Restricted Exhaust

Restricted Exhaust

Special Tools

EN-35314-A - Exhaust Back Pressure Gauge

For equivalent regional tools, refer to Special Tools Tools and Equipment.

Diagnostic Aids

A quick check of exhaust flow will help determine for gasoline engines.

Test Description

The numbers below refer to the step numbers on 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 EN-35314-A - gauge.

Removing the heated oxygen sensor may set a 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 diagnostic procedure on the opposite exhaust pipe.