WTB D Jet Cold Start Valve Options

[jack20]

Hello,
Looking for a functional CSV/injector for my '74 2.0 d jet.
Thanks,
Jack

[BeatNavy]

All references I've read suggests your guy is wrong (unless he considers below freezing "moderate" temps). I can also tell you I've tested a couple of TTS by putting them in the freezer. After taking them out of freezer and into room temperature environment they quickly "go off."

Copying and pasting directly from Anders' site (note temperatures at bottom). So unless you're starting in below freezing conditions (or colder), it's not really doing anything.

The cold start valve provides a fine mist of fuel in the intake manifold to richen the mixture during cold starts. For most of us living in the continental US, the valve doesn't turn on except in the coldest months of the year. The valve is controlled by the thermo- or thermo-time switch and operates independently of the ECU. The valve is active only when the key is in the "start" position and the temperature is below the set point of the thermo-time switch. Actual measurements of the switching temperature of a sample thermo switch (311 906 161 C) indicate a lower temperature than quoted by the FWM, somewhere closer to 0 deg. C / 32 deg. F.

Jeff Bowlsby found a reference (VWTG) that has a table of actuating temperatures for the early and later thermo switches, but not the thermo-time switch (note there is an error in the units conversion of the entry in the VWTG for first sensor listed below that has been corrected here):
◦311 906 161 : -12 to -18 deg. C / 10 to 0 deg. F
◦311 906 161 A : 0 to -10 deg. C / 32 to 14 deg. F
◦311 906 161 B : -2 to -8 deg. C / 28 to 18 deg. F
◦311 906 161 C : -6 to -14 deg. C / 21 to 7 deg. F