Cold start problem
 

It is about 28 degrees here this morning and my car would not start right away. When it gets this cold I need to turn it over, switch the ignition off, turn it over again for a second or 2, off again and after 5 or 6 repetitions of this it starts and is fine for the day. It seems as if the computer does know it is cold. Anyone have any help on this. Is there a way to "choke" the system manually?
Thanks

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1984 Targa

Start simple and check connections to the Thermo-time switch (on drivers side chain cover). Check connection on cold start valve. I can e-mail you some specs for checking the thermo-time switch if you need to go further.

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Robert Stoll
83 SC
83 944

Thermo-Time switches were used on MFI and CIS systems to provide an extra fuel squirt during the time the starter was operating, but it is not needed on DME engines.

There is a head temp sensor on cyl #3 that has had 'issues' for years! There is also an Intake Air Temperature sensor. Both are Negative Temperature Coefficent resistance sensors, which means higher resistance when cold than hot.

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Warren Hall
1973 911S Targa

Woops! Sorry.

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Robert Stoll
83 SC
83 944

You can take a reading from the computer to see if the sensors are "talking" to the computer. Haynes has a manual called COMPUTER CODES. You can get it at auto parts stores. It tells you how to retrieve the codes via the gas pedal and check engine light. Then you just cross reference the codes in the chart provided. Takes the guess work out of diagnoses. Also what about fuel pressure? Maybe the car isn't retaining pressure from the previous night.

Bobby