Update - [s-cars] MTM 1+ upgrade ---now stalling

[William Perron]

Thanks to Bill M, Bruce M, Linus and Ray T who
responded.  I ended up checking all the hoses - all OK
no tears, all properly clamped and connected.  I also
removed the bypass valve and checked for proper
operation.  It too was ok.  I checked the O2 sensor-
working properly.  Also double checked spark plug
tightness.  Apparently the problem is actually in the
newly upgraded ECU itself.  I noticed that 1/2 the
time the "check engine light" flickers when the key is
turned to the run position- normally in my experience
this should be on continuously.  I can also hear
relays clicking and the ECU clicking whenever the car
stalls/ or is just about to stall.  Last night (colder
around 30 F) stalling was much more frequent - about
15 times during troubleshooting/driving.  Sometimes
tapping/lightly rapping the ECU will cause it to stall
also.  Sometimes it will crank and not restart.

So I will be sending my ECU back to Hoppen, I can't
say that I'm to impressed with there soldering
techniques.  Has anyone else had problems with
modified ECUs?

-Bill Perron
'85 4kq (driver)
'95.5 S6 Avant (paking lot ornamentation)

>
> > -----Original Message-----
> > From: s-car-list-admin at audifans.com
> > [mailto:s-car-list-admin at audifans.com] On Behalf
> Of William Perron
> > Sent: Thursday, March 27, 2003 8:16 AM
> > To: s-car-list at audifans.com
> > Subject: [s-cars] MTM 1+ upgrade ---now stalling
> >
> >
> > *Long*
> > I finally broke down and upgraded to the MTM 1+
> > chip/sensor in my S6 Avant.  Installed last friday
> -
> > took a few runs around in it and left it as I went
> > away for the weekend.  Drove it on Monday - got
> really
> > into the boost - evertyhing fine.  Car sat for
> tues
> > and Wed.  Got in car and drove to work - also got
> into
> > the boost.  Pulled into work , parked in spot and
> > idled for 10 sec.  Then the car just died.  I try
> > restarting - starts instantly.  Sat there for
> another
> > 30 seconds idling- everything seems fine.  Shut
> car
> > off.  Go out a few hours later to make a run over
> to
> > my companies test facility.  Get moderately into
> boost
> > on trip over.  COming off the highway I coast to a
> > stop .  Car dies- I restart w/ no problems.  Drive
> up
> > to stop sign a few block later car dies- restart -
> > dies 2 sec later. Restart.  Manage to get it to my
> > condo by holding foot on gas at stop signs/lights
> .
> > Park in condo spot - car idles fine??  Pull codes
> -
> > only one 2214 "engine overrev"??-- I don't
> remember
> > getting it up even close to the redline.   Car
> idles
> > for 5 minutes and seems fine.  Ended up driving
> the
> > trusty 4kq back to work.
> >
> >
> > Any ideas on what the problem is ?
> >
> > Vacuum leak?
> > I am still on the stock hoses and bypass valve at
> 74k.
> >  Would failure of these cause stalling?
> >
> > Bad ISV?
> >
> > Other likely culprits?
> >
> > Help!
> > -Bill Perron
> > '95.5 S6 Avant
> > '85 4kq
> >
> >
> >
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>
>


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