Question about 1993 Jeep Wrangler

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How do you change the exhaust manifold on a 93 Jeep Wrangler?

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If it's a 4.0 the intake and exhaust both need to be removed. It's a simple unbolt and put back on. make sure you write down and mark any sensor wires and cables, so you can put them back on properly. If you are really unsure of yourself, get a chiltons or haynes manual or have a shop do the work for you. Torque setting on all bolts is 24foot pounds except the first one closest to the front, and the same one closest to the rear which are both 17 lbs.

Posted on Sep 30, 2009

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1 Answer

How to replace exhaust donut on 99 wrangler


This is pretty straight forward, you need to locate the exhaust manifold and follow it down to where it connect to the exhaust pipe, there three bolts on the joint and you take those out. Then see if you can separate the pipe from the manifold. If you cannot separate them then you need to get under the jeep and loosen the holders for the exhaust pipe. When you can separate the joint, take the old doughnut out and put in the new one. Make sure that you get it tight and that you tighten the bolts evenly. Don't over tighten one side.

Feb 18, 2015 | 1999 Jeep Wrangler

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2001 jeep wrangler 4.0 new motor new intake new ecm and when you start it the motor instantly goes to 3000 + rpms. what will cause this???


There is a vacuum leak from installing the intake. Common problem. The exhaust and intake use a common gasket. When reinstalling the exhaust manifold, there are two guide pins, one front of the manifold and one in the rear. What usually happens is that the manifold sits ON these pins when installed and it creates a vacuum leak when the engine is started that instantly races the engine. The manifold has to be removed and when reinstalled, MAKE SURE the pins are IN the guideholes on the manifold.

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I would have the exhaust manifold inspected, a lot of times it cracks where the pipes connect. I am assuming you have a 4.0L. Then you would just need to change the manifold to fix the problem.
Thank you,
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Feb 13, 2011 | 1992 Jeep Wrangler

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My 1999 Jeep Wrangler keeps cracking the exhaust manifold. Is there a fix ?


The best fix is to install the two piece OEM manifold from the later model (2000's) wranglers. There are also manifolds with accordian type flex joints for sale on line that will last MUCH longer than the one piece OEM manifolds.

Oct 22, 2010 | 1999 Jeep Wrangler

1 Answer

Replaced exhaust manifold on 99 jeep wrangler. turned ignition to start up and engine screams in full throttle, what could be the problem: vacuum, sensor???


The intake manifold is the common culprit for this. It may look like it is flush to the block, but it isnt and is causing a huge vaccum leak. There are two locating dowel pins that the manifold must be flush on before tightning the bolts. The usual problem is that the manifold is resting on top of these pins instead of flush, causing a gap. You have to unbolt the intake and exhaust manifolds, relocate the intake and replace the bolts.

Oct 19, 2010 | 1999 Jeep Wrangler

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I also have an '89 Wrangler with a 4.2 liter inline six. I'm afraid that the spark plugs aren't on the same side as the manifolds. Mine is being a pain in the *** for me. The intake is lining up fine but the exhaust is off by about 1/4 of an inch in the way of a bolt. Was hoping for some solutions, left disappointed.

Apr 26, 2010 | 1989 Jeep Wrangler

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Changed exhaust manifold and now it redlines at start


you have a serious vacuum leak or you bent something on the throttle linkage.

Apr 04, 2009 | 1999 Jeep Wrangler

1 Answer

I have a hole in my exhaust manifold


A little bit of work is involved here. Don't attempt unless you have quite an assortment of tools. A lot has to come off to complete this repair. You need to be a better than a beginner mechanic to do this.

Feb 26, 2009 | 2004 Jeep Wrangler

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Exhaust Manifold


Not familar with the jeeps, does the EGR tube run into the mainfold its self?

Oct 22, 2008 | 1997 Jeep Tj

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Jeep Wrangler Gas Consumption and Loss Of Power


If its using a lot more fuel than usual its almost garaunteed an 02 Sensor. Those are located on the Exhaust Manifold's, are about the size of your thumb, and generally have 2, or 3 wires coming from them. If you can, check them for operation before you replace them as sometimes they're kindof expensive.

May 16, 2008 | 1999 Jeep Wrangler

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