1999 2.5 no power

[freeclimber]

vacuum leak can cause spark knock.

[package123]

ok it has been cool in the mornings for about two weeks now and the truck has ran like a well oiled machine but in the afternoon it warms up to mid 70s and the truck runs terrible

[freeclimber]

Check the resistance and voltage drop of your engine coolant temp sensor.
50degF---58,750ohm with 3.52v voltage drop
68degF---37,300ohm with 3.06v voltage drop
86degF---24,270ohm with 2.26v voltage drop

Check it at work before you leave (this is when it acts up)Coolant should be ambient temp as long as you dont start it up.

[package123]

well i checked that all out i have been between houses and i finally got my tools unpacked anyway everything checked out "A" ok does anyone know if a 2.3 liter will bolt right in i have a 2.5 now with a five speed my buddy has a 2.3 in his truck that he is going to junk and what i am think is to get his motor and put it and the stand and rebuild it from the ground up and then do a transplant his trans is shot it was a 5 speed and so id the trucks computer
( flood) anyway i can get my hands on the motor and i just want to make sure that the thing will bolt up to the tranny and the computer thanks to all again mike

[Hilikus Funkin]

my dad has a 2000 ranger i think with a 2.5 5-speed and it has no power to begin with lol. I used to work at auto zone and they have 2.5L rangers with autos and theyre even slower. But yeah check for fuel problems and vacuum leaks. See if someone you know has an A/F ratio gauge and see if youre running lean.