Question Regarding '85 Eldo TPS Fix???

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HT4100 4.1, 4.5, 4.9 Discussion, Question Regarding '85 Eldo TPS Fix??? in Cadillac Engine Discussion; I have an '85 Eldo with only 24k miles. Nice car and one of the only HT4100's I have ever ...
  1. #1
    tedasaurus is offline Cadillac Owners Fanatic
    Automobile(s): 1981 Fleetwood, 1994 Fleetwood
    Join Date
    Jul 2004
    Dallas, TX

    Question Regarding '85 Eldo TPS Fix???

    I have an '85 Eldo with only 24k miles. Nice car and one of the only HT4100's I have ever driven with a correctly working throttle and idle. Smooth and progressive with no delay. Unitl now. The car is acting like all other HT's. I presume it is the nototious TPS sensor since the idle is still good. No codes, but then again other HT's that had terrible throttle response never threw a code either.

    Where is the TPS sensor?

    Can you fix it, clean it?

    Should I just replace it?

    Any help is greatly appreciated.

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  3. #2
    Dave S Texas's Avatar
    Dave S Texas is offline Cadillac Owners Enthusiast
    Automobile(s): '87 Coupe DeVille 4.1L FWD(New engine '08) 1981 F100 '03FXDL
    Join Date
    May 2008
    Austin(area), Tx

    Re: Question Regarding '85 Eldo TPS Fix???

    The TPS is an electrical sensor(potentiometer) that measures the throttle-valve angle. It can be out of adjustment, Open, or Shorted. When Open or shorted it should set an E code(E22/E21). Before laying the blame on this piece verify there are no vacuum leaks at the throttle body/intake manifold/vacuum fittings/tees or hoses. Your description would lead me to first check the vacuum system.

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