[V8] Idle Problem Returns to The Twilight Zone

[Tim Hollister]

I would like to get a copy of the 5spd eprom. i have a
copy of the at eprom from my 90 and a copy of a
"chipped" eprom that wont run in my at from a 5spd. i
would like to do some comparisons on them

--- urq <urq at pacbell.net> wrote:

> ... thought I'd reported it here before ...
> 
> I can't speak to the automatic case, but I can tell
> you that a 5-speed runs 
> just fine with an ECU from an automatic car.  I can
> also say that an 
> "automatic" engine runs fine in a five speed with
> the 5-speed brain ... 
> AFAIK there are no connections between the IC and
> ECU that the 5-speed ECU 
> cares about.
> 
> It does seem a bit odd that the good whack cured the
> problem ... the only 
> part that is socketed in the ECU (as I recall) is
> the EPROM itself ... even 
> the board to board interconnects are hard wired.
> 
> I have not saved the EPROM code from an automatic
> car ... but I do have a 
> copy of the EPROM and can read it in if needed.  I
> have soft copies of the 
> contents of the 5-speed EPROM ...
> 
> I can also speak to the IC situation ... before I
> knew any better I bought a 
> car that had an automatic cluster installed ... it
> worked just fine ... just 
> the PRNDL display was lit.  Later I removed the back
> lights, and even though 
> the LCD elements are all still visible in some
> lighting conditions, it isn't 
> very noticable ... the only thing that is odd is
> that when I connected up 
> the MIL wire, the incorrect indicator illuminates on
> the cluster ... not 
> sure if this is due solely to the fact that this is
> an automatic cluster or 
> something else.  I picked up a 5-speed cluster (I'd
> almost bet these will be 
> rarer than ECUs!) which had a cracked bezel.  I've
> removed a bezel from an 
> AT cluster and will glue it on my 5-speed IC when I
> figure out how to polish 
> out the scratch I made removing it ... :-( ... The
> plan is to swap the 
> speedo between clusters when I do the overall swap
> ... that way the mileage 
> will not change ...
> 
> ... final comment ... there is no "resolder fix" for
> these ICs ... I suppose 
> an application of solder would definitely cure the
> interconnection problems 
> ... but it would render it impossible to disassemble
> in the future (but 
> then, I suppose I might never misbehave again :) ...
> the fix that I use is 
> to use DeoxIt (or equiv) on the internal connections
> ...
> 
> Steve B
> San Jose, CA (USA)
> 
> >
> > My WAG is that the ECUs are identical except for
> the EEPROM chip.
> > It is possible that there other electronic parts
> included/deleted based on 
> > the
> > transmission type, but the circuit board is most
> likely the same.
> > That being the case, an automatic ECU should be
> just fine in a manual car 
> > as
> > long as you swap the EEPROM.
> > This could be confirmed by carefull inspection of
> the circuit boards. The 
> > fine
> > folks at IA would probably also know the answer to
> this.
> >
> > btw, I wonder if anyone has saved a copy of the
> EEPROM data for both auto 
> > and
> > 5-speed boxes?
> > That would be a smart thing to do so we can
> re-purpose ECUs. As time goes 
> > on,
> > these things are going to get even harder to come
> by.
> >
> >>
> >> I'm hanging onto the other ECU just in case. 
> There's a chance that both
> >> computers have the same problem, but that seems
> unlikely.  Because some 
> >> of
> >> the signals to the Motronic come from the IC, I
> wonder if there's 
> >> something
> >> going on there.  Any differences between the
> 5-speed and automatic 
> >> clusters,
> >> apart from the speedo constant?  I'd like to have
> spare parts or at least 
> >> a
> >> chance of getting them before attempting the
> resolder fix.
> 
> 
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