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Thread: Vacuum at idle

  1. #1
    VXR enough R34nel's Avatar
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    Default Vacuum at idle

    Can someone with a boost guage tell me what vacuum your car shows at idle, with the air con off.

    Iím fixing a brake servo leak and this is the only way I can be sure itís fixed, I just donít know what the vac should be.

    Thanks
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  2. #2
    VXR enough andrewt1971's Avatar
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    Just pop the brake servo pipe off the manifold and get a helper to block the nipple with a finger and see if your reading changed, eliminates any inaccuracies in different gauges.

  3. #3
    VXR enough R34nel's Avatar
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    Yeah good idea thanks
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  4. #4
    VXR enough R34nel's Avatar
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    I tried this and it sits at -10
    I had read someone saying it should be higher than that so can someone let me know what’s theirs shows approx?

    Just want to confirm that there are no other leaks
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  5. #5
    VXR Adam"san" w20adm's Avatar
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    It should hover right around -20 mate

    Whenever mine has said higher I had a boost pipe popped off
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  6. #6
    VXR enough R34nel's Avatar
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    -20 you sure?
    even going down hill on a low gear I don’t see any lower than -14.

    It is unchanged from before I fitted the cooler, so I’m confident a pipe hasn’t come off because I’ve changed it all and it reads the same
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  7. #7
    VXR enough R34nel's Avatar
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    Is that psi that yours reads?
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  8. #8
    VXR Adam"san" w20adm's Avatar
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    Yes mate. And yes -20 psi.
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  9. #9
    VXR enough R34nel's Avatar
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    That’s bizzare, I’d expect a leak so big to cause it to idle like crap but it doesn’t, if I take off a vac hose it goes really lumpy like it will stall.

    can someone else looks what theirs reads to confirm?
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  10. #10
    VXR Adam"san" w20adm's Avatar
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    Mine when letting off throttle will shoot right down to below -25ish. Always has done. And sits at -20. Like I've said, the 1 or 2 times it hovered at -10 I had a boost leak from somewhere.
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