Restricted Exhaust
Restricted Exhaust
Diagnostic Aids
Caution: 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.
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 SA9127E Gage Bar Set, or the J35314-A Exhaust Back Pressure Gage.
Removing the heated oxygen sensor (HO2S) 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.
