Restricted Exhaust
Restricted ExhaustDiagnostic Aids
Caution: If the vehicle is equipped with a 6.5 L diesel engine do not perform this diagnostic. The exhaust system does not have a location for installing the J35314-A. Instead remove the suspect component, operate the vehicle, verify for improved performance. If performance is improved then replace the faulty component.
Test Description
Tools Required
^ J35314-A Exhaust Back Pressure Gage
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 J35314-A.Removing the AIR check valve or HO2S 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.
Steps 1 - 8:
Restricted Exhaust