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Depends on the version of the software. There are some rarely used programming functions on some versions that use the cold start switch. It is also used for the not yet released closed loop mode that uses the O2 sensor for feedback. (Please don't ask when this will be done)

The cold start used to be the only way to 'choke' the engine for starting. The primer function has more or less taken over that function. The Cold Start input is now mainly used for the injector failure backup mode.

Tracy

On Mon, Mar 15, 2010 at 12:35 PM, Al Gietzen <ALVentures@cox.net> wrote:

. The original reason for the cold start switch (I think) was to act as a choke to richen the mixture on starting. Then because it was there, it is used in the programming process.

Bill;

Not to dispute your point; just to point out that the cold start switch is not used in the programming (at least not on my EC2).

Al G