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Home >> Buick >> 1989 >> Reatta >> Repair and Diagnosis >> Engine Performance >> System >> 3.3L/3.8L Component Tests >> Description >> Check At O2 Sensor >> Diagnosis

Check At O2 Sensor: Diagnosis

  1. Start engine and bring to operating temperature. Increase engine speed to 2500 RPM and note gauge. Reading should not exceed 1.25 psi (.09 kg/cm2 ).
  2. If specification is exceeded, exhaust system restriction is indicated. Check complete exhaust system for collapsed pipe, heat distress and possible internal muffler failure.
  3. If none of the conditions in step 2) exist, check for restricted catalytic converter. Replace if necessary.
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