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  • #1

    Vacuum Pressure

    I have looked all over and have not found anything.


    What is the correct idle vacuum pressure on the 3.4l
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  • #2
    Re: Vacuum Pressure

    im confused by your post, what are you looking for?

    vacuum from the intake?

    fuel pressure?

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    • #3
      Re: Vacuum Pressure

      Vac. should be about -18 to -22 at idle and around -10 while crusing, unless you have a big cam then you might see -12 or -14, I have a mild cam and it dropped mine to -16 to -18 but runs smoothly. WOT of course is going to be 0.
      08' L76 6.0L 4X4 Chevy EXT.Cab LTZ Vortec MAX with Snug top cover, Dynomax exhaust,Hptuners& K&N intake
      96' Camaro M5 to A4 conversion, alot of mods . GT35R Turbo full suspension. Built engine

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