Can an ECM "learn" how to start the car better?

[Len Sabatine]

At 10:52 AM 6/14/00 -0500, you wrote:


>On Wed, 14 Jun 2000, trax wrote:
> >
> > The computer doesn't adjust fuel mixture in open loop mode.  It used
> > whatever values are in the table.  Its not until closed loop mode that the
> > O2 sensor can be used and therefore, the ECM can now adjust the fuel
> > mixture.  The ECM can't adjust the AFR unless it knows where the AFR
> > currently is.  The O2 needs to be 'in play' in order for the ECM to be able
> > to determine what the current AFR is.  During a cold start the ECM is in
> > open loop mode ... no O2 .... no fuel adjustment.  I can't really explain
> > why everything seems to be working AOK now for you.
> >
> > tim
>
>It does not adjust the mixture in open loop, but it can use the
>BLM's that it learned from the last time it was there.   If you where
>to clear the computer and then it starts running badly again, then you
>may have your answer, it is remembering what was thought to be the
>best mixture that it previously figured out.
>
>                                 Roger
      "Adaptive Memory"  does Learn Idle quality and "remembers what it
learned the last run time, unless the ECM  lost bat power and the learned
adjustments are cleared from memory. Then it will need to relearn, as I
understand the process. Although the Adaptive learning is somewhat
narrow in range , it helps some combinations run considerably better.
Part throttle "brisk" acceleration speeds up the learning process as
well .

          Len


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