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Ford Explorer: Correct 95 Explorer PCM relearn procedure?

  1. #1
    JP
    Guest

    Correct 95 Explorer PCM relearn procedure?

    95 Explorer XLT 153000 miles 4.0 OHV V6.

    After replacing the IAC valve to correct an idle problem on my sons '95
    Explorer I cleared the KAM and took the PCM through a relearn procedure.
    I used a procedure I found at an Australian website that looked pretty
    good (tho it was for the V8 not the V6).

    http://lightning.prohosting.com/~v8mate/auiac3.html

    I got a Chiltons manual today and the relearn procedure in it consists
    of nothing more than a 10 mile drive. Seems pretty basic if you ask me.
    I've seen other procedures on the net and here.

    Is there a definitive relearn procedure? Does it vary by model/year? Do
    OBD-I or OBD-II engines differ in relearn procedure? I'm new to this
    stuff so any sage advice is welcome.

    Thanks


    BTW

    The good news is the car idles better (hasn't cut out in 2 days). Oddly
    enough both my son and I independently came to the conclusion that
    performance is much better with better pickup on the highway. Can this
    improved performance be attributed to a new IAC valve or the PCM relearn
    process?

    A few days prior to IAC valve replacement the engine had new plugs,
    wires, fuel filter and a throttle body cleaning. This didn't help the
    problem and I decided to troubleshoot myself if all the local shop was
    going to do is guess. (I can do that at a better labor rate). Thanks to
    this newsgroup it looks as if I may have guessed right first time (time
    will tell if the problem returns or not). I plan to get a code scanner
    to try and eliminate some of the guesswork in the future.

    JP


  2. #2
    Jim
    Guest

    Re: Correct 95 Explorer PCM relearn procedure?

    The PCM relearn procedure is nothing more than allowing the processot to
    "learn' the inputs and outputs of the vehicle. After a KAM reset, we don't
    do anything special other than to warn the customer that the car may run
    (comparatively) poorly for a day or two. None of our customers need to pay
    door rate for something the car does quite well on it's own.

    All of the operating parameters are stored in the ROM and all the car needs
    is the chance to fine tune it's program to any variations in sensor voltages
    and such. I might add that we need to drive the car long enough for it to
    enter closed loop operation - this can take several miles on older vehicles.
    Newer vehicles (in good running order) enter closed loop much quicker than
    older technology.

    You may be thinling of the idle relearn procedure..... something that Ford
    thought up for OBD1 vehicles..... I can't recall using this more than a
    couple of times in an effort to cure the rolling idle that many old 302s
    used to "feature".


    --
    Jim Warman
    net

    "JP White" <net> wrote in message
    news:fMEqb.53818$bellsouth.net... 



  3. #3
    JP
    Guest

    Re: Correct 95 Explorer PCM relearn procedure?

    Jim Warman wrote: 

    Thanks for that explanation Jim. The procedure I followed may well have
    been the idle relearn procedure, it had you spend 8 minutes at idle
    with the vehicle in drive or neutral and with the a/c on or off, then it
    had you do a test drive. The website I quoted dealt with replacing the
    IAC so the procedure could well be biased towards calibrating the idle.
    My sons vehicle is ODB-I and would cutout occasionally approaching stop
    lights or in heavy traffic, so I may have inadvertently stumbled across
    the best procedure for the task at hand. I'd rather be lucky than good.

    JP



 

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