LEMON Manuals: Even more car manuals for everyone: 1960-2025
Home >> Saturn >> 1998 >> SW2 Standard >> Repair and Diagnosis >> Engine Performance >> System >> Engine Controls - System/Component Tests >> Emission Systems & Sub-Systems >> Exhaust Gas RECIRCULATION >> Exhaust System Check
April 5, 2026: LEMON Manuals is launched! Read the announcement.

Exhaust System Check

  1. If powertrain OBD system check has been performed, go to next step. If powertrain OBD system check has not been performed, perform powertrain OBD system check. See POWERTRAIN OBD SYSTEM CHECK in TESTS W/CODES article.
  2. Remove heated oxygen sensor. Install exhaust backpressure tester in place of oxygen sensor. Start engine and let idle. If pressure reading is not 1.25 psi or greater on all models except 2.4L engine, or .5 psi or greater on 2.4L engine, go to next step. If pressure reading is 1.25 psi or greater on all models except 2.4L engine, or .5 psi or greater on 2.4L engine, go to step 4).
  3. Increase engine speed to 2000 RPM (3000 RPM on 2.4L). If pressure reading is greater than 3 psi on all models except 2.4L engine, or .75 psi or greater on 2.4L engine, go to next step. If pressure reading is not greater than 3 psi on all models except 2.4L engine, or .75 psi or greater on 2.4L engine, go to step 6).
  4. Check exhaust system for crushed pipe, internal muffler damage or heat distress. If problem does not exist, go to next step. If problem exists, repair as necessary and go to step 6).
  5. Replace catalytic converter and go to next step.
  6. Operate vehicle within conditions under which original symptom was noted. If system operate properly, system is okay at this time. If system does not operate properly, go to step 2).
scientia non olet · About LEMON Manuals