GM Service Manual Online
For 1990-2009 cars only

Removal Procedure

  1. Remove the fuel injector sight shield. Refer to Intake Manifold Cover Replacement .

  2. Object Number: 688427  Size: SH
  3. Disconnect the vacuum hose (2) and vacuum brake booster check valve (4) from vacuum brake booster.
  4. Disconnect the vacuum hose (2) from the intake manifold (1).

  5. Object Number: 688567  Size: SH
  6. Remove the vacuum brake booster check valve (4) from the vacuum brake booster hose (2).

Installation Procedure


    Object Number: 688427  Size: SH
  1. Connect the vacuum hose (2) to the intake manifold (1).

  2. Object Number: 688567  Size: SH
  3. Install the vacuum brake booster check valve (4) to the vacuum brake booster hose (1).
  4. Connect the vacuum hose (2) and vacuum brake booster check valve to vacuum brake booster.
  5. Install the fuel injector sight shield. Refer to Intake Manifold Cover Replacement .