I have a 1990 cherokee larado and I have discovered a sensor on the bottom of my block that has been ate up pretty bad from an exhaust manifold crack..I have since replaced my manifold but having a hard time fig what sensor it is.. 1st thought was my ECT but looks nothing like the replacement sensor so thought possible my oil pressure sensor and again does not look like the replacement one.. Any help would be greatly appreciated

 

Possibly a Knock sensor?

http://amzn.to/2dysaim

 

If it is screwed in just above the oil pan, it's a knock sensor.

 

That's not good. An XJ should never peep. I suggest you don't take it out there any more.

 

 

good point as you see a newbie here

 

Thanks you the input @aroundincircles and @crusier54