GM Service Manual Online
For 1990-2009 cars only

Tools Required

J 23738-A Hand Operated Vacuum Pump


Object Number: 177102  Size: SH

The wastegate actuator assembly can be replaced separately from the turbocharger assembly. Use the following procedure to check the operation of the wastegate actuator:

  1. Turn the engine off.
  2. Inspect the actuator rod and lever. The actuator rod and lever should move back and forth without any tension.
  3. Apply 5 inches HG vacuum to the actuator. The actuator rod and lever should close the wastegate.

  4. Look for the rod to move toward the front of the engine.

Object Number: 177090  Size: SH

With the engine running, the actuator rod should snap back to a closed position. If not, the wastegate actuator is defective and should be replaced. For removal of the wastegate actuator, refer to Wastegate Actuator .