Pictures of 425.... - Page 2
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500, 472, 425, 368 Discussion, Pictures of 425.... in Cadillac Engine Technical Discussion; Economy lamp. Runs on vacuum signal. Low vac, light comes on. See you at the gas station....
  1. #16
    The Ape Man's Avatar
    The Ape Man is offline Cadillac Owners Connoisseur
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    Re: Pictures of 425....

    Economy lamp. Runs on vacuum signal. Low vac, light comes on. See you at the gas station.

  2. #17
    bigblockcaddy is offline Cadillac Owners Member
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    Re: Pictures of 425....

    wait what does that mean,low vac from what?

  3. #18
    bigblockcaddy is offline Cadillac Owners Member
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    Re: Pictures of 425....

    if anyone that has a 77 78 or 79 caddy they do have this light and does anyone else have anymore ideas

  4. #19
    The Ape Man's Avatar
    The Ape Man is offline Cadillac Owners Connoisseur
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    Re: Pictures of 425....

    Low vac is normal when you step on the gas pedal with meaning,
    Low vac also happens with poor tune and medium throttle angle.

  5. #20
    bigblockcaddy is offline Cadillac Owners Member
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    Re: Pictures of 425....

    what would i need to get to fix it ?

  6. #21
    The Ape Man's Avatar
    The Ape Man is offline Cadillac Owners Connoisseur
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    Re: Pictures of 425....

    More throttle = less manifold vacuum. The light turns on when manifold vacuum drops below a set number. It is telling you that you would get better gas mileage if you didn't step on it enough to make the lamp come on. Think of it like having your wife in the passenger seat telling you to slow down. It's not an indication of any fault. The lamp will come on more if the engine tune isn't really good. Things like worn out ignition components and vacuum leaks will make the engine run with less vacuum.
    If you get reasonable performance and fuel economy with the car then nothing is wrong with it.

  7. #22
    bigblockcaddy is offline Cadillac Owners Member
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    Re: Pictures of 425....

    i have a like a half dollar size hole in my auto thermac hose ..would that have anything to do with it?

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