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Home >> Buick >> 2007 >> Lucerne CX >> Repair and Diagnosis >> External Pages >> Different variant/trim >> Section 13 (Engine Mechanical - 4.6L (3 Of 5)) >> Off-Vehicle Repair Instructions (1 Of 3) >> Exhaust Manifold Removal - Left Side (W/O RPO NC1 or NF7)

Exhaust Manifold Removal - Left Side (W/O RPO NC1 or NF7)

WARNING: This page is about a different variant/trim than selected.
    Fig 1: Identifying Oxygen Sensor
    GM331274Courtesy of GENERAL MOTORS CORP.
  1. Remove the oxygen sensor (1) and inspect the sensor for excessive deposits or damage. Replace the oxygen sensor if necessary.
    2. Fig 2: Identifying Left Exhaust Manifold
    GM315063Courtesy of GENERAL MOTORS CORP.
  2. Remove the exhaust manifold to exhaust intermediate pipe bolts (3).
  3. Remove the exhaust manifold bolts (6).
  4. Remove the exhaust manifold (2).
    5. IMPORTANT: DO NOT reuse the exhaust manifold to exhaust intermediate pipe gasket.
  5. Remove and discard the exhaust manifold to exhaust intermediate pipe gasket (5).
    6. IMPORTANT: DO NOT reuse the exhaust manifold gasket.
  6. Remove and discard the exhaust manifold gasket (1).
    7. Fig 3: Identifying EGR Valve Inlet Pipe
    GM1564244Courtesy of GENERAL MOTORS CORP.
  7. Remove the exhaust gas recirculation (EGR) valve inlet pipe bolt from the water crossover.
    8. Fig 4: Identifying EGR Valve Inlet Pipe Nut
    GM1564088Courtesy of GENERAL MOTORS CORP.
  8. Disconnect the EGR valve inlet pipe nut (1) from the fitting on the exhaust intermediate pipe.
    9. Fig 5: Identifying EGR Valve Inlet Pipe
    GM1564091Courtesy of GENERAL MOTORS CORP.
  9. Remove and discard the EGR valve inlet pipe.
    10. Fig 6: Identifying Engine Rear Lift Bracket
    GM1564093Courtesy of GENERAL MOTORS CORP.
  10. Remove the engine rear lift bracket bolts.
  11. Remove the engine rear lift bracket.
    12. Fig 7: View Of Exhaust Intermediate Pipe Bolts
    GM1564094Courtesy of GENERAL MOTORS CORP.
  12. Remove the exhaust intermediate pipe bolts.
    13. Fig 8: Identifying Exhaust Intermediate Pipe
    GM1564095Courtesy of GENERAL MOTORS CORP.
  13. Remove the exhaust intermediate pipe.
    14. Fig 9: Locating Left Side Coolant Heater
    GM350279Courtesy of GENERAL MOTORS CORP.
  14. If equipped, remove the left coolant heater (1) as follows:
    1. Remove the coolant heater bolt.
    2. Remove the coolant heater from the cylinder block.
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