Question about Pontiac Bonneville

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For a 94' pontiac bonneville 3.8L I need to know the torque specs and sequnces for the intake manifold and exhaust manifolds. Can someone please help me out?

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  • ismael120her Feb 08, 2010

    Yea thanks alot man. There should be more "experts" like you on here.

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  • Pontiac Master
  • 17,970 Answers

GM Bonneville/Eighty Eight/LeSabre 1986-1999
Intake Manifold - 1991-97 Vehicles
(except 1995-97 VIN 1 AND K engines)

  1. Remove the plastic engine cover and air intake duct.
  2. Properly relieve the fuel system pressure, as outlined in of this repair guide. If not already done, disconnect the negative battery cable.
  3. Tag and disconnect the spark plug wires on the right side of the engine and set aside.
  4. Remove the fuel rail from the vehicle.
  5. Remove the exhaust crossover heat shield.
  6. Unfasten the cable bracket-to-cylinder head mounting bolt.
  7. Remove the power steering pump bracket.
  8. Loosen the alternator mounting bolts, then position the alternator aside for clearance.
  9. Remove the alternator bracket.
  10. Disconnect the heater pipes and bypass hose.
  11. Unfasten the retaining bolts, then remove the intake manifold from the vehicle. Remove and discard the gasket and thoroughly clean the gasket mating surfaces and intake manifold bolts and bolt holes.
for a 94' pontiac bonneville - a237496.gif
Fig. Fig. 18: Exploded view of the intake manifold and gaskets - 12763.8L (VIN C) engine shown, later models similar


fd34f89.gif Fig. Fig. 19: Intake manifold bolt tightening sequence - 1276-95 vehicles
To install:
  1. Apply a suitable sealer to the ends of the manifold seals.
  2. Position a new intake manifold gasket, then place the intake manifold over it. Apply a suitable threadlocking sealer to the retaining bolts, then install and tighten them twice, in the sequence shown in the accompanying figure, to 23 inch lbs. (10 Nm).
  3. Connect the bypass hose and the heater pipes.
  4. Install the alternator bracket. Move the alternator into position, then tighten the mounting bolts.
  5. Install the power steering pump bracket.
  6. Tighten the cable bracket-to-cylinder head mounting bolt.
  7. Install the exhaust crossover heat shield.
  8. Install the fuel rail in the vehicle.
  9. Connect the right side spark plug wires, as tagged during removal.
  10. Connect the negative battery cable.
  11. Install the air intake duct and engine cover.
continue...

Posted on Feb 08, 2010

  • ZJ Limited
    ZJ Limited Feb 08, 2010

    GM Bonneville/Eighty Eight/LeSabre 1986-1999
    Exhaust Manifold
    1993-99 3.8L (VIN 1 and K) Engine
    right side (rear)





    1. Disconnect the negative battery cable.


    2. Tag and disconnect the spark plug wires from the spark plugs.


    3. If equipped with a supercharged engine, remove the throttle cable bracket. Remove the crossover pipe heat shield.


    4. Remove the transaxle oil level indicator and indicator tube.


    5. Detach the oxygen sensor lead.


    6. Unfasten the two bolts attaching the right exhaust manifold to the crossover pipe or left exhaust manifold, as applicable.


    7. Remove the vacuum reservoir, mounted on the cowl.


    8. Raise and safely support the vehicle.


    9. Remove the front exhaust pipe-to-exhaust manifold attaching nuts.


    10. Separate the front exhaust pipe from the exhaust manifold.


    11. Carefully lower the vehicle.


    12. Remove the engine lift bracket.



    Fig. Fig. 14: Remove the engine lift bracket - 1993-99 VIN 1 and K engines







    1. Unfasten the exhaust manifold studs, then remove the manifold from the vehicle.


    2. Remove and discard the gasket, then thoroughly clean the gasket mating surfaces.



    Fig. Fig. 15: Exploded view of the right side manifold, gasket and retaining studs - 1993-99 VIN 1 and K engines



    To install:




    1. Install a new gasket, then position the exhaust manifold. Secure
      with the retaining studs and tighten to 38 ft. lbs. (51 Nm) for 1993-95
      vehicles or to 2 ft. lbs. (30 Nm) for 1996-99 vehicles.



    2. Install the engine lift bracket.


    3. Raise and safely support the vehicle.


    4. Attach the front exhaust pipe to the manifold.


    5. Carefully lower the vehicle.


    6. Install the vacuum reservoir, mounted on the cowl.


    7. Install the two bolts attaching the right exhaust manifold to the
      left manifold or crossover pipe, as applicable. Tighten the bolts to 15
      ft. lbs. (20 Nm).



    8. Attach the oxygen sensor lead.


    9. Install the transaxle oil level indicator and indicator tube.


    10. For supercharged engines, install the crossover pipe heat shield and the throttle cable bracket.


    11. Attach the spark plug wires to the spark plugs, as tagged during removal.


    12. Connect the negative battery cable.





    Left side (front)
    See Figure 16




    1. Disconnect the negative battery cable.


    2. Unfasten the two bolts attaching the left exhaust manifold to the crossover pipe or right exhaust manifold, as applicable.


    3. Tag and disconnect the spark plug wires from the spark plugs.


    4. Remove the oil level indicator and tube.


    5. Remove the manifold studs and bolts, then remove the manifold
      from the vehicle. Remove and discard the gasket and thoroughly clean
      the gasket mating surfaces.






    Fig. Fig. 16: Left exhaust manifold attachment - 1993-99 VIN 1 and K engines
    To install:




    1. Install a new gasket, then position the exhaust manifold.


    2. Install the oil level indicator tube and indicator.


    3. Install the manifold studs and bolts. Tighten to 38 ft. lbs. (51
      Nm) for 1993-95 vehicles or to 2 ft. lbs. (30 Nm) for 1996-99 vehicles.



    4. Connect the spark plug wires to the plugs, as tagged during removal.


    5. Install the two bolts attaching the left exhaust manifold to the
      right exhaust manifold or crossover pipe, as applicable. Tighten the
      bolts to 15 ft. lbs. (20 Nm).



    6. Connect the negative battery cable.

    Hope this help.


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    a5adffa.jpg
    Fig. Exploded view of the intake manifold and related components-3.8L (VIN K) engine
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140d431.jpg
Fig. Upper intake manifold torque sequence-3.8L (VIN K) engine


4950e4f.jpg
Fig. Lower intake manifold torque sequence-3.8L (VIN K) engine
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