Restricted Exhaust

Restricted Exhaust

Tools Required
- J 35314-A Exhaust Back Pressure Gage

Diagnostic Aids

Caution: Refer to Hot Exhaust System Caution in Service Precautions.
Hot Exhaust System Caution

For dual exhaust systems a quick check of exhaust flow will help determine which side of the exhaust system is restricted. The side that has less exhaust flow is the side that will be suspect, and diagnosis should begin there.

Restricted Exhaust / Steps 1 - 5:

Restricted Exhaust / Steps 6 - 8:

Test Description
The numbers below refer to the step numbers on the diagnostic table.
4. The exhaust system has very low back pressure under normal conditions. If the exhaust system is restricted, a significant increase in the exhaust pressure is noticed on the J 35314-A. Removing the H02S sensor may set a DTC. When finishing this diagnostic table, be sure to clear all codes.
5. This step will isolate the catalytic converter from the remainder of the exhaust system.
8. Confirming that the condition has been fixed is essential. If the symptom still exists and the vehicle has a dual exhaust system, proceed to step 2 and repeat diagnostic procedure on the opposite exhaust pipe.