It's a little more complex than just caring if the sensors are within a
specific range - especially on newer PCM's (SBEC is somewhat tolerant, JTEC
is a little picky, NGC1-4 is just plain out picky as hell and will put in
its own values if things go out of whack).
- Bernd
-----Original Message-----
From: Ray Block [mailto:bpracing@worldnet.att.net]
Sent: Wednesday, August 15, 2007 7:55 AM
To: dakota-truck@dakota-truck.net
Subject: RE: DML: RE: SMEC
> -----Original Message-----
> From: Gary Hedlin
>
> Few weeks ago I went to the stealer to get the trans fluid changed in
> the 98. While they were drooling all over it they asked if it was the
> original engine in there (I'm at 211,000 now). I said no, I had a
> slightly used one put in. Then they asked if I changed the PCM, and I
> reply no, still the original one.
>
> He then goes into some speel about how after 150,000 miles the engine is
> so outa factory specs that the PCM goes into a "braindead" mode where it
> doesn't monitor much and just provides enough functions to run the
> vehicle and it should have been replaced.
That's a good one, Gary! LMAO! I'd be finding myself another dealership
that isn't so creative in trying to sell unneeded parts.
Ya can't get much further "outa factory specs" than I am with all my mods
and the PCM just plain doesn't know or care what has changed as long as the
sensor inputs are within a range it can manage. All it has to do is adjust
fuel and spark timing accordingly.
Over time, your sensors or wiring harness may degrade and send false signals
to the PCM, but the PCM isn't gonna quit processing just because you've
driven a lot of miles or the engine is a little looser.
Think of it like your home PC. It's gonna give you the output you expect as
long as your input devices (keyboard/mouse) are working properly. If those
are worn out, changing the processor isn't gonna fix it. :-)
Ray
http://www.dragtruk.com/ENTRIES/20KM1FD2KWBP.html
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