GM Service Manual Online
For 1990-2009 cars only

Component

Inspect

Oil Pump Assembly

    • Stuck pressure regulator valve
    • Sticking pump slide

Valve Body Assembly

Spacer plate or gaskets are incorrect, incorrectly assembled or damaged

Case

    • Porous or damaged valve body pad
    • 2-4 servo assembly
    • 2-4 accumulator porosity
    • Damaged servo piston seals
    • Apply pin damaged or improper length
    • 2-4 band assembly
    • Burned
    • Anchor pin not engaged

Throttle Position Sensor

    • Disconnected
    • Damage

Vehicle Speed Sensor

    • Disconnected
    • Damaged
    • Bolt not tightened