[urq] Cold start valve ?

[Buchholz, Steven]

The urq is *very* sensitive to battery voltage when cranking ... if you think the battery was low that may be all it was.  The ECU is what fires the ignition coil based on inputs from the two flywheel sensors and the Hall Sender on the distributor.  

I've always been of a mind that the CSV does more harm than good when starting ... especially when the "Hot Start Pulse Relay" starts clicking on and off.  Of course, I've never had to start my car at -20C ... I'd bet the CSV is only helping there!

Steve B
San José, CA (USA)
> 
> So, last night and this morning, at -20C, my beloved urQ refused to
> fire, for the first time in years. I suspect the cold start valve,
> since I didn't smell any gas, and it finally catched after a long
> cranking period, with the help of another battery. Otherwise, car runs
> fine, and pull strongly thanks to cold air (yeah!).
> 
> So question: what is the firing sequence, or circuitry for the CSV ?
> Which sensor provides the signal ? Is the ECU involved ? How to test it
> easily ?