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SECTION 1G

ENGINE EXHAUST

DESCRIPTION AND OPERATION

EXHAUST SYSTEM

Notice : When you are inspecting or replacing exhaust system components, make sure there is adequate clearance from all points on the underbody to avoid possible overheating of the floor pane and possible damage to the passenger compartment insulation and trim materials.

Check the complete exhaust system and the nearby body areas and trunk lid for broken, damaged, missing or mispositioned parts, open seams, holes, loose connections, or other deterioration which could permit exhaust fumes to seep into the trunk or passenger compartment. Dust or water in the trunk may be an indication of a problem in one of these areas. Any defects should be corrected immediately.

MUFFLER

The exhaust system uses a flange and gasket-sealing design rather than a slip joint coupling design with clamp and U-bolts. If holes, open seams, or any deterioration is discovered upon inspection of the front muffler and pipe assembly, the complete assembly should be replaced. The same procedure is applicable to the rear muffler assembly.
Heat shields for the front and rear muffler assembly and the catalytic converter protect the vehicle and the environment from the high temperatures that the exhaust system develops.

CATALYTIC CONVERTER

Notice : When jacking or lifting the vehicle from the body side rails, be certain that the lift pads do not contact the catalytic converter, as this could damage the catalytic converter.

Notice : Use of anything other than unleaded fuel will damage the catalyst in the catalytic converter.

The catalytic converter is an emission-control device added to the exhaust system to reduce pollutants from the exhaust gas.
The oxidation catalyst is coated with a catalytic material containing platinum and palladium, which reduces levels of hydrocarbon (HC) and carbon monoxide (CO) from the exhaust gas. The three-way catalyst has coatings which contain platinum and rhodium, which additionally lower the levels of oxides of nitrogen (NOx).

THIRD MUFFLER

Third muffler is used in place of the catalytic converter for those vehicles using leaded fuel to reduce exhaust noise.

COMPONENT LOCATORZD

EXHAUST SYSTEM


UAA1G010
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  1. Metal Gasket
  2. Metal Gasket
  3. Auxiliary Catalytic Converter
  4. Nut
  5. Heated Oxygen Sensor
  6. Upper Bracket
  7. Bolt
  8. Exhaust Front Pipe
  9. Hanger Rubber
  10. Nut
  11. Nut
  12. Catalytic Converter Protective Shield
  13. Catalytic Converter Gasket
  14. Catalytic Converter
  15. Exhaust Connecting Pipe
  16. Exhaust Third Muffler
  17. Nut
  18. Nut
  19. Front Muffler Protective Shield
  20. Heated Lambda Sensor
  21. Nut
  22. Hanger Rubber
  23. Exhaust Front Muffler
  24. Rear Muffler Protective Shield
  25. Muffler Rear Gasket
  26. Hanger Rubber
  27. Exhaust Rear Muffler
  28. Hanger Rubber
  29. Exhaust Trim Ring

MAINTENANCE AND REPAIR

ON-VEHICLE SERVICE


UAA1B440
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AUXILIARY CATALYTIC CONVERTER

Removal and Installation Procedure

  1. Remove the exhaust manifold heat shield bolts and the heat shield.
    2. Installation Notice
    Tightening Torque
    15 N•m (11 lb-ft)

    UAA1B450
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  2. Remove the auxiliary catalytic upper flange nuts.
    3. Installation Notice
    Tightening Torque
    40 N•m (30 lb-ft)

    UAA1G090
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  3. Raise and suitably support the vehicle.
  4. Remove the auxiliary catalytic converter lower flange nuts and ring type from inlet/outlet flange of auxiliary catalytic converter gasket.
    5. Installation Notice
    Tightening Torque
    40 N•m (30 lb-ft)
  5. Remove the auxiliary catalytic converter.
  6. Installation should follow the removal procedure in the reverse order.

UAA1G030
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MAIN CATALYTIC CONVERTER

Removal and Installation Procedure

  1. Raise and suitably support the vehicle.
  2. Remove the nuts that secure the exhaust front pipe flange to the main catalytic converter flange.
    3. Installation Notice
    Tightening Torque
    30 N•m (22 lb-ft)
  3. Remove the gasket.

