Easye1986

I picked up my 2000 xj a few days ago. It had been sitting for almost a year and a half. Interior is extremely clean and the exterior is except for a dent on the pass. side rear quarter. Here are my list of problems.

Aux fan not working. Jumped it and the fan is good just doesn't kick on

Sometimes the overdrive doesn't kick in. Read something about cleaning the nss but not sure were to start on that or how to clean it. Also reverse lights don't come on

Have a multiple miss fire on cylinder #3. Changed plugs but it still idles rough. Smooths out when you give it a little throttle. Thought maybe the coil pack for 3 might be bad but figured since it shared with another cylinder it would case that cylinder to misfire aswell.

also showed codes for both o2 sensors but that a given


Any help is greatly appreciated

jakecarder

I habe a 2000 so i know a few things. Also my 4th jeep. First things first is to revamp the entire cooling system. New thermostat and water pump. Un hook everything and flush the heater core, engine, and by itself. 00 and 01's cylinder heads crack more often then not. That could be your problem with the misfire as it cracks at that cylinder. Search 0331 head crack and do a lot of searching. Sometimes if its bad enough you can use a flashlight and look in the oil fill hole and see it weeping out. Next new oil. How does it look. If your head is cracked, antifreeze leaks into oil and ruins bearing, ultimately needs a motor swap of not caught soon enough. The oil will look frothy amd leave a milky residue on the oil filler cap. What's the oil pressure look like. Check the fuses for the fan. See if you have power to the fan. How do you know its not working. Are you over heating? Should be able to turn the ac on and it will come on. Look that up to be sure. Over heating the 00 4.0 will crack the 0331 head like stated before. You could swap the number three injector around with another, clear codes and see if it follows. Also when do spark plugs its best to do all 6 and only use champion spark plugs. Beat price is online but can be had re branded at the jeep dealer for a couple pennys more. Also look up the o2 sensors. I forget what brand and part numbers(I believe bosch brand are the ones) but it won't run right with cheap autozone/advance auto ones. There's 3

jakecarder

I don't know everything about the overdrive but I dknt think the nss has anything to do with that. There's sensors or relays or something inside the tranny. Requires dropping the tranny pan to get to. Research those to see if that could be the cause. There not expencive.....hope this gives you an idea on what to check and and place to start. Remember, baby that cooling system or it will ruin you day, if its not already. Its quite common. Welcome to the forum and jeep world, keep us updated on your progress and to help future people searching your same symptoms. Also search cause what you posted all has been answered twice a month for the last 6 years lol

Easye1986

This is my 3rd xj but both others were earlier models. Motor is jasper crate engine with under 15k . No milky oil or anything like that. Good oil pressure. The head isn't the problem. Fan doesn't come on with the ac. Swapped the relay with a new and still nothingPlugs have been changed like stated above.

DFlintstone

I have plenty to learn about your year, but I have a couple things. The E-Fan doesn't come on till about 218*. A bit tough to test. Up till 90, and maybe 96 it will come on on defrost or when the AC is on. Yours may well be different.

For some reason my reverse light bulbs go often, maybe check...Yes, the NSS does control them, but not the shifting. TPS? Anyway thers a thing on the NSS> http://go.jeep-xj.info/HowtoNSSrebuild.htm


http://bc4x4.com/tech/2010/jeep-neut...ty-switch-nss/


If you post your exact codes there are some guys here who are pretty sharp that might be helpful. If you fill out your info they won't need to search around to find out what you have!

Easye1986

I read it wasn't supposed to come on till 218 but thought it would still come on with the A/C on. Just want to make sure everything is working properly to prevent any problems in the future.

Easye1986

Ill check my bulbs before I pull the nss apart. Ill clear the codes and see what comes back and go from there

DFlintstone

I'm no authority...Does your AC work OK? It might be it needs to have some certain pressure to make the fan come on....(smart arsed 2000) I'll take a 90, thanks.

You might be able to just adjust your NSS. One "procedure" I read was to mess with it till the lights work, and it starts in P & N.

Easye1986

A/C doesn't blow cold. I asked a tech if it needed to be charged in order for it to activate and he told me no. Ill try and get it charged and see if that makes a difference.

jakecarder

No my ac hasn't work for years. But my fan does come on when its hot.

PocketsEmpty

He is wrong. The A/C system has a low pressure safety switch that will not engage the compressor when the refrigerant is too low. The E-Fan will come on with A/C engaged, but only if the refrigerant is good. Also, the blower motor still works, which is why the air is blowing but not cold.

Easye1986

Here are the codes
p0132 bank 1 sensor 1
p0138 bank 1 sensor 2
p1491 radiator fan relay
p0303 misfire cylinder #3
Their was also a code for the trans but I didn't get the trouble code. It was something about the range selector.

Also I replaced the fan relay but didn't get a chance to reset the codes to see if it came back

Easye1986

Ok the fan relay code is still there even after I replaced the relay I checked all the PDC fuses and everything was good. Any other ideas?

DFlintstone

I think range sensor is the NSS.

Easye1986

I took it apart and cleaned it. It really didn't need it. All contacts were clean and the spring loaded contacts were working as should, but I removed and cleaned everything any ways and put new die electric grease on everything. I noticed the od works every other key cycle. If it doesn't worki can pull over kill it and restart and it works. If I kill it again and restart it won't go into od.