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high idle after long tube install

This is a discussion on high idle after long tube install within the General Help forums, part of the LSx Technical Help Section category; Hey all, i recently put longtubes on my car and i noticed that whenever i take the car out of ...

  1. #1
    Senior Member Ramairgod84's Avatar
    Join Date
    Aug 2008
    peoria, az

    2001 WS6

    high idle after long tube install

    Hey all, i recently put longtubes on my car and i noticed that whenever i take the car out of gear, with the clutch pushed in, if i just let the car coast down the road, it'll idle high at around 1500 rpm. if i let the clutch out, it'll go down, or if im at a stop it'll kick down. Has anyone else experienced this?

  2. #2
    Member Fearls1's Avatar
    Join Date
    Oct 2005
    Verdigris, OK

    2002 T/A M6

    Mine does that too. I'm pretty sure that its the speed sensor that is making sure your won't put it in a low gear with idle range rpm. Not 100% tho.
    3" MagnaFlow CatBack w/Corsa (clone)Tips, Lloyds Custom Floor Mats, SLP Lid, Pro 5.0 W/ Lou's SS, 7.5" Eaton Locker w/3.73, KYB AGX, BMR LCA's, FRA, SSE, 5% Tint, 18x9 C5 Rims w/Falken 452

  3. #3
    Veteran 0rion's Avatar
    Join Date
    Aug 2005

    98 Formula
    06 duramax

    check for vacuum leaks or any unmetered air entering post maf first. Are headers your only mod?

  4. #4
    🤔 11s. blackbirdbrain89's Avatar
    Join Date
    Sep 2007
    hagerstown, mercersburg

    black trans am

    no its called throttle cracker.... u have to have it uve always had it just never noitced it so if ur bogging the car @ lets say 3rd at 25 mph and ur at 1000 rpm when u push the clutch in it wont shut off,, when ur bogging it it trying to make it idle there fore closing the IAC valve so when u press the clutch in u killed all the air and will come close to killing the eng...., ive tried to remove it so i can show off the cam but, if i do it stalls all the time and kinda sucks

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