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Home >> Saturn >> 2000 >> SW2 Automatic >> Repair and Diagnosis >> Engine Mechanical >> Engine Exhaust System >> Diagnostics >> Restricted Exhaust System Check >> Test Method (Performed During Test):
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Test Method (Performed During Test):

  1. Remove the oxygen sensor.
  2. Install gauge bar set (SA9127E) into the exhaust manifold. The thread designation is M18X1.50.
    NOTE: Do not use the 0-60 in. HO gage when performing this test, as it will be permanently damaged due to the excessive back pressure during accelerations. Use the 0-690 kPa (0-100 psi) gauge and appropriate hoses in service gauge bar kit SA9127E.
  3. Connect the gauge bar set (SA9127E), 0-861 kPa (0-100 psi) gauge.
  4. With the engine at normal operating temperature, perform a 15 mph road test. Automatic transaxles should be in "D" and manual Transaxles in "3rd" gear. Maximum exhaust back pressure readings are taken during short wide open throttle accelerations.
    NOTE: If the exhaust pressure exceeds the specification, inspect for a dented or collapsed exhaust pipe. It may be necessary to disconnect the exhaust pipe before or behind the converter and repeat Step 4 . If removing the muffler does not lower the back pressure, disconnect the three way catalytic converter from the front exhaust pipe and repeat the test.
  5. The maximum exhaust back pressure during wide open throttle accelerations must be less than 50 kPa (7.25 psi).
  6. Replace any part of the exhaust system found to be damaged.
  7. Install anti-seize on the oxygen sensor's threads and install the sensor. It may be necessary to disconnect the negative battery terminal in order to clear any codes set while operating the engine with the oxygen sensor removed or disconnected.
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