GM Service Manual Online
For 1990-2009 cars only
  1. Remove the 3 oil pump cover screws and remove the oil pump cover.
  2. Remove the oil pump drive gear and the driven gear from the oil pump.

  3. Object Number: 236050  Size: SH

    Caution: Wear safety glasses in order to avoid eye damage.

  4. Apply light air pressure to the oil jet. Inspect the oil jet for damage or clogging.

  5. Object Number: 236052  Size: SH
  6. Remove and inspect the relief valve. Coat the relief valve with oil and check that it falls smoothly into the valve hole by its own weight.