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What RPM does your 5.7 vortec idle at?

This is a discussion on What RPM does your 5.7 vortec idle at? within the Technical / Maintenance forums, part of the General Discussion category; I have a 98 GMC sierra 5.7 vortec. I am curious as to what other mechanically sound 5.7s idle at ...

  1. #1
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    What RPM does your 5.7 vortec idle at?


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    I have a 98 GMC sierra 5.7 vortec. I am curious as to what other mechanically sound 5.7s idle at becuase I think mine idles to high for some reason. It idles at about 700 when warm. My dads truck idles at about 500 and seems to run a lot better. I would think that all mechanically sound 5.7 vortecs would have the same idle speeds if everything is stock on them...right?

    Kyle

  2. #2
    Registered User Mn02Sierra's Avatar
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    mine idles at about 600 when warm

  3. #3
    Original Gold Member SLMDLT1's Avatar
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    650-700 was the 5.7, the other 96 5.0 idles at around 550.
    2003 GMC Sierra ECSB Z71...6-7.5" Superlift, 20" Eagle 064s on 37x13.50x20 Kumho MT's, Predator, etc.
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    650 when warm

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    95 tbi 500 when warm 700 when its cold buds 98 very same

  6. #6
    Trucknut Sambo's Avatar
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    My old truck 95 with 4.3 idles at 500 and my 96 with 350 idles at about 700 so it sounds about normal to me.
    Sam
    2006 K1500 Vortec Max CCSB 6.0 4.10's, Nelson SD Tune, Trick Turbo kit T76 @ 8psi, 60lb/hr injectors, 4" duramax exhaust, snowmeth stage 2 kit, FLT Level 5 4L70E, Vig 2600, 40K trans cooler. 13.2 @ 100.5mph 1.8 60ft

  7. #7
    formerly rcfast
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    550-600 warm 800 cold

    98 silverado....Built 383
    Trying to do thing's a l31 "could never do"

  8. #8
    Original Gold Member 97Silverado's Avatar
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    My 5.0L idles right around 600


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    500

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    Home of the Snooki punch! CKTA's Avatar
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    Between 6 and 7 depending on temp.
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  11. #11
    Registered User kAdUkUbOy's Avatar
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    between 600 and 700.....

 

 

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