83 eldorado accessory ticking, stumped
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Cadillac Seville / Cadillac Eldorado Forum Discussion, 83 eldorado accessory ticking, stumped in Past Cadillac Vehicle Discussion; Hi all new here, Ive got an eldorado with a 4.1. I replaced a valve cover last week and in ...
  1. #1
    jhowson1108 is offline Cadillac Owners Member
    Automobile(s): 1983 eldorado 4.1
    Join Date
    Dec 2013
    Age
    22
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    83 eldorado accessory ticking, stumped

    Hi all new here, Ive got an eldorado with a 4.1. I replaced a valve cover last week and in the process i removed the outlet hose on the vacuum pump. After completing the repair i started the car and a very loud, rpm dependent tick was noticable. It is coming from the vacuum pump. If i remove the vacuum pumps belt or plug the intake hose to the pump the sound goes away. But ive already replaced the vacuum pump twice and still the same ticking. Any ideas? Or experience?

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  3. #2
    carnut is offline Cadillac Owners Master
    Automobile(s): 1988 Allante' (sold), 1984 Eldorado, 84 Sedan DeVille
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    Feb 2003
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    california
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    67
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    Re: 83 eldorado accessory ticking, stumped

    Replaced twice? by that do you mean new ones? My 84 sedan had that same noise at mid throttle RPM in park when I bought it. I replaced the pump with a new one and the noise quit.

  4. #3
    jhowson1108 is offline Cadillac Owners Member
    Automobile(s): 1983 eldorado 4.1
    Join Date
    Dec 2013
    Age
    22
    Posts
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    Thread Starter

    Re: 83 eldorado accessory ticking, stumped

    yea, i replaced it with a parts store new one then a rebuilt one offline and no change between all 3

  5. #4
    carnut is offline Cadillac Owners Master
    Automobile(s): 1988 Allante' (sold), 1984 Eldorado, 84 Sedan DeVille
    Join Date
    Feb 2003
    Location
    california
    Age
    67
    Posts
    5,997

    Re: 83 eldorado accessory ticking, stumped

    A shot in the dark, but the vacuum pump hose goes to a metal manifold above the driver exhaust manifold. Are there any hoses split or disconnected there? Maybe with a hose off the pump has less internal pressure and might knock.

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