Interesting ride to work

DGraber460 at DGraber460 at
Thu Mar 15 21:06:58 EDT 2007

This AM, I am jaunting on to work with the usual Audi flare when at  ~60 mph 
steady speed that old URQ went spark dead. Tach dropped to zero.  No noises, 
bumps, etc. I coast to the side of the road in gear all the  while jiggling 
everything I can think of (including the ignition switch) to no  avail. All the 
other electrics worked fine but the tach didn't even bounce. 
Once stopped, I offer a heavy sigh of "What Now?!", and turn off the  
ignition. Figuring I had nothing to lose, I turn it back on and crank it and it  
fires right up and ran fine the rest of the day.
My first guess is the TDC flywheel sensor. Is there anything else that will  
totally cut spark this way?
Maybe I have a Microsoft programmed ECU, and just wants to be "rebooted"  
once in a while.
My other URQ did something similar about once every 9 months, but would  buck 
and backfire and finally completely die. It would also start right up after  
the "reboot". Not sure but I might be using the same TDC sensor from that  car.
Are these sensors still available new? If so from where? The used spares I  
have are all a bit dodgy.

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