Almost but no cigar yet

[Vereeken]

I have done my research on the board so have come down to the cold start valve and the Thermotime switch. Some things arenot quite clear yet so I would be grateful If anyone could shed some light on the remainder of my questions. This is a 82 SC ROW.

1. The thermotime switch is ONLY powered when the starter is turned and temp is below 98 fahrenheit? YES/NO

2. The cold start valve is ONLY powered when it receives input from the thermotime AND the starter; meaning temp is below 98 and starter is turned? Yes/NO

3. The thermotime activates the Cold start valve and the latter dumps extra fuel in the runners? But for how long?

4. Assume we are above 98° and the starter is turned on a dead cold engine. Does the cold start valve operate by itself? If so for how long?

I have narrowed my -annoying problem- to these two CIS components. My problem is that te engine always stalls until after warmed up a couple of minutes (10 or so). The Idle jumps up and down until slightly warm.
My WUR cold start pressure is spot on, the AAR opens and closes within the required parameters; my AFR at warm engine at IDLE is 14.9 (with Innovate LFM) and my IDLE is 990 rpm spot on when warm. The decel valve works as she should. Fuel Pump cocked out last year and was replaced with a new one inc. the valve.

I can see that my Thermotime does not get power (and I think to now why). I am assume I shoudl read 12v when reading from the yellow wire and GND?

Do you think I am right?

Thanks already.

[Early_S_Man]

The Thermo-Time Switch is rated at 45°C, I believe ... 112°F, hence my reference to the Cold-Start Valve as Not Real Hot-Start Valve!

1. No
2. Sort of ...
3. Yes, less than a minute ... ~45 seconds, max., approximately, if the starter is cranked that long!
4. No

Per the diagram below ...

The following sequence only happens while starter is operated!!!

If you follow the Yellow #15a lead from the second set of contacts in the SC starter solenoid to the 'G' terminal of the Thermo-Time Switch ... +12 Volts is only applied to Colt Start Valve and heater of Thermo-Time Switch while starter is operated. If bi-metallic contact inside Thermo-Time Switch is below 112°F, then the contacts are closed, supplying a ground path to the Cold-Start Valve from terminal 'W'.

[Superman]

I'm not sure how any of the circuitry works and if my advice ever conflicts with that of Early_S_Man or John Walker, ignore my advice.

On CIS systems, the "choke" is a combination of the Auxilliary Air Regulator and the Warm Up Regulator. Together, they allow more air, and a richer fuel mixture, into the engine. When the engine is not yet warm. So....there is no need for the Cold Start Valve to operate more than just a few seconds.

The CSV sprays fuel into the engine simply because, until the engine creates a vacuum and a breeze past the Air flow Sensor Plate, the six regular injectors will not spray. The CSV simply creates enough engine speed to raise the Air Flow Sensor Plate, basically.

It is the CSV that creates the initial "whump" of engine activity during startup. "Whump" is a term that does not appear in any of the German technical bulletins, curiously. It may be one of those Italian engineering phrases. Probably is.

[Vereeken]

Bummer. From what I can read by Early S man and Superman; higly unlikely that it going to be the thermotime and CSV taht are going to sort my problem. Back to the testing board.

The car is really easy to start even when dead cold; its just that idle hunting when cold that annoyes me. Any other ideas on what coudl be the issue?

Michel

[Vereeken]

"Whump" is a term that does not appear in any of the German technical bulletins, curiously. It may be one of those Italian engineering phrases. Probably is. [/B][/QUOTE]

It is in my dictionary. It can be found next to the CLOINK.

Michel