2011 Buick Lucerne SuperFACTORY OEM SERVICE PROCEDURE

Removal Procedure

    Fig 1: Locating MAF/IAT Sensor Connector
    GM1670786Courtesy of GENERAL MOTORS COMPANY
  1. Using a scan tool, retrieve the percentage of remaining engine oil and automatic transaxle fluid life. Record the remaining engine oil and transaxle fluid life.
  2. Ensure that the ignition is in the OFF position.
  3. Disconnect the negative battery cable. Refer to Battery Negative Cable Disconnection and Connection .
  4. Disconnect the engine harness electrical connector from the mass air flow/intake air temperature (MAF/IAT) sensor.
    5. Fig 2: Identifying PCV Fresh Air Tube
    GM1661022Courtesy of GENERAL MOTORS COMPANY
  5. Disconnect the positive crankcase ventilation (PCV) fresh air tube quick connect fitting from the air duct. Refer to Plastic Collar Quick Connect Fitting Service .
    6. Fig 3: Identifying Secondary AIR Pump Inlet Tube/Hose
    GM1665331Courtesy of GENERAL MOTORS COMPANY
  6. Disconnect the secondary air injection (AIR) pump inlet tube quick connect fitting from the air cleaner upper housing. Refer to Plastic Collar Quick Connect Fitting Service .
    7. Fig 4: View Of Air Cleaner Outlet Duct To Throttle Body
    GM1670790Courtesy of GENERAL MOTORS COMPANY
  7. Loosen the air cleaner outlet duct clamp at the throttle body.
  8. Remove the air cleaner outlet duct from the throttle body.
    9. Fig 5: Identifying Air Cleaner Upper Housing
    GM1670787Courtesy of GENERAL MOTORS COMPANY
  9. Disengage the lower housing clips (1).
  10. Disengage the upper housing front tabs from the lower housing.
  11. Remove the air cleaner upper housing.
    12. Fig 6: Identifying Air Cleaner Lower Housing
    GM1664479Courtesy of GENERAL MOTORS COMPANY
  12. Disengage the engine harness electrical connector lever locks at the ECM.
  13. Remove the engine harness electrical connectors from the ECM.
  14. Remove the ECM from the air cleaner lower housing.
Chapter Navigation
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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.