Ford Explorer: Correct 95 Explorer PCM relearn procedure?
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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
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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...
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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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