i have a 92 cherokee limited 4.0 engine. it has a temp sensor near the back drivers side next to the valve cover...( i'm guessing that what it is)... i am replacing the engine with a 98 4.0 but it does not have that sensor... is that going to be a big issue for me?? i;m new to the jeep world so i am really lost....

 

That's the temperature sender for the dash gauge

 

U'll have to drill/tap a new hole in the '98 head for the '92 sending unit.

 

Why not a T fitting on the thermostat housing? Lots easier.

 

Easier, it in my experience not as accurate, I put a 99 in my 90, I just drilled and tapped for the dash sender, reads nicely and I know the ecu temp sensor is reading a more accurate number

 

Exactly.

 

So you're saying the pcm doesn't receive accurate temperature information from the sensor located in the water outlet, really? If the OP doesn't currently have a drill & tap (assuming they already own a drill of course) thats another what $30? What if they wreck the cylinder head in the process?

 

I believe that's exactly what he is saying. The tips of both the temp sending unit and the coolant temp sensor should be located directly in/surrounded by flowing coolant for the most accurate readings. If the head is not drilled/tapped, the temp gauge sending unit wire could be lengthened and the sending unit re-located to the heater hose close to the t-stat cover. Heater hose mount would also require drill/tap. That way the tips of both the sending unit and sensor would be located in flowing coolant.

 

OleBlue posted this pic



in this thread:
https://www.cherokeeforum.com/f2/new...nt-fit-176254/

 

I wouldn't do that.

 

No, not the cylinder head. Tap the tstat housing for the dash, and it already should have the ecu sensor tap

 

In looking at that pic, how does coolant flow/move around the business end of either the sending unit and/or sensor? How is air not trapped around the business end of the sending unit and/or sensor?

If the t-stat cover is drilled/tapped for sending unit, the wire will need to be extended AND caution must be used to keep the wire out of the rad fan.

 

will it throw a code if i dont have that sensor hooked up right away? i have to go through DEQ.... btw... thanks for the help from everyone... i really do appreciate it....

 

Electrically, u have them hooked up the right way.....it's just that, well u know.