Cold weather warmup problem C2 Turbo
 

Every winter when the weather gets cold (for us in Tx), my car develops a strange problem, under 40 degrees. Car starts great and after about 2 miles the engine stops completely, I mean off ! Then as long as I'm moving along and keep it in gear it restarts. It does it again a few moments later , then as it warms up everything is ok again.
It seems as it hits a certain temp it shuts down and then once past is normal again.
My shop has checked everything and no faults. Since it only happens when cold weather arrives and only for a few short moments this is hard to diagnose.
Any thoughts?

You checked out the isv (idle stabilization valve)?

It doesn't die at idle, I am usually in gear and for example on Sunday, traveling at about 60MPH when it occurred twice within a minute o so then completely went away.

The 964 Turbo doesn't have one. It's CIS and only has an idle bypass screw.
RS, can you smell gas when it dies?
Have you checked cold and warm control pressures? That and your thermotime switches would be a good starting point.

This is the worst kind of problem to troubleshoot - an intermittent related to environmentals. I think you have a bad electrical connection caused by cold temperatures such as a cracked solder joint or a loose wire in a plug or a jack. You will have to go hand over hand on all the circuits that could cause instant engine shutdown. I would start with the fuel pump circuit and then the ignition 12V supply.

Good Luck,
Mark

Paul, no fuel smell. Pressures were checked. Thermotime switches might be cause.
Mark, My mechanic agrees with you, but since it never lasts more than a few seconds he don't think it's worth the expense in trying to find the problem. If it gets worse and shuts down completely it would be worth the time. He says it might even be in the ignition switch.
I'll check the fuel pump circuit that is easiest.

I have had these kind of problems with the crank sensor I'd try a new one it's cheap and easy