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HOMESERVICE MANUALSPONTIAC2008GRAND PRIX BASEREPAIR AND DIAGNOSISEXTERNAL PAGESDIFFERENT VARIANT/TRIMSECTION 1 (ENGINE MECHANICAL - 5.3L)REPAIR INSTRUCTIONS - ON VEHICLEENGINE REPLACEMENTINSTALLATION PROCEDURE
2008 Pontiac Grand Prix Base

Installation Procedure

2008 Pontiac Grand Prix BaseSECTION Installation Procedure
WARNING: This page is about a different variant/trim than selected.
    Fig 1: View Of Transaxle To Engine Bolts & Stud
    GM1561328Courtesy of GENERAL MOTORS CORP.
  1. Using a suitable engine lift, remove the engine from the engine stand.
  2. Position and install the engine to the frame and the transaxle.
    3. NOTE: Refer to Fastener Notice .
  3. Install the transaxle to engine bolts (1) and stud (2).

    Tighten:  Tighten the bolts/stud to 75 N.m (55 lb ft).

    4. Fig 2: View Of Engine Mount Bracket Nuts
    GM1551859Courtesy of GENERAL MOTORS CORP.
  4. Install the rear engine mount to frame nuts.

    Tighten:  Tighten the nuts to 50 N.m (37 lb ft).

    5. Fig 3: View Of Lower Engine Mount
    GM1551858Courtesy of GENERAL MOTORS CORP.
  5. Install the front engine mount to frame nuts.

    Tighten:  Tighten the nuts to 50 N.m (37 lb ft).

    6. Fig 4: View Of Engine Frame Rear Bolts
    GM1561297Courtesy of GENERAL MOTORS CORP.
  6. Ensure that all hoses, wires, and pipes clear the vehicle during the installation process.
  7. With the aid of an assistant, raise the J 39580  and/or lower the vehicle to install the engine and frame to the vehicle.
  8. Install the engine frame rear bolts.

    Tighten:  Tighten the bolts to 160 N.m (118 lb ft).

    9. Fig 5: View Of Engine Frame Front Bolts
    GM1561294Courtesy of GENERAL MOTORS CORP.
  9. Install the engine frame front bolts.

    Tighten:  Tighten the bolts to 145 N.m (107 lb ft).

    10. Fig 6: Identifying Utility Stand
    GM333118Courtesy of GENERAL MOTORS CORP.
  10. Install radiator to front frame brackets.
  11. Lower the J 39580  , or raise the vehicle to preload the weight of the engine, frame, and front suspension.
  12. Remove the support from under the rear of the vehicle.
  13. Raise the vehicle enough to remove the J 39580  from under the engine, frame, and front suspension.
    14. Fig 7: View Of Flywheel Bolts
    GM1561291Courtesy of GENERAL MOTORS CORP.
  14. Connect the exhaust system and connect the O2 sensor harness pigtail. Refer to Catalytic Converter Replacement (LS4) .
  15. Install the flywheel bolts.

    Tighten:  Tighten the bolts to 63 N.m (47 lb ft).

    16. Fig 8: View Of Transaxle Converter Cover & Bolt/Stud
    GM1561287Courtesy of GENERAL MOTORS CORP.
  16. Install the converter cover.
  17. Install the transaxle converter cover bolt/stud.

    Tighten:  Tighten the bolt/stud to 10 N.m (89 lb in).

  18. Install the left and right wheel drive shafts into the transaxle. Refer to Wheel Drive Shaft Replacement .
    19. Fig 9: Battery Cable Retainers
    GM1552771Courtesy of GENERAL MOTORS CORP.
  19. Install the battery cable retainers to the engine frame.
  20. Install the front air deflector. Refer to Radiator Air Lower Baffle and Deflector Replacement .
    21. Fig 10: Battery Positive & Negative Cables
    GM1552773Courtesy of GENERAL MOTORS CORP.
  21. Install the cable ground terminal (6) to the stud.
  22. Install the battery cable ground nut (1).

    Tighten:  Tighten the nut to 30 N.m (22 lb ft).

  23. Install the cable terminal (2) to the starter.
  24. Install the positive battery cable nut (3) to the starter.

    Tighten:  Tighten the nut to 10 N.m (89 lb in).

    25. Fig 11: View Of Transaxle Oil Cooler Lines
    GM1561300Courtesy of GENERAL MOTORS CORP.
  25. Connect the transaxle oil cooler lines to the transaxle. Refer to Transmission Fluid Cooler Hose/Pipe Quick-Connect Fitting Disconnection and Connection .
  26. Install the transaxle oil cooler line bracket bolt/stud.

