85 eldo w/4100
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HT4100 4.1, 4.5, 4.9 Discussion, 85 eldo w/4100 in Cadillac Engine Technical Discussion; how do I set the tps on my 85 eldo with the 4100 in it...
  1. #1
    1copenhagen is offline Cadillac Owners Member
    Automobile(s): 1985 Eldorado Biarritz
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    85 eldo w/4100

    how do I set the tps on my 85 eldo with the 4100 in it

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  3. #2
    87SDeVille is offline Cadillac Owners Member
    Automobile(s): 1987 Sedan DeVille
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    Re: 85 eldo w/4100

    I am not sure if it is any different than my 87 DeVille 4100. But for my car what you do is get a voltmeter and with ignition turned on back probe the TPS sensor, put the red lead from VM to the signal wire on TPS sensor (should be the blue wire) put black lead from VM to a good ground. Typically you should have less than 0.5 Volts while the throttle is in idle position. If you have more voltage loosen the bolts and rotate the TPS until you achieve desired voltage. This assumes you have two bolts holding TPS to the throttle body and it is not pop rivetted to the TBI. Hope this helps.

  4. #3
    83CADMAN's Avatar
    83CADMAN is offline Cadillac Owners Fanatic
    Automobile(s): 83 Eldorado, 90 Seville, 94 Concours
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    Re: 85 eldo w/4100

    The 85 HT4100 has a green electrical connector coming from the wire harness on top of the engine near the alternator with nothing plugged into it. This is the test port for the TPS and has two pins. Simply insert the positive probe into the blue wire side and the ground into the other.
    Messing with the TPS can have an undesirable effect on the ISC adjustments requiring attention. Can be confusing and frustrating.
    Check out some of the post covering “ISC and TPS adjustments, and get a manual.

  5. #4
    1copenhagen is offline Cadillac Owners Member
    Automobile(s): 1985 Eldorado Biarritz
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    Thread Starter

    Re: 85 eldo w/4100

    thanks I will "get a manual" no green connector but a black one
    any one have a really nice air cleaner lid for 4100 or know where I can get the decal for it ?

    ya ebay 15.00 for a factory sevice manual

  6. #5
    ehall's Avatar
    ehall is offline Cadillac Owners Connoisseur
    Automobile(s): 1985 Sedan DeVille
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    Re: 85 eldo w/4100

    I think the lid is silk-screened

  7. #6
    1copenhagen is offline Cadillac Owners Member
    Automobile(s): 1985 Eldorado Biarritz
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    Thread Starter

    Re: 85 eldo w/4100

    well darn Ill have to keep looking thanks for the info

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