FixVault
Home › Chevrolet › 1991 › APV › Repair and Diagnosis › Engine Performance › Engine Controls - Adjustments › WASTEGATE Actuator Adjustment (Turbo)

WASTEGATE Actuator Adjustment (Turbo)

CAUTION: Improper wastegate actuator adjustment can severely limit performance or cause overboost, resulting in fuel shutoff.
  1. Remove passenger side wheelwell panel, retaining wire from actuator pin and boost control hose from wastegate actuator.
  2. Install Turbocharger Pressure Gauge (J-35691) to hose connection on wastegate actuator. Ensure dial reads zero.
  3. Install Dial Indicator (J-8001-3) on end of wastegate actuator lever. Ensure dial reads zero. Apply 4.5-5.0 psi (.31-.35 kg/cm2 ) air pressure to Pressure Gauge (J-35691). Check dial indicator.
  4. If dial indicator reads greater than 0.02-0.06" (0.5-1.5 mm), readjust rod by shortening it a half-turn at rod end. If dial indicator reads less than 0.02-0.06" (0.02-0.06 mm), readjust rod by lengthening it a half-turn at rod end.
  5. Recheck actuator travel at 4.5-5.0 psi (.31-.35 kg/cm2 ) air pressure. Repeat adjustment until specifications are met. Replace wastegate actuator if specifications cannot be met or if wastegate does not open at all.
About FixVault