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Home >> Buick >> 2011 >> Lucerne CX >> Repair and Diagnosis >> Engine Performance >> Engine Control Systems >> Engine Controls And Fuel - 3.9L - Repair Instructions >> Repair Instructions >> Air Cleaner Assembly Replacement >> Removal Procedure
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Removal Procedure

    Fig 1: Locating MAF/IAT Sensor Harness Electrical Connector
    GM1688912Courtesy of GENERAL MOTORS COMPANY
  1. Disconnect the engine harness electrical connector from the mass air flow (MAF)/intake air temperature (IAT) sensor.
    2. Fig 2: Identifying Positive Crankcase Ventilation Tube Quick Connect Fitting
    GM2146960Courtesy of GENERAL MOTORS COMPANY
  2. Disconnect the positive crankcase ventilation (PCV) tube quick connect fitting (1) from the air cleaner outlet duct. Refer to Plastic Collar Quick Connect Fitting Service .
    3. Fig 3: Locating Air Cleaner Outlet Duct Clamp
    GM2146964Courtesy of GENERAL MOTORS COMPANY
  3. Loosen the air cleaner outlet duct clamp (1) at the throttle body.
  4. Remove the air cleaner outlet duct from the throttle body.
    5. Fig 4: Identifying Air Cleaner Upper Housing
    GM1670787Courtesy of GENERAL MOTORS COMPANY
  5. Disengage the 3 integral clips (1) on the lower housing from the upper housing.
  6. Remove the air cleaner upper housing.
    7. Fig 5: Identifying Air Cleaner Lower Housing
    GM1664479Courtesy of GENERAL MOTORS COMPANY
  7. If replacing the air cleaner lower housing also, perform the following steps if not proceed to step 12.
  8. Remove the engine harness and powertrain control module (PCM) from the lower housing.
    9. Fig 6: Identifying Air Cleaner Lower Housing
    GM1674290Courtesy of GENERAL MOTORS COMPANY
  9. Pull up firmly on the lower housing in order to disengage the grommets from the studs. Remove the air cleaner lower housing.
    10. Fig 7: Identifying Air Cleaner Outlet Duct Clamp At MAF/IAT Sensor
    GM2146965Courtesy of GENERAL MOTORS COMPANY
    CAUTION:
    • Handle the MAF sensor carefully.
    • Do not drop the MAF sensor in order to prevent damage to the MAF sensor.
    • Do not damage the screen located on the air inlet end of the MAF.
    • Do not touch the sensing elements.
    • Do not allow solvents and lubricants to come in contact with the sensing elements.
    • Use a small amount of a soap based solution in order to aid in the installation.
  10. If replacing the air cleaner upper housing only perform the following steps, loosen the air cleaner outlet duct clamp (1) at the MAF/IAT sensor.
  11. Remove the air cleaner outlet duct.
    12. Fig 8: Locating MAF/IAT Sensor & Bolts
    GM1689169Courtesy of GENERAL MOTORS COMPANY
  12. Remove the MAF/IAT sensor bolts.
  13. Remove the MAF/IAT sensor.
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