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Vacume

Discussion in 'Intermediate CJ-5/6/7/8' started by T Todd, Aug 5, 2006.

  1. Aug 5, 2006
    T Todd

    T Todd Mostly Confused

    Frazeysburg Ohio
    Joined:
    Jan 14, 2005
    Messages:
    111
    Why can I open the vacume line to the distributor without effecting the idle speed? If I open an unused line on the intake the idle will increase.
    This is a 304.
     
    T Todd, Aug 5, 2006
    #1
  2. Aug 5, 2006
    timgr

    timgr We stand on the shoulders of giants. 2022 Sponsor

    Medford Mass USA
    Joined:
    Aug 10, 2003
    Messages:
    23,596
    The throttle butterfly closes off the carburetor vacuum tap (ported vacuum) at idle.
     
    timgr, Aug 5, 2006
    #2
  3. Aug 5, 2006
    T Todd

    T Todd Mostly Confused

    Frazeysburg Ohio
    Joined:
    Jan 14, 2005
    Messages:
    111
    Thanks. The reason I'm checking is I have a big dead spot in the throttle just off idle. Once the rpm's come up it pulls very well.
     
    T Todd, Aug 5, 2006
    #3
  4. Aug 5, 2006
    Chuck

    Chuck Sponsor

    Southshore Ma
    Joined:
    Sep 19, 2004
    Messages:
    1,463
    Can you borrow a vacuum gauge from someone? If it will hold vacuum it’s good.
     
    Chuck, Aug 5, 2006
    #4
  5. Aug 7, 2006
    MA74CJ5

    MA74CJ5 Member

    Bolton, MA
    Joined:
    Oct 28, 2004
    Messages:
    482
    Maybe the accel pump in the carb?
     
    MA74CJ5, Aug 7, 2006
    #5
  6. Aug 7, 2006
    timgr

    timgr We stand on the shoulders of giants. 2022 Sponsor

    Medford Mass USA
    Joined:
    Aug 10, 2003
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    23,596
    The usual problem with 2100s is the power valve. You can replace it without rebuilding the carb, but the carb has to come off the manifold. Don't be shocked if your rebuild kit is $50+ ... the 2-stage power valve adds about $25 to the price of the kit.
     
    timgr, Aug 7, 2006
    #6
  7. Aug 7, 2006
    Chuck

    Chuck Sponsor

    Southshore Ma
    Joined:
    Sep 19, 2004
    Messages:
    1,463
    Yup, bought one two days ago $43 AutoZone
     
    Chuck, Aug 7, 2006
    #7
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