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Home >> Saturn >> 2002 >> SC2 Automatic, MP6 >> Repair and Diagnosis >> Engine Performance >> System >> Engine Control System Testing & Engine Component Testing >> Emission Systems & Subsystems >> Exhaust Gas RECIRCULATION >> Exhaust System Check (Except Saturn)
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Exhaust System Check (Except Saturn)

WARNING: While engine is operating, the exhaust system will become extremely hot. To prevent burns avoid contacting a hot exhaust system.
  1. Remove the pre-catalyst HO2S sensor. Install the Exhaust Back Pressure Gauge (J 35314-A) in place of the HO2S sensor. Start and run the engine. Increase and monitor the engine speed at specified RPM. See EXHAUST BACKPRESSURE SPECIFICATIONS  table. Observe the exhaust system back pressure reading on the gauge. Does the reading exceed the specified value? If yes, go to next step. If no, go to step  6.
  2. Turn the engine off and place the ignition in the lock position. Remove the J 35314-A. Install the pre-catalyst HO2S sensor. Remove the post-catalyst HO2S sensor. Install the J 35314-A in place of the post HO2S sensor. Start and run the engine. Increase and monitor the engine at specified RPM. See EXHAUST BACKPRESSURE SPECIFICATIONS  table. Observe the exhaust system back pressure reading on the gauge. Does the reading exceed the specified value? If yes, go to next step. If no, go to step  4.
  3. Inspect the exhaust system for the following conditions:
    • Damage in the exhaust pipe.
    • Debris in the exhaust pipe.
    • Muffler or resonator internal failure.
    • Two-layer exhaust pipe separation.

    After repairs, go to step  5.

  4. Replace the catalytic converter. After repairs, go to next step.
  5. Remove the J 35314-A. Install the post-catalyst HO2S sensor. Clear any codes. Road test the vehicle in order to verify the repair. Did you find and correct the condition? If yes, system is okay. If no, go to step  1.
  6. Remove the J 35314-A. Install the pre-catalyst HO2S sensor. Clear any codes. Road test the vehicle in order to verify the repair. Did you find and correct the condition? If yes, system is okay. If no, go to step  1.
EXHAUST BACKPRESSURE SPECIFICATIONS

Engine RPM Pressure (PSI)
2.2L, 2.4L, 3.1L Malibu, 3.4L Alero & Grand Am, 3.8L Camaro & Firebird, & 5.7L Camaro, Corvette & Firebird 2000 2.0
3.1L Century & Grand Prix, 3.4L Impala & Monte Carlo, 3.5L, 3.8L Bonneville, Grand Prix, Impala, LeSabre, Monte Carlo, Park Avenue & Regal, 4.0L & 4.6L 2500 1.25
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