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Highway idle

This is a discussion on Highway idle within the General Help forums, part of the LSx Technical Help Section category; While driving down the highway, if i put my car in neutral it will sometimes idle high (1200 or so ...

  1. #1
    Junior Member
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    Highway idle

    While driving down the highway, if i put my car in neutral it will sometimes idle high (1200 or so rpm) Other times it will bounce 1000-1500. But if i come to a stop after about 2 seconds the idle returns to normal (700-800).
    WTF is wrong with it?

    M6-ls1

  2. #2
    Slow'er'Ass Mr. Luos's Avatar
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    Red Tint Jewelcoat
    2008 Trailblazer SS

    Quote Originally Posted by Nater36 View Post
    WTF is wrong with it?
    Nothing.


    More air coming in at speeds. Idle is set up to idle....at 0 MPH.

  3. #3
    Moderator Cutlass's Avatar
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    1999 Formula WS6 M6-sold
    2001 Silverado Z71

    I disagree. Mine doesn't do that. Refer to this thread:
    high idle only when moving

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