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Thread: LS1 Idle Issues

  1. #11
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    I just checked the DropBox, there are 5 tunes for 2002 Commodores there. I'm betting there's something behind the scenes that's causing these issues, I'd start with a bone stock, 2002 Commodore file and go from there. It wont give you the 12212156 OS, but 12225074 is a well supported OS as well. You can run COS3 with that OS and it is the proper base OS for your vehicle.

    I dont see the 12212156 OS being used on any Commodore per the DropBox, however that could be incorrect as I've never seen one in person.
    ~Erik~
    2013 Sonic RS Manual - 1.4L I4T E78, tuned, turbo mods, etc.
    2008 TrailBlazer SS 3SS AWD Summit White - LS2 E67/T42, bolt ons, suspension, etc.
    2002 Chevy TrailBlazer LT 4X4 Summit White - 4.2L I6 P10, lifted, wheels, etc.

  2. #12
    Joe (Moderator) joecar's Avatar
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    There is COS5 for these two GM OS's:
    - 12225074 Holden LS1 2002-4 -> upgrades to COS5 01290005
    - 12212156 Camaro/Firebird 2002 -> upgrades to COS5 02020005

  3. #13
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    There you go, use the 12225074 as the base OS and you should be set.
    ~Erik~
    2013 Sonic RS Manual - 1.4L I4T E78, tuned, turbo mods, etc.
    2008 TrailBlazer SS 3SS AWD Summit White - LS2 E67/T42, bolt ons, suspension, etc.
    2002 Chevy TrailBlazer LT 4X4 Summit White - 4.2L I6 P10, lifted, wheels, etc.

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