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Home >> Audi >> 1984 >> 5000 4D Sedan, 2.2 C >> Repair and Diagnosis >> Engine Performance >> System >> Turbocharger - Gasoline >> Testing >> Boost Pressure

Boost Pressure

  1. To test the turbocharging system, use a pressure gauge (VW 1397). The gauge is equipped with a valve which locks pressure measurement when closed.
  2. Attach gauge to vacuum advance at distributor, using "T" fitting supplied with gauge. Ensure vacuum advance unit and charcoal canister purge valve are free of leaks. Use hose clamps at all connections to avoid low readings.
  3. Boost pressure can only be tested on a chassis dynamometer or through road testing. Route length of hose and gauge into passenger compartment. Warm engine until oil temperature is above 176°F (80°C).
  4. Accelerate engine to 4000 RPM in second gear. Hold vehicle speed constant and close gauge shut-off valve. Record reading.
    NOTE: Testing should not exceed 10 seconds at full boost.
  5. Boost pressure readings will vary with temperature. compare results with readings in BOOST PRESSURE SPECIFICATIONS table.
  6. If boost pressure is not okay, replace wastegate as testing measure and retest. If boost pressure is still not okay replace defective turbocharger.
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