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Thread: 90mm TB idling at 3000rpm

  1. #1
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    Default 90mm TB idling at 3000rpm

    Ok trying to help a mate tune his car, it has a 226 234 113 cam and have just put a 90mm Pro Comp throttle body and TPIS 90mm lS6 manifold.

    I cannot stop the thing from spiting the IAC valve out of its housing (It comes all the way out where we have to remove it and put it back together then reinstall. It also upon firing idles at 3000rpm and will not settle. Please find attached a log and the tune. I have tried many different things to stop it but can't seem to make it idle normally.

    Jason COS5 Speed Density 2003 model ls1 manual_0012.tunJason 90mm throttle idle.efi

  2. #2
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    sounds a mechanical issue with the TB
    Regards,

    Odd Boy

  3. #3
    Lifetime Member johnv's Avatar
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    Or manifold not seated properly, or maybe a vacumme or breather hose problem.

    usually cammed cars struggle to get enough air at idle, sounds like you have way to much. is the throttle blade cracked open to much when on the throttle stop ?
    is TPS reading zerrow when throttle is closed, may need TPS reset.
    Back yard boost
    347+ T76 = 770 rwhp 10.96 @ 135 mph

  4. #4
    Junior Member SirNemesis's Avatar
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    If the IAC is spitting the needle, perhaps it is the wrong IAC? It shouldn't do that as the throttle body should physically stop it.

  5. #5
    Lifetime Member 5.7ute's Avatar
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    Sounds like a manufacturing error in the TB to me. Measure the distance from the IAC valve mounting face to the seat in both TB's to confirm.
    The Tremor at AIR

  6. #6
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    All sorted guys, was a problem with the blade and the IAC.

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