Id of sensors

[Rlshearin]

Bought an 1999 expedition and noticed there are two sensors that not plug in nor I can find the wiring to them. Can't tell what they are.
Can you help?

 

[Killer Ride]

They are probably the knock sensors some of these motors had the sensors and not hooked up because they found they were not giving good readings. And this was also early on for new features with this particular family of motors

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[Hamfisted]

They appear to be in the water jacket cross-over pipe. Normally you would have pipe outlets there to connect heater hoses. But it looks like some previous owner deleted the hoses and used some old sensors that would thread into the holes to plug the holes. The one right under your finger in the pic normally feeds the heater core(s) in the dash. Do you have heater hoses at the firewall ? Have any heat ? The Expy might've had a leaky heater core and the owner just deleted the supply to the core. But don't expect to find any wires for those senders. The second "sensor" down lower is plugging a port where hot water usually come out to heat the throttle body on vehicles optioned with the cold weather package from the factory. It was a 3/8" hose that went to the base port on the throttle body. If you're not in extremely cold climates you don't need it.






It should look something like this .... but with a control valve inline...





Hot water inlet port on throttle bodies equipped with cold climate option.....

 

[Killer Ride]

Actually that is an Intake air temp sensor.
Sorry didn't see the piture. It was utilized on the Lightning models

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