No Start '94 100S...the common suspects have been eliminated...ideas??

[Elliott Potter]

Dead fuel pump/relay?  Bad engine speed sensor/wiring? 
Camshaft/Crankshaft position sensor signals out of sequence (this would
happen if the cam belt jumped a tooth)?  Bad wiring/ground connection to
ECM?  Just some thoughts.  I assume that when you say the crankshaft
position sensor is working properly, they also checked the wiring coming
to it.
--
Elliott

Cwalln at aol.com wrote:
> 
> My '94 100S has been perfectly reliable for the 5 years I have owned it.  Two
> weeks ago, it would not start...no problem turning over...a computer
> somewhere appears to be not giving the ok to start...towed the car to a shop
> great in diagnostics.
> 
> No error codes.  The shop has been going through and swapping out computer
> parts from a same vintage, but running Audi, in an attempt to identify the
> problem.  The common suspects, the crankshaft position sensor and the
> ignition control module appear to be working properly.
> 
> Before the shop goes the next step and pulls the main and very expensive ECU
> deeply buried behind the glove box...has anyone out there seen this kind of
> problem, or have some ideas on how to find the culprit?
> 
> Even the Audi technician at the local dealer is stumped.
> 
> Chris W.
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--
Elliott
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