GM Service Manual Online
For 1990-2009 cars only

Checks

Cause

Additionally, a popping noise similar to popcorn popping

Oil Pump System

    • Verify that the noise is internal to the oil pump during a preliminary oil pressure check. An increase in line pressure will vary an oil pump noise
    • Pump cavitation is indicated by bubbles on the fluid level indicator
    • Check the transmission fluid strainer for a filter seam leak
    • Check the transmission fluid strainer seal for proper positioning or for a cut seal