I’m just about done with installing a new engine on a 06 f150 5.4. I’m having trouble with finding where the two plugs go

 

One looks like the crankshaft position connector C101.
Photo of second connector is not clear enough for me to see.

 

Let me try a better pic

 

what’s C101 mean

 

Pretty sure that is the “connector number”, which is a reference in ford service manuals.

 

I looked at the photo in post #3 but did not find that connector in my wiring diagrams for my 2007 Ford F150, yours should be the same. Is it possibly the oil pressure sensor connector? I would look at a/c compressor area and any where else that the wires will allow connection. If you still cannot find it then take a nice clear photo of the wire colors and post that. That connector is familiar but I can't recall where it goes.

 

it’s the A/C compressor. Thank you so much for your help.

 

I have 2 of those plugs on the same side. One does go to the crankshaft position connector but the other one I’m unsure about.

 

So a couple of other possibilities
Knock Sensor 1
Knock Sensor 2
Heated PCV valve

 

nope not any of those.