    4. UAA1G040
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  4. Remove the rubbers from hanger welded to front muffler pipe.
  5. Remove the nuts that secure the exhaust front muffler flange to the main catalytic converter flange.
    6. Installation Notice
    Tightening Torque
    30 N•m (22 lb-ft)
  6. Remove the gasket.
  7. Installation should follow the removal procedure in the reverse order.

UAA1G090
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EXHAUST FRONT PIPE

Removal and Installation Procedure

  1. Disconnect the negative battery cable.
  2. Raise and suitably support the vehicle.
  3. Remove the auxiliary catalytic converter lower flange nuts and ring type gasket.
    4. Installation Notice
    Tightening Torque
    40 N•m (30 lb-ft)

    UAA1G080
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  4. Disconnect the post converter heated oxygen sensor electrical connection. (if equiped)
  5. Remove the exhaust front pipe bracket nut.
    6. Installation Notice
    Tightening Torque
    25 N•m (18 lb-ft)

    UAA1G030
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  6. Remove the nuts that secure the exhaust front pipe flange to the main catalytic converter flange.
    7. Installation Notice
    Tightening Torque
    30 N•m (22 lb-ft)
  7. Remove the gasket from between the exhaust front pipe flange and the main catalytic converter flange.
  8. Remove the exhaust front pipe.
  9. Installation should follow the removal procedure in the reverse order.

UAA1G040
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MUFFLER - FRONT

Removal and Installation Procedure

  1. Disconnect the post converter heated oxygen sensor electrical connection. (if equiped)
  2. Remove the nuts that secure the front muffler pipe to the main catalytic converter flange.
    3. Installation Notice
    Tightening Torque
    30 N•m (22 lb-ft)
  3. Remove the gasket.
  4. Remove the rubber from hanger welded to front muffler pipe.

    5. UAA1G050
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  5. Remove the nuts that secure the front muffler pipe flange to the rear muffler pipe flange.
    6. Installation Notice
    Tightening Torque
    30 N•m (22 lb-ft)
  6. Remove the gasket.
  7. Remove the front muffler pipe.
  8. Installation should follow the removal procedure in the reverse order.
  9. Check the exhaust pipe and the front muffler box for holes, damage, open seams, or other deterioration that could permit exhaust fumes to seep into the passenger compartment or the trunk.

UAA1G0050
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MUFFLER - REAR

Removal and Installation Procedure

  1. Remove the nuts that secure the rear muffler pipe flange to the front muffler pipe flange.
    2. Installation Notice
    Tightening Torque
    30 N•m (22 lb-ft)
  2. Remove the gasket.

    3. UAA1G060
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  3. Loosen the bolt that secures the trim ring to the rear muffler pipe.
    4. Installation Notice
    Tightening Torque
    15 N•m (11 lb-ft)
  4. Remove the trim ring.

    5. UAA1G070
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  5. Detach the rear muffler from the rubber hangers.
  6. Remove the rear exhaust muffler assembly.
  7. Check the exhaust pipe and the rear muffler box for holes, damage, open seams, or other deterioration that could permit exhaust fumes to seep into the passenger compartment or the trunk.
  8. Installation should follow the removal procedure in the reverse order.

SPECIFICATIONS

FASTENER TIGHTENING SPECIFICATIONS

Application
N•m
Lb-Ft
Lb-In
Exhaust Manifold-to-Auxiliary Catalytic Converter Nuts
40
30
-
Auxiliary Catalytic Converter-to-Exhaust Front Pipe Nuts
40
30
-
Exhaust Front Pipe Bracket Bolt
25
18
-
Exhaust Front Pipe-to-Main Catalytic Converter Nuts
30
22
-
Main Catalytic Converter-to-Front Muffler Pipe Nuts
30
22
-
Front Muffler Pipe-to-Rear Muffler Pipe Nuts
30
22
-
Exhaust Manifold Heat Shield Bolts
15
11
-
Heated Oxygen Sensor
41
30
-


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