Exhaust System Check - Parked (Saturn)
- Remove oxygen sensor.
- Insert Exhaust Back Pressure Adapter (SA9306E) into exhaust manifold. The thread designation is M18 x 1.50.
- Connect Gauge Bar Set (SA9127E), 0-60 in. H2O (0-15 kPa) gauge to back pressure adapter.
- With engine at normal operating temperature, observe exhaust back pressure at 4000 RPM.
- The exhaust back pressure must be less than 20.13 in. H2O (5.0 kPa).