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Thread: Choke Pull-off

  1. #1
    Join Date
    May 2003
    Location
    Near Quebec City,Canada
    Posts
    1,449

    Default Choke Pull-off

    I just rebuild (with succes) my 2GV carburetor and my mechanic told me that the choke pull-off need to be replaced .

    Can someone explain what's the function ans how it looks like (w/pics if possible)

    Thank you
    Donald

    actual Buick:
    1968 Skylark Custom 44437 - 350-2 (L30) 230Hp 350lb/ft
    1998 Century Limited - 3.1L (L82) 160Hp 185lb/ft
    past Buick:
    1995 Regal Custom - 3.1L (L82) 160Hp 180lb/ft
    2004 Century Custom - 3.1L (LG8) 175Hp 195lb/ft

    Sky.....lark is the limit ! 68/69 STEPCHILD NATION
    Amateursdebeauxchars.com

  2. #2
    Join Date
    Feb 2002
    Location
    Oakland Gardens, N.Y.
    Posts
    21,878

    Default Re: Choke Pull-off

    Quote Originally Posted by 68 Skylark cust View Post
    I just rebuild (with succes) my 2GV carburetor and my mechanic told me that the choke pull-off need to be replaced .

    Can someone explain what's the function ans how it looks like (w/pics if possible)

    Thank you
    The choke pull off is a vacuum diaphragm that opens the choke blade against thermostatic spring tension so that the engine runs smoothly during warm up without loading up. Below is a picture of the typical choke pull off, and the one on your 2bbl.

    It is easy to see if it is working correctly by looking at it with the engine running. The vacuum will pull the link in if it is working.
    Attached Images Attached Images
    Last edited by LARRY70GS; 06-12-2011 at 11:57 AM.
    Larry
    1998 "Fully Optioned" SC3800 Riviera
    70 GS 455 Stage1, TSP 470, 602 HP@ 5900, 589 TQ @ 4900
    TA Hyd Roller Cam, 230*/238*, 112, .544"/.577" lift, 4-7 swap
    MSD Digital 6+, Ignitionman Distributor w/MSD trigger
    1967 BT Switchpitch ST-400, Gear Vendors OD
    with TSP 3200/1800 converter
    AED 1000 HO Carb, 800 CFM 7042240 Quadrajet
    8.5 10 bolt, 3.73's
    Best E.T. 11.54@ 115.00. Best MPH, 11.58@ 115.89
    Larrymta@verizon.net, GSCA #291
    BPG # 1063
    N.E. GS/GN Club Assistant Director

  3. #3
    Join Date
    May 2003
    Location
    Near Quebec City,Canada
    Posts
    1,449

    Default Re: Choke Pull-off

    Thank you Larry , I was not familliar with this term in english .

    So , this "rod" (red arrow) has to move in order to pull the link . My old one has to be stuck ? In other word what make them stop working ?

    actual picture of my carb :
    Donald

    actual Buick:
    1968 Skylark Custom 44437 - 350-2 (L30) 230Hp 350lb/ft
    1998 Century Limited - 3.1L (L82) 160Hp 185lb/ft
    past Buick:
    1995 Regal Custom - 3.1L (L82) 160Hp 180lb/ft
    2004 Century Custom - 3.1L (LG8) 175Hp 195lb/ft

    Sky.....lark is the limit ! 68/69 STEPCHILD NATION
    Amateursdebeauxchars.com

  4. #4
    Join Date
    May 2011
    Location
    Central PA.
    Posts
    553

    Default Re: Choke Pull-off

    It is vacuum operated with an internal diaphram made of rubber. The plastic on the housings get old and may crack and/or the rubber diaphram tears and the vacuum put to the pull-off will no longer move the diaphram due to a vacuum leak.

    If you have access to a vacuum tool (like the 'MityVac' one man brake bleeder type) you can test any of these pull-offs by exerting a small amount of vacuum to see if the diaphram pulls in. It should also pull in and stay in if there are no leaks.

    Hope this helps.

  5. #5
    Join Date
    Feb 2002
    Location
    Oakland Gardens, N.Y.
    Posts
    21,878

    Default Re: Choke Pull-off

    You can also unhook the vacuum hose, then push the link in by hand, cover the vacuum connection on the pull off with your finger, and the link should not move until you remove your finger.
    Larry
    1998 "Fully Optioned" SC3800 Riviera
    70 GS 455 Stage1, TSP 470, 602 HP@ 5900, 589 TQ @ 4900
    TA Hyd Roller Cam, 230*/238*, 112, .544"/.577" lift, 4-7 swap
    MSD Digital 6+, Ignitionman Distributor w/MSD trigger
    1967 BT Switchpitch ST-400, Gear Vendors OD
    with TSP 3200/1800 converter
    AED 1000 HO Carb, 800 CFM 7042240 Quadrajet
    8.5 10 bolt, 3.73's
    Best E.T. 11.54@ 115.00. Best MPH, 11.58@ 115.89
    Larrymta@verizon.net, GSCA #291
    BPG # 1063
    N.E. GS/GN Club Assistant Director

 

 

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