I have a 89 jeep cherokee 4.0 auto and getting a nice crack by the o2 sensers and I,m stalling sometimes when I slow down or put it in park,starts again OK,I have to keep the rpm,s up when I come to red lights etc.It did it once and awhile but now is getting worse.Truck has been fine until now

 

Prolly not the cause in this case. My 87 ran for several months without an oxygen sensor.

Its probably either the TPS or IAC.

 

the TPS is acouple yrs old,but that doesn,t mean anything but what is IAC and where is it

 

IAC = Idle Air Control Valve/Motor

Its located on the throttle body. Attached image.

 

That thing,I keep cleaning it to help with eratic choke idle

 

the cps is what caused my xj to stall
if it cranks but doesn't start when hot after a stall but does after it cools down, that would be cps.
if your ever in an intersection and it stalls and you cant get it started, a trick I found out is to unlplug cps, turn over the vehicle(it 100%wont start with it unconnected) then plug it back in and turn the key. mine would always start after that.

 

There are plenty of things that will cause a hot-no-start.

A bad coil will do the same. As well as a fuel pump.

Don't ever just ASSUME you know whats causing the issue and throw parts at it. Do the diagnosis first to confirm, then buy parts. Otherwise you run a good risk of wasting money.

From my experience a crank position sensor will just cause a no-start all of the sudden. They dont get "weak" and work intermittently.

 

yeah makes sense, I didn't know those other things could cause that but my cps wire got burnt to death by my header so I kinda new it was that. but mine would get hot and stall but always start when cold haha
so to the OP take his advice not mine

 

LOLOL!!!!

HAHAHA, my cps wire got cooked as well!! Thats awesome!!

I went out one day to drive it and it would just crank away. I looked at the wire, burned to a crisp!

 

HAHAHA that's funny man, Im glad I wasn't the only one! its zip tied as far away from those headers as possible now lol

 

Here's how it's supposed to be routed. OP click on the "pink link" in my signature and do the procedures outlined in posts #1, 2, 3, and 7.

 

thanks cruiser

 

I spend almost 1300 trying to fix a stalling issue , it was the crank sensor , I bought one at auto zone stalling issue still was present until I got a crank sensor used from another cherokee now works perfect !!!! check all cables going to the crank sensor , clean conectors with electronic cleaner if u do replace the crank make sure its the original if not ull be wasting money and time