My 4.6 Cobra Futura idles fine when it's cold but won't idle and stalls after it reaches operating temperature. The stall problem seems to have started last summer after I took the Vehicle Speed Sensor (VSS) from the transmission to count the teeth on the gear. (Speedometer reads low.) The OBD2 is giving a code that the VSS isn't sending a signal to the computer. I didn't remove the speedometer cable when I took out the VSS, so the speedo cable probably pulled the VSS electrical connector in tension and broke a wire.
How does a VSS work - is it a pulse generator whose frequency varies with speed or is it a variable voltage generator?
I'm waiting for a break in the weather so I can take out the transmission electrical harness and check the wiring. The Shelby-American All-Ford meet at Mustangs Unlimited is only five weeks away.
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