[s-cars] cars] Momentary cut out under full boost

FvAMI at aol.com FvAMI at aol.com
Fri Oct 26 07:44:10 PDT 2007


Per our discussion your speedo indicating zero before it happens is 
potentially a problem and the first place to look.

The signal from the speed sensor goes into the ECU. The ECU reads this signal 
and sends a pulsed signal to instrument cluster. It also uses it to control 
the AC ... maybe others. Although I do not know if it read 0 it would cutoff 
the ECU under boost.

If your speedo goes to 0 it could mean

1) Speed sensor going out or bad connection. (not sure if ECU cuts boost 
under these conditions).
2) ECU going bad.
3) Bad connection to the ECU. Momentary short somewhere causing the ECU to 

Best regards,
Feico van der Laan

In a message dated 10/22/07 5:42:34 AM Pacific Daylight Time, bullitt at gwi.net 

> > Hi Gang
> >
> > My 95.5 avant has begun a bad habit.  Occasionally under full boost the 
> > car
> > will shut off entirely.  It is not a misfire or a stumble.  It is a 100% 
> > cut
> > out as if you turned off the key.  The speedo also goes to zero at the 
> > same
> > time.
> >
> > Im running the 034 high output coil kit (no pos) which solved my previous
> > coil related misfire.  Car is running mtm 1+ software with the awesome 
> > vmap
> > but otherwise stock.
> >
> > Any ideas of where to start looking?
> >
> > Thanks in advance
> >
> > Aaron

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