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It's good that you're reading up on Kjet, but I'm not sure about replacing either of those items arbitrarily. Do you have the Bentley 240 manual? Even though it's for '83—'93, it covers your turbo FI very well.
How cold is "cold" in Lake Charles? I ask because the TTSwitch (which provides ground for the CSValve) only works in really cold conditions, i.e., it only allows about 8 seconds of CSV operation at 0°F. Also, the turbo has an Impulse Relay that overrides the TTS and pulses the CSV regarless of the temperature. The Bentley manual has procedures for testing both the TTS and CSV.
Another possibility (known but not all that frequent) is the Control Pressure Regulator, or "Warm Up Regulator/WUR" as Bosch calls it. The WUR's main job is to richen the fuel mixture for Cold Starting (and the first 2 or 3 minutes of cold running) by lowering the Control Pressure, then gradually raising it to the warm running level.
Unfortunately the only sure way to diagnose the WUR possibility is with a special fuel pressure gauge setup that most current shops or mechanics won't have—unless they worked on Volvos or VWs from late '70s thru the '80s. If you plan to work on Kjet for any length of time, the pressure gauge is $58 + shipping at JC Whitney, which is the best price I know of.
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Bruce Young
'93 940-NA (current), 240s (one V8), 140s, 122s, since '63.
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