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Home >> Buick >> 2009 >> Lucerne CX, 3.9 1 >> Repair and Diagnosis >> Engine Performance >> System >> Engine Controls And Fuel - 3.9L - Introduction >> Repair Instructions >> Air Cleaner Assembly Replacement >> Removal Procedure

Removal Procedure

    Fig 1: Locating MAF/IAT Sensor Harness Electrical Connector
    GM1688912Courtesy of GENERAL MOTORS CORP.
  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 CORP.
  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: Identifying Secondary Air Injection Pump Inlet Hose Quick Connect Fitting
    GM1755968Courtesy of GENERAL MOTORS CORP.
  3. Disconnect the secondary air injection (AIR) hose quick connect fitting (1) from the air cleaner, if equipped. Refer to Plastic Collar Quick Connect Fitting Service .
    4. Fig 4: Locating Air Cleaner Outlet Duct Clamp
    GM2146964Courtesy of GENERAL MOTORS CORP.
  4. Loosen the air cleaner outlet duct clamp (1) at the throttle body.
  5. Remove the air cleaner outlet duct from the throttle body.
    6. Fig 5: Identifying Lower Housing Clips
    GM1670787Courtesy of GENERAL MOTORS CORP.
  6. Disengage the 3 integral clips (1) on the lower housing from the upper housing.
  7. Remove the air cleaner upper housing.
    8. Fig 6: Locating ECM Harness Electrical Connector
    GM1664479Courtesy of GENERAL MOTORS CORP.
  8. If replacing the air cleaner lower housing also, perform the following steps if not proceed to step 12.
  9. Remove the engine harness and powertrain control module (PCM) from the lower housing.
    10. Fig 7: Identifying Air Cleaner Lower Housing
    GM1674290Courtesy of GENERAL MOTORS CORP.
  10. Pull up firmly on the lower housing in order to disengage the grommets from the studs. Remove the air cleaner lower housing.
    11. Fig 8: Identifying Air Cleaner Outlet Duct Clamp At MAF/IAT Sensor
    GM2146965Courtesy of GENERAL MOTORS CORP.
    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.
  11. 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.
  12. Remove the air cleaner outlet duct.
    13. Fig 9: Locating MAF/IAT Sensor & Bolts
    GM1689169Courtesy of GENERAL MOTORS CORP.
  13. Remove the MAF/IAT sensor bolts.
  14. Remove the MAF/IAT sensor.
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