Another Casualty

[ae2598 at wayne.edu]

Boy, I wouldn't want to play with a voltage source that the ECM uses for
its sensor measurements!  Besides, consider that the 5VDC regulator is
inside the ECM.  By drawing power from that source, you're causing the
regulator to run a little hotter!  You're better off tapping into the
incoming 12V from the alternator.  The fan wouldn't need a regulated
source, and most of the PC "muffin" fans run at 12VDC anyway.  As far as
Pentium chip fans, I wouldn't think they'd do much good for cooling the
whole ECM, anyway.  If there was one particular IC (or region of the PCB)
that needed more cooling than the rest, it might do.  But, I'm guessing
that you'd want steady airflow through the whole ECM.


On Fri, 20 Jul 2001, Gonyou, Jeremy (.) wrote:

> 
> There's the 5V reference...I wonder if a fan would be too much load for that.
> 
> -----Original Message-----
> From: Programmer [mailto:nwester at eidnet.org]
> Sent: Friday, July 20, 2001 10:08 AM
> To: gmecm at diy-efi.org
> Subject: Re: Another Casualty
> 
> 
> Yeah--maybe one of those chip cooling fans...is there a 5 volt source inside
> the ecm ?
> 
> Lyndon
> ----- Original Message -----
> From: Gonyou, Jeremy (.) <jgonyou at ford.com>
> To: <gmecm at diy-efi.org>
> Sent: Friday, July 20, 2001 5:28 AM
> Subject: RE: Another Casualty
> 
> 
> >
> > Yeah, it was about 90 yesterday.  My ECM is not underhood, but is
> underdash.
> > After work I got in my car and everything fired up fine, but wouldn't run
> on my socketed memcal.  I tried about a dozen combinations of known good
> chips and memcals - nothing was conclusive.  I replaced the ECM *and* memcal
> and everything is fine now...I'm just not %100 sure what happened.
> > I'll go with the overheating thing for now...
> >
> > Thanks for the help, guys (and the sandwich jokes).
> >
> > Jeremy
> >
> > Bit of incriminating evidence:  I usually leave the memcal cover off for
> quick prom changes.  This probably didn't help.  Yesterday I put velcro on
> the cover so I don't have to operate a nut driver to take it off.  Maybe a
> fan would be a good diy project?
> >
> > -----Original Message-----
> > From: Programmer [mailto:nwester at eidnet.org]
> > Sent: Thursday, July 19, 2001 5:21 PM
> > To: gmecm at diy-efi.org
> > Subject: Re: Another Casualty
> >
> >
> > Really hot day there ?? This may sound funny--but pull your ECM and stick
> it
> > in the fridge for an hour...and re-install it. If it fires up
> fine...butter
> > it, it's toast. Did you sandwich cost $7.30 ??
> >
> > Lyndon.
> > ----- Original Message -----
> > From: Gonyou, Jeremy (.) <jgonyou at ford.com>
> > To: <gmecm at diy-efi.org>
> > Sent: Thursday, July 19, 2001 11:17 AM
> > Subject: Another Casualty
> >
> >
> > >
> > > So I go out to Wendy's to get a sandwich and when I get back my Sunbird
> > has a high idle, constant SES, and no ALDL comms.  I replaced my hacked up
> > memcal with a bone-stock unit, but the same stuff...limp home.
> > >
> > > Is it just me...or did my ECM go out to lunch the exact same time that I
> > did?
> > > Is this how the '7730s go, just all the sudden?
> > >
> > > Jeremy (limping home)
> >
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> 
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> 


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