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Yup That was it. I passed emissions no problem. The new O2 sensor made a huge difference. Kinda makes me mad that the last time I replaced it with a bad one. Thanks for your help.

After doing a little reading it seems that my O2 sensor works the opposite of later models. On later models the sensor has a voltage range of 0 to 1 volts. Higher voltage indicates a rich condition. However the O2 sensor on my 90 has a range of 1-5 volts, higher voltage indicates a lean...

Thanks 5-90. I will try your suggestions this week-end Bajacalal- There does not appear to be any vacuum leaks and the exhaust is new from the cat back. Why does my O2 sensor show 5 volts on the mt2500 scan tool? Is that normal. That has bothered me since I installed it.

From what I understand after reading these forums a Bad EGR would cause the CO reading to be lower not higher. Is that correct? 142.0 CO is extremely rich, it seems unlikely that a bad Cat alone could cause such a high number. Am I mistaken? Here are results of the emissions test Hydrocarbons...

1990 XJ 4.0L I Failed emission last week with 85.2 Carbon Monoxide. It needs to be 20.0 to pass. So we replace the Injectors, Airfilter, Spark Plugs, Distributor(not cap) and oil. All of the above were due or needed. After doing the above I noticed the pedal to be a bit more responsive. I Just...

Let me elaborate. I'm actually less concerned about the capacity as I am about the baffles and trap doors that come with an aftermarket oil pan. These allow for better oil control and keep more oil around the pick-up during extreme maneuvers or harsh angles. In fact I would also like to find a...

Does anyone sell a High capacity oil pan for Jeep 4.0L?

Yah I don't really like the PreRunner style. I like the Guards that extend over the headlights. I really like the looks of the one pictured above. Looks like I will probably buy it and atempt to bend it.

Who is AJ?

All I have seen from FourReal Steel are PreRunner syle brushguards. Nothing similar to the one pictured. The Brushguard by Warn is also nothing like the one pictured.

I just put on My Bushwacker Fender Flares. Now I'm looking for a Winch bumper and Brushguard that will fit my 90 Cherokee. I reallylike the one by Custom 4x4 Fabrication Pictured below. However the brushguard will hit my Bushwackers. Has any successfully modded this brushguard to work with...

Thank you to everyone for replying. I found Brian C. and Eagle's advice to be the most helpful for my situation. It isn't perfect, but it seems to drive ok. I drove it for 70 mi last night without a problem.

I have a 1990 Jeep Cherokee 4wd (3.55). My rear pinion seal started leaking bad last night. So I got a friend to help me replace it. However he did not mark the nut before he removed it. Now we have no idea what the original position of the nut was on the yoke. What do we do? We are doing this...

Idles rough, barely stumbles at high speeds. The stumbling wouldn't be noticed by anyone else but me probably. It's that mild. The primary symptom is the rough idle. By rough idle I dont mean horrible rough, just rougher than it should. I drove another cherokee we had at work for awhile before I...

How often should I pull and clean the IAC? As I said, it made no difference last time I cleaned it. It hasn't gotten any better or worse since then. I seriously doubt cleaning it again will have any different result than last time, as the rough idle was present both before and after the last...

I Did clean the area around the IAC, but that was 3 mos ago. I doubt the occasional high idle trouble is from that cleaning. Is there a safe way to test my coil? Would that cause the rough idle? The main problem that really bugs me is the rough idle. I mention the other things because they may...

1990 Jeep Cherokee 4.0L Automatic Symptoms: Rough Idle Runs strong, doesn't feel like it's missing very slight stumble when mild gas is applied at 30-40mph occasionally stalls(very seldom) when restarted idles at 2000rpm, often very hard to get it to quit. occasionally(very seldom) will idle...

I already found the parts I was looking for, but I might be interested in those gears soon, if you still have them when i get ready.

Can someone point me to detailed instructions on the Proper Throttle Valve(kick down) Cable adjustment. I found where to do it. Just press the button and move the cable. But what is the proper position on the cable at full throttle? I pulled the cable a bit toward the passenger side and the...

What generally causes a sluggish shift? Adjusting the kick down can affect my shift points correct? But can it affect a sluggish gushy shift?