Diagnostic Test

CHECKING THE EXHAUST SYSTEM FOR LEAKS

Turn the ignition off.

Raise the vehicle in accordance with the Service Information.

WARNING: The normal operating temperature of the exhaust system is very high. Never work around or attempt to service any part of the exhaust system until it has 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 operating time

Connect Exhaust Cone #8404-EC to Air Pressure Regulator (with hose) #W-18-MIL-1146AS.

CAUTION: The air pressure must not exceed 27.6 KPA (4 psi), otherwise engine damage can occur.

Attach shop air to the air pressure regulator.

Adjust the Air Pressure Regulator to 27.6 KPA (4 psi)

Insert the exhaust cone into the vehicle tail pipe.

If equipped with dual exhaust, plug the other exhaust pipe.

Apply Mopar® Air Leak Detector (or equivalent) to the following areas:

- All welded joints from 6 inches rearward of the downstream O2 sensor forward

- O2 sensor seal points

- O2 sensor boss welds

- Flange/joint connection(s)

- Exhaust manifold to cylinder head connection(s)

- EGR solenoid gasket base and tube seal points (if equipped)

Watch for the leak detector solution water to bubble.

Use the following definitions to help determine if system or component repair/replacement is necessary:

Type 1 Leak is defined as a leak where very small foam like bubbles approximately 1 mm (0.04 in.) or less appear.

Any Type 1 or greater leaks found in welded joints, O2 sensor seal points or O2 sensor boss welds must be repaired or the component must be replaced.

Type 2 Leak is defined as a leak where larger, pea size bubbles, approximately 8mm (0.31 in.) or greater appear.

Any Type 2 or greater leaks found in flange or joint connections, exhaust manifold to cylinder head connections, or EGR gasket and tube seal points must be repaired or the components must be replaced

Leak Location	Repair required if results at 4 psi reveal bubble size:
Welded joints	Type 1: 1 mm (0.04 in.) or greater
O2 Sensor seal points	Type 1: 1 mm (0.04 in.) or greater
O2 Sensor boss welds	Type 1: 1 mm (0.04 in.) or greater
Flange / joint connections	Type 2: 8 mm (0.31 in.) or greater
Exhaust Manifold to cylinder head connections	Type 2: 8 mm (0.31 in.) or greater
EGR gasket and tube seal points	Type 2: 8 mm (0.31 in.) or greater

If a leak is found that matches the above definition, repair or replace the component as necessary.

Once the repair is complete, repeat the procedure to verify that all leaks have been repaired.

Were any exhaust leaks found?

Yes

Repair or replace the leaking exhaust parts as necessary.
Perform PCM VERIFICATION TEST .

Test complete.