1990 100 Refuses to Start

[Theodore.Haug at rrd.com]

Doug,

Thanks for reply.  I think maybe I should change the heading to refuses to
start.  Here are a few answers to your questions.  The engine cranks fine,
all the electrical accessories work fine, so I don't think it is a voltage
drop issue.
Here's the scenario:  put the key in the ignition, and turn to the
accessory position, all the accessories work, but the dash warning lights
to don't come on, nor do any of the guages register (normally the fuel
guage rises; temp guage comes up; etc).  Turn the key to start position and
the starter cranks the engine over just fine, it just doesn't start (and
still no guages or warning lights)  Strangely, the fuel pump doesn't prime
the system either, when the key is put in the accessory position.  I am
really starting to suspect the ignition switch, but I am having a hard time
with that because it is brand new.

Things I have tried:  checked all the fuses; tried a different load
reduction rely; tried an another fuel pump relay; I haven't tried changing
the ignition switch, but I can try that after work.   Any other suggestions
would be appreciated.

Cheers,

Ted



                                                                                                       
                      Doug Yoder                                                                       
                      <yoderw at msoe.edu>        To:       Theodore.Haug at rrd.com                         
                                               cc:       Quattro List <quattro at audifans.com>           
                      06/02/2004 11:14         Subject:  Re: Hard Starting 1990 FWD 100                
                      PM                                                                               
                                                                                                       
                                                                                                       




Theodore.Haug at rrd.com wrote:
> Hopefully, someone has encountered this before, and the fix is
> simple....the patient is a 1990 Audi 100 FWD - the car has been starting
> beautifully of late.  Until this afternoon anyway.  I recently replaced
the
> electronic portion of the ignition switch (three weeks ago), and the car
> has been fine.  Today, however, she is difficult to start, and I have no
> dash warning lights, or working instrumentation when the key is turned.
> The accessory portion of switch works fine, I can turn on the headlights,
> and the climate control unit is working.  Then I turn the key to the
start
> position and the starter turns and engages, but she doesn't want to
start,
> and none of the instrumention seems to work and no dash warning lights.

No lights/etc when cranking sounds to me like voltage drops drastically.
  Could be the starter failing, or could be a short in the ign switch (I
would tend to think not, since it worked for three weeks after you
replaced it, but something may have gotten rattled loose).

Difficult to start how?  Slow cranking?  Cranks fine but never catches?
  Cranks, and almost catches?

-Doug

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