    Tighten:  Tighten the bolt/stud to 25 N.m (18 lb ft).

    27. Fig 12: View Of Power Steering Hose & Inlet Pipe
    GM1561279Courtesy of GENERAL MOTORS CORP.
  27. Install the power steering hose (2) to the inlet pipe.
  28. Tighten the power steering hose clamp at the inlet pipe.

    Tighten:  Tighten the clamp to 6 N.m (53 lb in).

  29. Connect the power steering pipe to the steering gear.
  30. Connect the power steering pipe to the frame clips.
  31. Lower the vehicle.
    32. Fig 13: View Of Upper Strut Nuts
    GM1561271Courtesy of GENERAL MOTORS CORP.
  32. Position and install the ball joint nuts. Refer to Lower Control Arm Ball Joint Replacement .
  33. Install the sway links to the stabilizer shaft. Refer to Stabilizer Shaft Link Replacement .
  34. Install the tie rod ends to the steering knuckles. Refer to Rack and Pinion Outer Tie Rod End Replacement .
  35. Connect the wheel speed sensor electrical connectors.
  36. Connect the wheel speed sensor wiring harness to the lower control arm.
    37. Fig 14: Heater Inlet & Outlet Hoses
    GM1561305Courtesy of GENERAL MOTORS CORP.
  37. Install the heater inlet (2) and outlet (1) hoses to the heater inlet/outlet pipe.
  38. Using the J 38185  position the heater inlet and outlet hose clamps.
    39. Fig 15: Intermediate Shaft, Bolt & Steering Gear
    GM1561276Courtesy of GENERAL MOTORS CORP.
  39. Install the intermediate shaft to the steering gear.
  40. Install the intermediate shaft to steering gear bolt.

    Tighten:  Tighten the bolt to 48 N.m (35 lb ft).

  41. Position the intermediate shaft lower boot.
    42. Fig 16: Engine Wiring Harness Routing
    GM1561325Courtesy of GENERAL MOTORS CORP.
  42. Route all branches of the engine wiring harness to their correct locations.
  43. Connect the engine harness electrical connector to the VSS.
    44. Fig 17: Vehicle Speed Sensor (VSS) Shield, Nut & Bolt
    GM1561324Courtesy of GENERAL MOTORS CORP.
  44. Install the VSS shield (2). Install the VSS shield nut (1) and bolt (3).

    Tighten:  Tighten the bolt/nut to 25 N.m (18 lb ft).

    45. Fig 18: View Of Shift Cable At Transaxle
    GM1561282Courtesy of GENERAL MOTORS CORP.
  45. Install the shift cable to the bracket.
  46. Connect the shift cable to the transaxle selector lever stud.
  47. Install the shift cable clip.
    48. Fig 19: Crankshaft Position (CKP) Sensor Harness & Power Steering Gear Harness To Engine Harness Electrical Connectors
    GM1561321Courtesy of GENERAL MOTORS CORP.
  48. Install the clip attaching the power steering gear harness to the bracket.
  49. Connect the engine harness electrical connector (1) to the CKP sensor harness.
  50. Connect the engine harness electrical connector (2) to the power steering gear harness.
    51. Fig 20: Camshaft Position (CMP) Sensor Electrical Connector
    GM1554556Courtesy of GENERAL MOTORS CORP.
  51. Connect the camshaft position sensor lead to the sensor.
    52. Fig 21: Transmission Control Module, Engine Control Module & A/C Pressure Sensor Electrical Connectors
    GM1561318Courtesy of GENERAL MOTORS CORP.
  52. Connect the following electrical connectors:
    • TCM (1)
    • ECM (2)
    • A/C pressure sensor (3)
  53. Install the air cleaner assembly. Refer to Air Cleaner Element Replacement .
    54. Fig 22: Engine Harness Electrical Connector & Electronic Brake Control Module (EBCM)
    GM1561316Courtesy of GENERAL MOTORS CORP.
  54. Connect the engine harness electrical connector to the EBCM.
    55. Fig 23: Engine Harness Electrical Connector At ABS Module
    GM1561314Courtesy of GENERAL MOTORS CORP.
  55. Connect the engine harness electrical connector to the ABS module.
    56. Fig 24: Engine Harness Connector & Bolt
    GM1561310Courtesy of GENERAL MOTORS CORP.
  56. Install the engine harness connector to the bracket. Tighten the engine harness connector bolt (1).

    Tighten:  Tighten the bolt to 10 N.m (89 lb in).

