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Poor vaccuum?

Discussion in 'The Garage' started by txbartman, Jun 10, 2002.

  1. txbartman

    txbartman 1/2 ton status

    Jun 1, 2001
    Likes Received:
    Plano, TX
    On a trip this weekend, I really noticed that I seem to have poor vaccuum. The way i noticed was that it didn't take much getting on the throttle before my a/c switched to the floor vents from the dash. I know this switched is vaccuum controlled, hence poor vaccuum.

    I recently swapped in a 350 for the original 305. It has a fairly beefy extreme 4x4 cam in it. Do I have a problem? Or is this to be expected? How would I go about checking for sure? /forums/images/icons/confused.gif
  2. tRustyK5

    tRustyK5 Big meanie Staff Member Super Moderator GMOTM Winner Author

    Jul 23, 2000
    Likes Received:
    E-town baby!
    IIRC there is some sort of accumulator on the firewall. I'd check for a leak or bad hose there. I've also had the little hoses come of the little vacuum manifold under the dash too. I doubt it is motor related because any motor goes to low vacuum under throttle. If you have a reasonable idle you have decent enough vacuum to run your accessories.


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