[s-cars] CPS or no CPS, that is the question.

[Douglas Fifield]

Bob,

I had a similar situation long ago.  Engine would cut out every once
and a while and then run fine.  Finally, it died completely on the
freeway and required a flatbed to the wrench.  Initially, the
suspicion fell on the CPS, but after some sleuthing, the wrench
decided that it was something inside the CPU.  Sometimes the car would
start, but when the CPU was tapped with the handle of a screwdriver,
the car would die.

Turned out that it was a bad eprom that was part of the MTM chip
upgrade that I had done a couple of months prior.  A new chip was
swapped in and I have not had that problem again.  Though I did have
to put a new CPS in a couple of years later.

HTH,  Douglas

On Sat, Sep 6, 2008 at 3:40 PM, Robert Myers <bob at chips-ur-s.com> wrote:
>
> Hi again Y'all,
>
> A couple of weeks ago I was forced into the infamous BFPHFH (large
> pot hole from heck) and the car suffered a BIG jar at the RF
> corner.  A second or so later the engine faltered and then
> immediately caught again.  The falter was a complete engine shut-off
> not just a missing cylinder.  The falter happened again another 5-6
> timr before I made the last two miles home.  The car, at that time,
> felt like it did back months earlier when I had a failed CPS (crank
> position sensor) so I replaced the CPS and the car ran fine again -
> for a while.
>
> So - today - I took the S6 out to pick up some stuff for the better
> half.  Engine faltered three times on me.  Just like before I
> replaced the CPS.  I'm thinking it wasn't the CPS.  Now what sez
> I?  I didn't notice whether the tach responded to the falter or
> not.  I wasn't really looking for it and I didn't notice any tach
> activity with peripheral vision.
>
> Suggestions?
>
> Bob
>
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-- 
Douglas in MN
95.5 Audi S//6 Avant
73 BMW R60/5 mit Toaster Tank