Fuel Pump Relay question

[Chris Hall]

Lol.  I'd love to see a pic of the "Gentleman's Express".

Nope... car doesn't have an RPM sensor... but I think we're on the
right track thinking that there's a wire in there that goes to the
ECU.

If I determine that it's defiantly a wire issue in that MESS, then I'm
just shipping it to my Audi "tech" and he can find it... I don't have
the patience.



On 6/4/05, Unka Bart <gatorojo at earthlink.net> wrote:
> Hi Chris, others,
> 
> > Ok... went back out and started playing with the Relay / Fuse box tray
> > some more.  I'm almost certain the problem is in the wiring (which
> > SUCKS) under the tray.  You know... EVERY SINGLE WIRE in the car runs
> > through there.  Yeah... that's gonna be easy to diagnose.
> >
> > Almost every time I shook the tray as I had it unclipped from the
> > mount, the engine would die.  Then, as the car was cranking and
> > cranking, I'd shake the tray and VROOM.  I'd say 85% of the time,
> > shaking the tray stalled the engine.
> 
> [snipped the rest]
> 
> This sounds very much like what plagued me with the Gentleman's
> Express.  It turned out to be the RPM sensor which has a loose
> connection/connector.  When the engine rocks, the wire from the
> connector to the sensor itself pulls on the connector and breaks
> contact.  The CPU reads this as "no RPM" and shuts down the fuel pump
> relay, in turn shutting down the fuel pump and killing the engine.
> Dave Head discovered this while bumping the wire from the connector to
> the sensor and then we dug out the wiring diagrams and verified that
> this was what was happening.  I don't know if you have an RPM sensor
> like the V8 does, but I'd have to believe that something with an
> intermittent lose connection is causing the CPU to get a "no RPM"
> message and signal the fuel pump relay to shut down the fuel pump.
> 
> Perhaps one of the wires in the tray that you are shaking leads to a
> failing sensor or one with a loose connector.  If you have an RPM
> sensor, I would suspect that to be your culprit.
> 
> yer kindly ol' Unka Bart
> 
> 


-- 
Chris Hall
badcomrade at gmail.com
"making girls cry since 1974"