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Home >> Buick >> 1987 >> Regal Base, 3.8 7 >> Repair and Diagnosis >> Engine Performance >> System >> Turbocharger >> Testing >> WASTEGATE/Boost Pressure Test >> 3.8L

WASTEGATE/Boost Pressure Test: 3.8L

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.
  1. Inspect wastegate-actuator hoses and mechanical linkage for damage. Attach Vacuum/Pressure Pump (J-23738) in series with Gauge (J-28474) to actuator assembly.
  2. Apply 13.5 psi (.95 kg/cm2 ) pressure to actuator assembly. The rod should move .015" (.38 mm), actuating the wastegate linkage. If not, replace the actuator.
  3. If a new actuator has been installed, crimp the threads of the actuator rod to maintain correct calibration. Remove test equipment and reconnect vacuum hoses.
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