4.5 Computer Tachometer

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HT4100 4.1, 4.5, 4.9 Discussion, 4.5 Computer Tachometer in Cadillac Engine Technical Discussion; I saw a thread about this a long time ago, and it told how to look up the tachometer on ...
  1. #1
    twitt11's Avatar
    twitt11 is offline Cadillac Owners Member
    Automobile(s): 2008 STS-V
    Join Date
    Jan 2006

    4.5 Computer Tachometer

    I saw a thread about this a long time ago, and it told how to look up the tachometer on the computer of my 88 Deville. I think I figured it out, though, but am not sure if I am looking under the right code. I think it is listed under P.0.8. Does anyone know if that is the correct code for the tachometer? Thanks.

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  3. #2
    carnut is offline Cadillac Owners Master
    Automobile(s): 1988 Allante' (sold), 1984 Eldorado, 84 Sedan DeVille
    Join Date
    Feb 2003

    Re: 4.5 Computer Tachometer

    The tach once displayed, is a 3 digit number. On my Eldo its parameter is 11 not 8. Mine maxes out at 199, in other words 1999 RPM. The tach is useful to verify torque converter lock up and correct idle speed. Once the car is turned off, you have to re enter diagnostics.

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