First step would be to connect a voltmeter across the cold-start valve. See if you can relate what you see there with the symptoms. Normally expect the ECU to turn it on for a few seconds on cold start. If no voltage, likely not a valve problem, but check to see if it is shorted. If you do get a voltage, it will have to be removed to check for mechanical operation. If no voltage, a temp sensor may have failed - I don't know offhand which to have you test next. Check your service literature.

If both the valve and the control signals are normal, then you might just want to remove the ICV and clean it with throttle body cleaner, rubbing alcohol, or whatever does the trick. I used the latter on mine, but the other may be more effective.

Steve

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'91 MB 190E 2.3
'08 RAV4 Ltd 3.5
'83 Lazy Daze m'home 5.7