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Home >> Pontiac >> 1985 >> Sunbird S, Automatic >> Repair and Diagnosis >> Engine Performance >> System >> Turbocharger >> Testing >> WASTEGATE/Boost Pressure Test >> 1.8L

WASTEGATE/Boost Pressure Test: 1.8L

  1. Inspect wastegate and actuator assembly for linkage damage. Check condition of hose from throttle body to wastegate solenoid and from wastegate solenoid to actuator, then remove hose.
  2. Connect a hand operated Vacuum/Pressure Pump (J-23738) in series with component Gauge (J-28474) to actuator assembly hose.
  3. With 4 psi (.28 kg/cm2 ) pressure applied to actuator, rod should move .015" (.38 mm). Replace actuator if not operating properly. Check new unit and crimp threads on rod to maintain proper calibration.
  4. Remove test equipment. Reconnect actuator to wastegate solenoid hose.
NOTE: Either road test or shop test may be used to check wastegate operation on 3.8L engines. It is not necessary to perform both tests.
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