Prom problem?

[Shannen Durphey]

Sometimes one can run into trouble using BL/int values stored while previous prom
was running.  Also, can be really surprising to find a leftover trouble code stored
for a prom that you know has that code disabled.



Bob Valentine wrote:
> 
> You're supposed to unplug the ECM every time?   (*grin*)
> 
> I have a NC pushbutton switch that I've been meaning to put inline with
> power to the ECM for easy resets.
> 
> -> Bob Valentine
> -> bob at tecmark.com
> 
> At 12:52 AM 3/6/2001 -0700, you wrote:
> >Is he perhaps leaving the PCM plugged into the harness when doing the chip
> >change ?
> >
> >Lyndon.
> >-----Original Message-----
> >From: Bob Valentine <bob at tecmark.com>
> >To: gmecm at diy-efi.org <gmecm at diy-efi.org>
> >Date: March 5, 2001 9:51 PM
> >Subject: Re: Prom problem?
> >
> >
> >>I've had this occasionally with my '730 (running 730 code *^),  Reseating
> >>the eprom usually fixes it.   Sometimes the idle goes wierd after a new
> >>chip, quick cycle of the power to the ECM fixes it every time.
> >>
> >>I've learned is to watch the CEL after putting in a new chip.  If it
> >>doesn't do one quick blink after power up, something's wrong.
> >>
> >>-> Bob Valentine
> >>-> bob at tecmark.com
> >>
> >>
> >>At 08:07 PM 3/5/2001 -0600, you wrote:
> >>>Well I'm having a slight problem with the 749 code in the 730.  Seems when
> >I
> >>>swap chips the ECM wants to get a check engine light and run like total
> >>>crap.  I pull the power and EPROM and swap everything back and forth and
> >>>after a couple times and then it works.  Anyone know a way around this?
> >>>Like something that works almost all the time.
> >>>
> >>>Dan
> >>>
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> >>
> >
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