(no subject)

[Roa, Greg]

>Couple months ago, I had the whole "tach straight to 0" stalling 
>problem.  Eventually popped in an Ignition Control Module from my old 
>83... fixed the problem.

(snip)

>The tach seems to be shooting straight to 0 again as the engine cuts 
>out and back in (as it did when the 1st ignition control module was 
>dying).  As far as I can tell, the hall sender and it's wiring are 
>good... 

(snip)
>Maybe the coil?  Maybe I just need to take it to my damn 
>Audi tech?  

That would be one of my guesses (the coil, not the audi tech).  I have a 86' 4kq that had a problem with a melted ICM.  I replaced it, the car was fine for a little while, then started acting up again.
Replaced the ICM again, same story.  Would be good for a while, then act up.

After replacing the coil, the problem didn't return.

I'd also make _sure_ that your hall sender wiring is good- it can look fine, but not really be fine.  If the plastic bracket that holds the connector to the distributor is broken, use a zip tie or some sort of method to secure it back on.  The wires can be mostly broken inside the insulation, and lose continuity with movement.

Good luck!
Greg Roa
86' 4kcsq x2
87' 5kcstq
93' 90CS
83' 944