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Registered
Join Date: Jul 2003
Location: Perfidious Albion
Posts: 4,184
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If it's like the CIS cold start valve circuit in the 930, it only operates
* when energized by the starter solenoid circuit
* until the thermo-time switch reaches 45 degrees
Note the TTS also has a 3w heater built into it to prevent the CSV flooding the motor; folks have observed this working for as little as a second or two, and I've seen 7 seconds quoted for -20C.
Ran my car for 12,000 miles without the TTS connected - hence no CSV - and it started as usual with ice on the windshield/ground. Hooked up the TTS, and can't detect any difference in cold-starting.
I'd be looking at the cold control pressure first, so long as the CSV doesn't dribble fuel when cranking, likely not the problem.
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'77 S with '78 930 power and a few other things.
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