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HOMESERVICE MANUALSSATURN2000SL2 AUTOMATIC, MP6REPAIR AND DIAGNOSISENGINE MECHANICALENGINE EXHAUST SYSTEMDIAGNOSTICSRESTRICTED EXHAUST SYSTEM CHECKTEST METHOD (VEHICLE PARKED)
2000 Saturn SL2 Automatic, MP6

Test Method (Vehicle Parked)

2000 Saturn SL2 Automatic, MP6SECTION Test Method (Vehicle Parked)
  1. Remove the oxygen sensor.
  2. Insert Gauge Bar Set SA9127E into the exhaust manifold. The thread designation is M18 x 1.50.
    NOTE: Do not use the 0-60 in. H2 O 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, 0-15 kPa gage (0-60 in. H2 O to the back pressure adaptor.
    Fig 1: Testing Exhaust Back Pressure
    G01068115Courtesy of GENERAL MOTORS CORP.
  4. With the engine at normal operating temperature, observe the exhaust back pressure at 4000 RPM.
    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 exhaust back pressure must be less than 5.0 kPa (20.13 in. H2 O).
RENDER: 1.0x

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When to See a Mechanic

Stop DIY work and contact a certified mechanic immediately if any of the following apply:

  • • You smell fuel, burning insulation, or see smoke.
  • • Brakes feel soft, pull hard to one side, or make grinding noises.
  • • The engine overheats, stalls repeatedly, or misfires under load.
  • • You are missing required tools, torque specs, or safe lifting equipment.
  • • You are not confident in the next step or safety outcome.