Restricted Exhaust

Restricted Exhaust

Test Description

Warning

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

The numbers below refer to the step numbers in the diagnostic table.
3. 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 Exhaust Back Pressure Gauge.
Removing the heater oxygen sensor (HO2S) may set a diagnostic trouble code (DTC). When finishing this diagnostic table, be sure to clear all codes.
4. 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 the diagnostic procedure on the opposite exhaust pipe.