Front

CATALYTIC CONVERTER -FRONT - 2.7L
REMOVAL
1. Disconnect negative battery cable.
2. Disconnect upstream oxygen sensor connector.





3. Remove 3 converter attaching nuts that are visible from the engine compartment (Fig. 5).
4. Raise vehicle on hoist.
5. Remove exhaust cross-under pipe.
6. Remove remaining bolt attaching converter to exhaust manifold.
7. Remove catalytic converter.
8. Remove and discard gasket.

INSPECTION

WARNING: THE NORMAL OPERATING TEMPERATURE OF THE EXHAUST SYSTEM IS VERY HIGH. THEREFORE, NEVER ATTEMPT TO SERVICE ANY PART OF THE EXHAUST SYSTEM UNTIL IT IS COOLED. SPECIAL CARE SHOULD BE TAKEN WHEN WORKING NEAR THE CATALYTIC CONVERTER. THE TEMPERATURE OF THE CONVERTER RISES TO A HIGH LEVEL AFTER A SHORT PERIOD OF ENGINE OPERATION TIME.

Check catalytic converter for a flow restriction. Refer to Exhaust System Restriction Check for procedure.
Visually inspect the catalytic converter element by using a borescope or equivalent. Remove both oxygen sensors and insert borescope. If borescope is not available, remove converter and inspect element using a flashlight. Inspect element for cracked or melted substrate.

NOTE: Before replacing a catalytic converter, determine the root cause of failure. Most catalytic converter failures are caused by air, fuel or ignition problems. Refer to appropriate Diagnostic Information for test procedures.

INSTALLATION
1. Clean manifold to converter sealing surfaces.
2. Position new gasket on converter inlet flange (Fig. 5).
3. Ensure exhaust manifold heat shield is in position, and loosely install converter with lower attaching bolt to exhaust manifold.
4. Lower vehicle.
5. Install 3 nuts attaching converter to manifold. Torque nuts to 28 Nm (250 inch lbs.).
6. Reconnect upstream oxygen sensor.
7. Raise vehicle.
8. Torque remaining attaching bolt to 28 Nm (250 inch lbs.).
9. Install cross-under pipe.
10. Lower vehicle.
11. Connect negative battery cable.
12. Start the engine and inspect for exhaust leaks. Repair exhaust leaks as necessary.
13. Check the exhaust system for contact with the body panels. Make the necessary adjustments, if needed.