Steve
I would change the thermostat and check the thermostat housing for
any obstructions. I believe your temp spike is due to the thermostat not
opening properly and you get a momentary steam pocket at the sender.
I prefer to use a 180 degree thermostat. Ford engines are designed
to have less internal wear when the operating temperature is in the 180
neighborhood. Also living in NY State I prefer to have good heat for the
cooler night we get.
Happy Thanksgiving
Ron Fraser
Ron:
The temp sender is on the intake manifold (Tiger). The thermostat is a
160 degree piece. I'm not sure how or why an air bubble would just set
itself under the temp sender though.
Steve
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