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Home >> Pontiac >> 1989 >> Sunbird LE, 2D Coupe, Automatic >> Repair and Diagnosis >> Engine Performance >> System >> 2.0L Turbo Tests W/Codes >> Chart B-1, Restricted Exhaust System Check

Chart B-1, Restricted Exhaust System Check

  1. With engine at operating temperature, connect a vacuum gauge to any convenient vacuum port on intake manifold. Increase engine speed to 1000 RPM and record vacuum reading.
  2. Increase engine speed slowly to 2500 RPM. Note vacuum reading at steady RPM.
  3. If vacuum at 2500 RPM decreases more than 3 in. Hg from reading at 1000 RPM, check complete exhaust system for collapsed pipe, heat distress and possible internal muffler failure.
  4. If no faults are visible in exhaust system, remove exhaust pipe from engine and repeat steps 1) and 2). If vacuum still drops more than 3 in. Hg, check valve timing.
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