Test Description

WARNING: This page is about a different car, the 2002 Oldsmobile Aurora. However, it is still accessible from the selected car via links, so may be relevant.

NOTE: Tools Required: J 35314-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 J 35314-A.
Removing the 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.

Fig 1: Restricted Exhaust (1 Of 2)

Courtesy of GENERAL MOTORS CORP.

Fig 2: Restricted Exhaust (2 Of 2)

Courtesy of GENERAL MOTORS CORP.