You are correct that the cold start valve is only on during cranking of a cold engine (below 95 degrees). What I meant to say without getting too technical is that on an initial cold start even after you stop cranking the engine, until the raw fuel from the cold start valve is vaporized and consumed the idle motor cannot take full contol of the idle. So even though it is true that the cold start valve is closed as soon as you release the starter the effects take a moment to wear off during which the idle will be "unstable". I hope this clears up my description for you. David Teitelbaum vin 10757 --- In dmcnews@xxxx, "Walter" <Whalt@xxxx> wrote: > David, > > Are you sure about this? You say, "A cold motor will hunt a little > initially but > quickly calm down as the cold start valve shuts off. " I understand that > the cold start valve only operates WHILE the starter is engaged IF the > thermo-time switch is cold