    57. Fig 25: View Of Bussed Electrical Center (BEC) Cover & Fuse Block
    GM1561307Courtesy of GENERAL MOTORS CORP.
  57. Position the fuse block. Tighten the 4 integral bolts (2) attaching the fuse block.

    Tighten:  Tighten the bolts to 10 N.m (89 lb in).

  58. Install the electrical center cover (1).
    59. Fig 26: View Of Fuel Feed Line & Evaporative Emission (EVAP) Line
    GM1551868Courtesy of GENERAL MOTORS CORP.
  59. Connect the fuel feed line (1) to the fuel rail. Refer to Metal Collar Quick Connect Fitting Service .
  60. Connect the EVAP line (2) to the purge solenoid. Refer to Plastic Collar Quick Connect Fitting Service .
    61. Fig 27: View Of Master Cylinder & Nuts
    GM1561262Courtesy of GENERAL MOTORS CORP.
  61. Remove the mechanic's wire holding the master cylinder. Position the master cylinder to the brake booster.
  62. Install the master cylinder nuts.

    Tighten:  Tighten the nuts to 33 N.m (24 lb ft).

    63. Fig 28: Anti Lock Brake (ABS) Module Brake Pipe Fittings
    GM1561268Courtesy of GENERAL MOTORS CORP.
  63. Connect the brake pipe fittings (1, 2) to the ABS module.

    Tighten:  Tighten the fittings to 15 N.m (11 lb ft).

    64. Fig 29: Master Cylinder Brake Pipe Fittings
    GM1561264Courtesy of GENERAL MOTORS CORP.
  64. Connect the from brake pipe fittings (1, 2) to the master cylinder.

    Tighten:  Tighten the fittings to 30 N.m (22 lb ft).

    65. Fig 30: Engine Harness Electrical Connectors & Brake Fluid Level Switch Electrical Connector
    GM1561313Courtesy of GENERAL MOTORS CORP.
  65. Connect the brake fluid level switch electrical connector (3) to the master cylinder.
  66. Connect the engine harness electrical connectors (1, 2) to the I/P harness electrical connectors.
    67. Fig 31: View Of Brake Booster Vacuum Hose
    GM1551866Courtesy of GENERAL MOTORS CORP.
  67. Install the brake booster vacuum hose (1) to the intake manifold (2).
  68. Install the brake booster vacuum hose to the brake booster (3).
    69. Fig 32: A/C Compressor Hose & Nut At A/C Condenser
    GM1562061Courtesy of GENERAL MOTORS CORP.
  69. Install the A/C compressor hose.
  70. Install the A/C compressor hose nut at the A/C condenser.

    Tighten:  Tighten the nut to 16 N.m (12 lb ft).

    71. Fig 33: A/C Compressor Hose Nut & A/C Receiver/Dehydrator Tube
    GM1562059Courtesy of GENERAL MOTORS CORP.
  71. Install the A/C compressor hose.
  72. Install the A/C compressor hose nut at the A/C receiver/dehydrator tube.

    Tighten:  Tighten the nut to 16 N.m (12 lb ft).

    73. Fig 34: Outlet Hose At Radiator
    GM1524227Courtesy of GENERAL MOTORS CORP.
  73. Install the outlet hose to the radiator.
  74. Connect the outlet hose clips to the fan shroud.
  75. Using the J 38185  position the outlet hose clamp at the radiator.
    76. Fig 35: Inlet Hose At Radiator
    GM1524230Courtesy of GENERAL MOTORS CORP.
  76. Install the inlet hose to the radiator.
  77. Using the J 38185  position the inlet hose clamp at the radiator.
  78. Install the front tires and wheels. Refer to Tire and Wheel Removal and Installation .
  79. Connect the negative battery cable. Refer to Battery Negative Cable Disconnection and Connection (LS4) .
  80. Install the right fender diagonal brace. Refer to Front Fender Upper Diagonal Brace Replacement .
  81. Refill the engine with oil.
  82. Recharge the A/C system. Refer to Refrigerant Recovery and Recharging .
  83. Refill the cooling system. Refer to Cooling System Draining and Filling (LS4 GE 47716 Fill) or Cooling System Draining and Filling (LS4 Static Fill) .
  84. Bleed the brake system. Refer to Hydraulic Brake System Bleeding (Manual) or Hydraulic Brake System Bleeding (Pressure) .
  85. Check the transaxle fluid level, add fluid if necessary. Refer to Transmission Fluid Check .
  86. Install the engine sight shield. Refer to Upper Intake Manifold Sight Shield Replacement .
  87. Run the engine and inspect for leaks.
RENDER: 1.0x

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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.