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Home >> Pontiac >> 2003 >> Vibe Base, AWD >> Repair and Diagnosis >> Engine Mechanical >> Engine Exhaust System >> Diagnostic Information and Procedures >> Restricted Exhaust >> Test Description

Test Description

The numbers below refer to the step numbers on the diagnostic table.

  1. The exhaust system has very low back pressure under normal conditions. If the exhaust system is restricted, a significant increase in the exhaust pressure is noticed on the J 35314-A  .
    1. Removing the AIR check valve or HO2S sensor may set a DTC. When finishing this diagnostic table, be sure to clear all codes.
  2. If high back pressure is not found at idle, increasing the engine speed may help find a restriction.
    1. Perform operational check before returning vehicle to customer.
  3. This step will isolate the catalytic converter from the remainder of the exhaust system.
  4. Confirming that the condition has been fixed is essential. If the symptom still exists and the vehicle has a dual exhaust system, proceed to Step 2 and repeat diagnostic procedure on the opposite exhaust pipe.
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