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Home >> Chevrolet >> 1998 >> Tracker 2D Utility, 4WD, Standard >> Repair and Diagnosis >> Engine Performance >> System >> Engine Controls - Basic Engine Testing >> Preliminary Inspection & Adjustments >> Mechanical Inspection >> Exhaust System Backpressure

Exhaust System Backpressure

  1. Perform On-Board Diagnostic (OBD) System Check. See ON-BOARD DIAGNOSTIC (OBD) SYSTEM CHECK in TESTS W/CODES article. After performing OBD system check, go to next step.
  2. Remove HO2S (sensor 1). Install Exhaust Backpressure Tester (J-35314-A) in place of HO2S (sensor 1). After tester is installed, go to next step.
  3. Start engine. Observe pressure reading on tester with engine at idle. If 1.25 psi or less exists, go to next step. If greater than 1.25 psi exists, go to step 5).
  4. Increase engine speed to 2000 RPM and observe pressure reading on tester. If greater than 1.25 psi exists, go to next step. If 1.25 psi or less exists, go to step 7).
  5. Check entire exhaust system for collapsed pipe, heat distress or possible internal muffler failure. If problem does not exist, go to next step. If problem exists, repair as necessary and go to step 7).
  6. Replace catalytic converter and go to next step.
  7. Allow engine to idle until normal operating temperature is obtained. Check for DTCs. If DTCs do not exist, system is okay at this time. If DTCs exists, perform appropriate DTC test. See TESTS W/CODES article.
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