice in Service Precautions.
3. Remove the MAF sensor from the air cleaner cover and air cleaner outlet duct by loosening the hose clamps.
INSTALLATION PROCEDURE
IMPORTANT: The embossed arrow on the MAF sensor indicates the proper air flow direction. The arrow must point towards the engine.
1. Install the MAF sensor to the air cleaner outlet duct and the air cleaner cover.
2. Secure the air cleaner cover and outlet duct to the MAF sensor.
3. Connect the MAF sensor harness connector.
REMOVAL PROCEDURE
1. Turn OFF the ignition.
2. Disconnect the mass air flow (MAF) sensor harness connector.
NOTE: Refer to Mass Air Flow (MAF) Handling Notice in Service Precautions.
3. Remove the MAF sensor from the air cleaner cover and air cleaner outlet duct by loosening the hose clamps.
INSTALLATION PROCEDURE
IMPORTANT: The embossed arrow on the MAF sensor indicates the proper air flow direction. The arrow must point towards the engine.
1. Install the MAF sensor to the air cleaner outlet duct and the air cleaner cover.
2. Secure the air cleaner cover and outlet duct to the MAF sensor.
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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