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New MJ Owner: Tons of questions


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I just bought a 89 MJ about a week ago. Its my first Comanche, and in fact its my first Jeep. Suffice to say, I am already madly in love. However, I have several small projects I want to get done to get this Jeep back to decent running condition. These are the most pressing issues I am having right now:

 

1. The engine idles pretty hard. I scrubbed out the intake manifold yesterday, which helped a lot but didn't solve the problem completely. I have plans to clean out the IAC and EGR valves, but I'm not sure which one is the IAC, and I can't find a way to get to the EGR. Anybody have any suggestions? And, once those two things are clean, is there anything else I should scrub out? I am by no means "tech savy", I can only do fairly simple work such as the intake manifold and things of that nature.

 

2. My swaybar (where the bolt holds the two pieces together) is rubbing on the suspension spring on the driver side. Every time I hit even a slight bump, there is a loud bang from the spring compressing on my sway bar. The previous owner put 31x10.5 tires on this truck, and gave the front a 3" lift, could that be whats causing the problem? He also smashed into something which pushed the front bumper in about 2 inches, do you think he damaged the sway bar? In a potentially related problem, I have almost no right turn radius. I can only turn the wheel about 3/4 of a turn to the right before it starts grinding on something.

 

Thanks for you help,

Tim

 

 

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When you say idles pretty hard, do you mean idles high or revs when it idles? Check to make sure there are no vacuum leaks anywhere as the vacuum lines like to rot away over time.

 

There's a lot of empty space behind the bumper and the sway bar is offset farther back than that so I doubt the sway bar was damaged (atleast from the pic it looks like whatever he hit hit the front and didn't go under). The sway bar links are hitting the springs because they're too short. You can either get a set of extended sway bar links for the 3" lift or get a set from the rear of an F250 (hopefully someone else can chime in on the years). When you slap on the longer links, it'll move the sway bar up and away from the springs. For the turning issue, have a buddy turn the wheel and look underneath to see if the wheels are hitting anything. It kinda sounds like the tire is hitting the lower control arms. If that's the issue, modifying a set of WJ arms or getting a new set of rims with a different backspacing will solve that issue.

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I would look at your drivers side swaybar bushing/clamp. if that's not shoved back, you have bigger problems than you think! With that 3 inch lift, is it running factory control arms? (Stamped sheet metal, not tube steel) If it is, the lift should be pulling the spring away from the swaybar, so something is definitely bent!

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Thanks for the welcome.

 

I will try and take pictures of the sway bar to show what I am talking about, maybe more detailed photos will let you guys get a better idea of what I can do, as I literally have no idea where to start.

 

As far as the idling issue, the truck will idle normally for between 2-5 seconds, then it feels like the RPM drops for between 1-2 seconds and the truck shakes a bit. Then it idles normally for another 2-5 seconds, then shakes slightly for 1-2 seconds. Cleaning the intake manifold (which was pitch black and had about 1/4 inch of gunk built up around the butterfly valve) made the shaking MUCH softer and cut the time it shook by about half. But, it still doesn't feel quite right.

 

 

I'll get some more pictures of my wheel well put up within the hour.

 

Thanks,

Tim

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I appologize that the pictures are not high quality, the camera in my phone is the only one I have.

 

Here's showing where the swaybar contacts the spring:

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Here is from behind the spring towards the swaybar:

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Here is from the front left bumper towards the spring:

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Here is from the front of the truck:

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That would be a stock 2wd front axle.

 

Looks like new lower control arms were put on with the lift, which is good. The axle looks pretty well centered based on where the sway bar links sit compared to the springs. Your best bet would be to get longer sway bar links for the 3" lift. No matter what Cherokee I see, they always seem to hit the drivers side sway bar against the coil when longer links aren't put on.

 

Check and clean the IAC motor for the revving issue. The IAC is located on the throttle body, on the front of the throttle body to the left of the TPS. A great site for diagnosing just about any sensor on the RENIX motors that I've used a few times. http://www.lunghd.com/Tech_Articles/Engine/Basic_Sensors_Diagnostics.htm

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Look to see if the frame rail where your bumper and steering box mounts is pushed back. The drivers side looks like it is pushed back compared to the passenger side.

 

x2. you need new sway bar links.

 

i can send you a pic off extra ones i have.

 

yours look bent.

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Can anybody direct me to a website that sells the swaybar links that I need? About how much do they run, and are they simple to replace myself? Or am I going to need a lift or something?

 

Thanks,

Tim

 

As far as replacing then it should be very easy. I replaced mine when I installed my new springs. Just remove the top nut from the link, then remove the bottom one (I had to use a pipe wrench on the head of the bottom bolt to get the rust broken off.)

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