Restricted Exhaust

Restricted Exhaust

Special Tools

J 35314-A Exhaust Back Pressure Gage

Diagnostic Aids

Warning

While engine is operating, the exhaust system will become extremely hot. To prevent burns avoid contacting a hot exhaust system.

Test Description

The numbers below refer to the step numbers on the diagnostic table.

Note: Removing the O2S sensor may set a DTC. When finishing this diagnostic table, be sure to clear all codes.

4. The exhaust system has very low backpressure under normal conditions. If the exhaust system is restricted, a significant increase in exhaust pressure is noticed on the J 35314-A.
5. This step will isolate the catalytic converter from the remainder of the exhaust system.
7. 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.