2009 Hummer H3 V8-5.3LFACTORY OEM SERVICE PROCEDURE

Air Flow Meter/Sensor: Service and Repair




Mass Airflow Sensor with Intake Air Temperature Sensor Replacement

Removal Procedure

Note: Use care when handling the mass air flow (MAF)/intake air temperature (IAT) sensor. Do not dent, puncture, or otherwise damage the honeycell located at the air inlet end of the MAF/IAT. Do not touch the sensing elements or allow anything including cleaning solvents and lubricants to come in contact with them. Use a small amount of a non-silicone based lubricant, on the air duct only, to aid in installation.

Factory service manual diagram



1. Disconnect the engine wiring harness electrical connector (1) from the MAF/IAT sensor.

Factory service manual diagram



2. Remove the MAF/IAT sensor screws (1).
3. Remove the MAF/IAT sensor (2) from the air cleaner upper housing.

Installation Procedure

Note: The embossed arrow on the MAF/IAT sensor indicates the proper air flow direction. The arrow must point toward the engine.

Factory service manual diagram



1. Install the MAF/IAT sensor (2) to the air cleaner upper housing.

Caution: Refer to Fastener Caution (Fastener Caution).

2. Install the MAF/IAT sensor screws (1).

Tighten the screws to 1.5 Nm (13 lb in).

Factory service manual diagram



3. Connect the engine wiring harness electrical connector to the MAF/IAT sensor.

Factory Service Tools

Use the Manual With the Right Hardware

Pair factory procedures with proven DIY tools so the instructions are easier to execute.

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When to See a Mechanic

Stop DIY work and contact a certified mechanic immediately if any of the following apply:

  • β€’ You smell fuel, burning insulation, or see smoke.
  • β€’ Brakes feel soft, pull hard to one side, or make grinding noises.
  • β€’ The engine overheats, stalls repeatedly, or misfires under load.
  • β€’ You are missing required tools, torque specs, or safe lifting equipment.
  • β€’ You are not confident in the next step or safety outcome.

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