KJ/3.7L sensor ID help needed

[mjeff87]

Finally got under the KJ to diagnose the PITA drip/leak it has.  Thought it was in the trans, but turns out its on the block.  Theres a sensor of some kind, I thought it might be the CPS but after googling a bit I don't think it is....its on the passenger side rear of the block, down low, almost where the block mates to the BH.  Its got a pigtail coming off of it.  Anyone know what it is?  The sensor works fine (whatever it does) but I'm guessing the oring that seals is has gone bad.  I can't see it leaking, but its obvious thats where my leak is coming from.  Completely dry above it, but shiny/glossy all around it and below it.

 

edit:  it is DIRECTLY behind the passenger side cat converter....whatever it is, its going to be a real treat to swap out.  Thanks, Daimler Chrysler.

 

[Pete M]

photo?

[JustEmptyEveryPocket]

diyalldata.com

 

Seems to be great for diagram information and shop time estimates. Fairly low rate for the amount of material I have received on other vehicles. Maybe it would help?

[mjeff87]

Thanks.  I took it to my buddy's house, who has a huge (like 50x100, 4 bay) garage so I could get it way up in the air so I could get underneath it without a tranny pan in my face and dig around.  Didn't even think to get a pic.

 

Ima do some more goggling tonight...

 

I have the full 3.7 engine manual (90 some pages, i used it extensively when i pulled the head) but it doesn't mention this sensor.

[mjeff87]

Pretty much confirmed that it's the CPS after a couple more vidjeos on boobtube.  I'm going to run down to the junkyard a bit later today and figure out how to get it out.  Ill use the oring on it to match up a new one for mine.  Worst case is I break mine getting it out and ill have a spare so I won't be stranded.

[mjeff87]

Screw it, bought a ching-chong replacement sensor (car quest brand) from AA today.  Cashed in a bunch of speed perks rewards i had built up, only paid $16 for it.  Ill swap it in tomorrow, then get a new o-ring for the OEM one and keep it as a spare.

[Pete M]

sometimes ya just gotta bite the bullet and go with what's available  

[mjeff87]

Yeah....that 21 year old OEM sensor is straight up welded to the block.  I got it to rotate about 120 degrees after copious amounts of PB and time. I finally threw in the towel and tightened it back up, for fear of snapping it off and/or the guts falling into the oil pan.  I'm gonna drive it a few days and let the PB work its magic and try again over the weekend.  What a saga.

[mjeff87]

[Pete M]

does it thread out?  or is in more pressed in?

[mjeff87]

Its a press fit into a machined hole in the side of the block, with an o-ring midsection that seals it.  There's a bolt that holds it snug (you can see it in the pic).  I got the bolt out, which was a treat in itself due to the cramped quarters, and thought I had it in the bag from there.  How wrong I was.  I'm pretty sure that the half can of PB I doused it with will work its magic given  couple days...ill give it another shot this weekend.

 

Wife came home and I bagged it for today, we went out to a local place for dinner that has a few different beers on tap.  Lol.

[Pete M]

I imagine you can find something good with all that choice.  

 

there's a place near me that has 2-3 times that on tap.  it's nuts.

[mjeff87]

Victory is mine.....gotta love PB Blaster and a few days of soak time.  Popped right out.  Now ill take the factory/original one and source a new oring for it and keep it as a spare.

[Pete M]

[mjeff87]

After the last escapade with snapping off the spark plug in the head, I was NOT going to rush this repair.  Lol.