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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...

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

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...

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...

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 just converted my 2wd 1990 Jeep Cherokee 4.0L to 4wd. This included changing the transmission. It is still a AW4, I just swapped it for one out of a 4wd XJ. Since I changed transmissions I have noticed a significant loss of performance. It seems to have a slow mushy shift. It's not very...

I have a 90 Cherokee 4.0L Automatic What can you tell me about the Fuel injectors? What are they rated?

I needs Parts to convert my 90 Cherokee 4.0L 2wd Automatic to 4wd. Preferably in Arizona. Will purchase entire Parts car for the right price.

Sorry I'm a noob. I have a 1990 Jeep Cherokee Laredo 4.0L Automatic transmission 2wd. I want to convert it to 4wd Automatic trans. First I need to know what Parts I currently have and what parts I need to replace and what to replace it with. For example will I have to replace my trans? If so...

Where are the best stores to find and buy XJ stuff online? Especially Brush Guards Racks and Armor?

I just bought a new TPS for my 1990 Cherokee 4.0L Automatic. I have the multimeter instructions, however after reading the following I'm a bit concerned. Adjusting TPS lessons In this thread he says He basicly says that when he re-checked TPS's that were set using the multimeter method...

I have a 1990 Cherokee 4.0L Automatic I know the TPS is on the throttle body, but where? THere are two things on the Trottle with wires coming out. Is it one of those and if so which one? Also where's the IAC. Sorry bout the noob questions.

Nearly any condition. Must have good 4x4 drivetrain and rebuildable 4.0 engine. I don't have a great deal to spend, but I will take the whole wreck off your hands just to get the parts I need.

Sorry if this is the wrong topic for this post. I just got my first Jeep and have big plans for it. It runs strong, but idles a bit rough and even stalls sometimes with the AC on. I replaced the ERG valve and plugs and wires. But still have the same problem. I have attempted to retrieve the...