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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
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