GM B-Body Forum, 77-79 Caprice/Impala Forum

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GM B-Body Forum, 77-79 Caprice/Impala Forum

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GM B-Body Forum, 77-79 Caprice/Impala Forum

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GM B-Body Forum, 77-79 Caprice/Impala Forum

A forum for the owners and enthusiasts of General Motors B-Bodies from 1977-1990, but dedicated to the owners of 1977-1979 Impalas and Caprices. Join up now!


3 posters

    vacuum advance

    scy135
    scy135
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    vacuum advance Empty vacuum advance

    Post  scy135 Fri May 22, 2015 12:58 am

    I noticed my 78 caprice 350 has a distributor with vacuum advance but I cant find the hose the goes to it. My question is is my car supposed to have vacuum advance if so where does it hook up to
    HeavyChevy77
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    Post  HeavyChevy77 Sun May 24, 2015 4:59 pm

    Check the" why is my car hard to start when cold" thread in the questions/problems section I posted a vacuum diagram pic
    Here's the links to how mine are plumbed
    https://i.servimg.com/u/f59/18/98/28/33/image14.jpg
    https://i.servimg.com/u/f59/18/98/28/33/image16.jpg
    https://i.servimg.com/u/f59/18/98/28/33/image17.jpg
    https://i.servimg.com/u/f59/18/98/28/33/image18.jpg
    scy135
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    Post  scy135 Sun May 24, 2015 7:30 pm

    I looked around my carb and I found a small hose fitting tucked in the back it appears to be the same size so I'm gonna buy some hose. Hopefully that will help my car accelerate
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    vacuum advance Empty Re: vacuum advance

    Post  GM B-Body Forum Mon May 25, 2015 8:59 am

    is yours completely stock? But yes there is a hose, and if you have the original quadrajet carb theres a small vac port off the front right side if your facing the carb, theres alot of vacuum ports coming off of them, but this one has a check valve, it will be round with 4 vac lines going to it, the front hose on that check valve goes all the way to the vac advance
    scy135
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    Post  scy135 Mon May 25, 2015 4:08 pm

    Yea my car is all stock ohh ok I guess someone messed with my vacuum lines prior because they're all taken up except for the one in the back
    HeavyChevy77
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    Post  HeavyChevy77 Mon May 25, 2015 4:29 pm

    scy135 wrote:Yea my car is all stock ohh ok I guess someone messed with my vacuum lines prior because they're all taken up except for the one in the back
    That back one is for the air cleaner or should be ..compare ur hose plumbing to mine in the other pics I sent
    Here's a vac diagram for high altitude 77 sbc 350
    https://i.servimg.com/u/f59/18/98/28/33/image10.jpg

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