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Thread: TPS at 91% at WOT Good or Bad ???

  1. #1
    Join Date
    Jun 2002
    Location
    Pleasant Hill Ca. - across the bay from San Francisco.
    Posts
    280

    Question TPS at 91% at WOT Good or Bad ???

    Testing out new tool for OBD-II port. (Dennis can get them)
    One of the many sensor tests it does is cking. while driving is the TPS.
    At WOT my TPS only shows 91% open ---- should I not adjust to to 100%
    ie. 5volts ??? to get the most HP & TQ out of it at WOT ???
    At the stop sign it shows 17% to 19% ???

    Any Thoughts ???

    WarrenB

  2. #2
    TripleTransAm Guest
    From what I understand, the new Ford TPS does not emit a fixed voltage but some sort of a signal that represents the percentage of total signal range. I too get the similar (if not slightly higher - 21%?) reading at idle, but I can't remember the WOT value. Supposedly, the PCM considers anything past a certain % to be WOT, so you need to visually verify that a full pedal depression does translate to full-open-throttle.

    This new TPS is supposed to be much more reliable than the old fixed voltage TPS, according to what I heard (although I don't know how one can f*** up the old style, it's just a simple resistive wiper).

  3. #3
    Join Date
    Nov 2002
    Location
    Houston
    Age
    51
    Posts
    473
    TPS readings are normal. Your cars computer (EEC-V) reads 0-5volts returned through the TPS. Once inside the computer it's converted to a number in the form of Analog-To-Digital counts, say 0-4095.

    When you use a OBD-II data logger to see the TPS, they usually automatically read the counts and then peform a conversion to give you volts or % of max volts.


    The computer monitors the TPS for minimum voltage and uses this for its closed throttle reading. It starts using a new reading every time the power is cycled. Now as far as WOT, there's a preset value in addition to minimum measured. And WOT mode in the computer actually happens at a point lower than full open of the throttle blade.

    It is not necessary or desired to have closed throttle = 0 volts and WOT = 5 volts.
    Last edited by JohnE; 09-12-2004 at 06:52 AM.
    2003 Silver Marauder - Forged Iron Engine, Supercharged, SW Exhaust
    2002 White F250 7.3 - Turbo

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