think these are the same parts?
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HT4100 4.1, 4.5, 4.9 Discussion, think these are the same parts? in Cadillac Engine Technical Discussion; I need to get a new ISC for my '85 DeVille 4.1 and can't find AC Delco part. However they ...
  1. #1
    ehall's Avatar
    ehall is offline Cadillac Owners Connoisseur
    Automobile(s): 1985 Sedan DeVille
    Join Date
    Aug 2007
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    Southern Maryland
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    think these are the same parts?

    I need to get a new ISC for my '85 DeVille 4.1 and can't find AC Delco part. However they do show an IAC that looks like it includes the whole ISC setup.

    AC Delco IAC D6577 -- $119.89



    Standard Motor ISC SA4 -- $109.89



    looks like the same kit to me... maybe AC Delco is a little ??

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  3. #2
    jbleinweber is offline Cadillac Owners Member
    Automobile(s): 1992 Seville
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    Oct 2006
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    Garnett, Kansas
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    Re: think these are the same parts?

    If a qualified opinion is what you are looking for, don't count your chickens before they cross the road.

  4. #3
    carnut is online now Cadillac Owners Master
    Automobile(s): 1988 Allante' (sold), 1984 Eldorado, 84 Sedan DeVille
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    Re: think these are the same parts?

    Thats the correct part. Listing it as an IAC rather than ISC is probably a catalog error. I've owned many Cadillacs that use this part and have yet to replace one. Almost every car I get, someone has monkeyed around with the adjustment. Just got a 91 Allante and it uses the same ISC as your 85. Someone had shimmed the ISC away from its bracket to lower the idle. I retracted it by the book, then adjusted the minimum idle to spec then found it necc to screw in the pintle two full turns to get the proper gap. I've even taken one apart and cleaned it. Rather a simple switch when apart.

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