I have a 1998 Xj sport 4.0 aw4 and when I drive though slush it loses power and starts popping from under the hood. If I stomp on it, it stops until I let off, if I let it do it, it slows down to about 10mph and pops bad. Obviously staying on the gas isn't an option in the slush because ill end up in the ditch. What do you guys think my problem is? It does something similar while warming up but goes away as soon as It gets to operating temps

 

Is there a way to remove the nut attached to the power steering pump for the pressure line without removing the serpentine belt and or power steering reservoir?

 

Up until yesterday, My 1991 Cherokee Sport 2WD 4.0 automatic has ran flawless. No mods, box stock. Plenty of fuel in the tank, and it was as if I reached down and just turned off the engine. Was doing about 25 mph, and was about 5 miles into my drive. Pulled to the side, fired right back up and proceeded to park. A 2 mile journey after that rendered no stalls. Little time had past, and I took another 5 mile or so trek only to have this happen again. This time it took a little loner to get it started. Drove it home without incident (2 miles) and parked it. There's no forewarning of these stalls such as sluggish acceleration, hesitation, etc, which seems to rule out fuel starvation. Just cuts out! Coil wires appear to be in good shape although while I had the hood up and engine idling, I heard what sounded like an arcing sound twice within about 10 minutes of idling. Engine ran smooth the entire time. Some say mass air sensor, while others say crank positioning sensor, and to also check the plug in to the computer module for corrosion. Trial, and error equals $$$$$ which I'm short of due to the 15 mpg this puppy gets. I love my Jeep. Can any of you veterans give my some good advice? Yes, I'm new here, and have faith in these forums. Thank you in advance. JT

 

You're wanting to remove the pressure valve or the line?

The big nut that the line threads in to is the pressure valve. 9 times out of 10 when you try to break the line loose from the pressure valve it breaks loose in the pump first so you have to pull the pulley to get a wrench on it.

If you try to wedge a wrench down in there you're going to bend the pulley and have to replace it anyway. Don't ask me how I know...

 

Pretty typical of the Crankshaft Position Sensor going out. I'd encourage you to rule out problems with the ignition coil and ASD relay first. Coil can be tested with a multimeter, there are instructions around here somewhere, and ASD relay you could swap with another one in the power block under the hood.

Cleaning up all of the wires and connectors for corrosion and shorts is an excellent starting point. You can solve and prevent a LOT of issues this way. This thread has a few sections on doing just that, and while it's written for XJs 87-90 a lot of the same applies to later models: https://www.cherokeeforum.com/f51/cr...x-tips-153657/

If, after doing all that work and testing, you rule out problems with those, don't bother trying to get a Crankshaft Position Sensor (CKP or CPS) from cheap parts stores. A proper Mopar one from the dealership is really the only reliable option. Many people have had like 4 DOAs in a row from Autozone.

 

The line. Thought i had to undo the pressure valve to get the line out not realizing I can just unscrew the line from the pressure valve (doh!)
When unscrewing the pressure line from the bottom I saw one person use a "crows foot" style wrench to get it loose. My normal open end wrenchs didnt have much effect on the bottom one

 

What's the paint code on this Jeep in the junk yard? Also is it the same color as my Jeep?

 

Top looks like Slate Grey. Bottom is Patriot Blue Metallic.
Definitely not the same.

 

Where can I find some California legal replacement pre cats for my '00 xj ??? Can't seem to find a decent price. Bank two keeps throwing a catalyst efficiency code.

 

I believe walker makes a good cheap replacement. Like 2 something.

 

I really need an advice about my exhaust system. When I bought my Jeep and looked under it, it was normal. A cat(which I thought it was a cat) and a muffler. Then I installed Flowmaster delta flow 40 series muffler. And yesterday I realised that the thing that I thought cat was another muffler. I didn't have any knowledge about mufflers and cats until I bought my flowmaster one month ago, but when I learned about them a little, I noticed this weirdness. I think the former owner had his own reasons to do that.

So my question is, should I remove this muffler? I will change it with a high-flow cat as soon as possible, but until then I really wouldn't say no to a louder exhaust, since delta flows are very quiet .

 

They're all 49 state carb, I can't "use" them in CA.

 

Might be able to knock the guts out of the pre muffler

 

Hmmm, i forgot what made California cats different. I thought cali emissions vehicles had 4 o2 sensors??? I can't remember now.

 

What year did you say you have.