GM Service Manual Online
For 1990-2009 cars only

The purpose of New Product Information is to highlight or indicate important product changes from the previous model year.

Changes may include one or more of the following items:

    • Torque values and/or fastener tightening strategies
    • Changed engine specifications
    • New sealants and/or adhesives
    • Disassembly and assembly procedure revisions
    • Engine mechanical diagnostic procedure revisions
    • New special tools required
    • A component comparison from the previous year

Torque Values and/or Fastener Tightening Strategies

    • All fasteners and threaded holes on the engine utilize metric threads.
    • All M11 cylinder head bolts are the same length and have a common torque/angle tightening strategy.

Changed Engine Specifications

Piston pin specifications have been revised.

Disassembly and Assembly Procedure Revisions

    • The piston and pin are to be serviced as an assembly.
    • All applications use full-floating design piston pins.

Engine Mechanical Diagnostic Procedure Revisions

All diagnosis on a vehicle should follow a logical process. Strategy based diagnostics is a uniform approach for repairing all systems. The diagnostic flow may always be used in order to resolve a system problem. The diagnostic flow is the place to start when repairs are necessary. For a detailed explanation, refer to Diagnostic Starting Point - Engine Mechanical .

New Special Tools Required

A variety of new tools have been developed to assist in engine disassembly, assembly and on-vehicle service. Refer to Special Tools .

A Component Comparison from the Previous Year

    • All M11 cylinder head bolts are the same length.
    • All applications use full-floating design piston pins.