I have a low-miles 94 Sable 3.8 L. I only get a road speed after warm up.
When cold, electronic speedometer and transmission don't get speed reading,
causing transmission to go bonkers, problems disappear after 15 min. Already
spent $200 replacing sensor and connector. Tried swapping ECM. Measured
sensor resistance, 197 ohms hot, 213 cold. Is it possible sensor isn't
spinning? I can't reach in there and feel it to find out. Any ideas?