i need the engine size in order to answer your question, since this car come with, 1.8 1.9 2.0 and 2.8 engines on it please tell me wich one you have and we go from there
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is it a single coil or a coil pack with all plug wires going to it..if its a coil pack its bad and the new one is no good ,that does happen alot more than u might think. i had a brand new MSD box bad from factory. and that was like 200 bucks so you never know. they have tests that u can do on the coil also to c if that is problem let me know if u want to go that way and i can help also
TO REPLACE SPARK PLUGS YOU REMOVE COIL PACK MOUNTING BOLTS THEN REMOVE THE COIL PACK WITH BOOT OVER THE SPARK PLUG.YOU HAVE 6 INDIVIDUAL COIL PACK TO EACH CYLINDER. YOU NEED A 3/8 RATCHET WRENCH - LONG 3/8 EXTENSION -SPARK PLUG SOCKET - SPARK PLUG GAUGE.AND TORQUE WRENCH.THE 2000 MODEL JEEPS FUEL FILTER INSIDE THE TANK.1993 - 1996 MODEL JEEPS FUEL FILTER LOCATED LEFT SIDE OF THE VECHICLE NEAR THE FUEL TANK.
I would lean toward a dead coil pack or a dead plug, there is no way to test the coil pack other than removing it and keep the wires plugged in and install spark plugs in the grommet cavities of the coil pack and check for spark across all cylinders( assuming its a 4.0L)
replace the coil pack... to confirm this pull spark plug leads off the coil pack one at a time.... note whether the idle changes. the spark will actually arc and you can hear it. if one of the plugs does not have this arcing... the coil pack is at fault.
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I believe that year had distributorless ignition, instead it uses a form of coil on plug ignition system.
If you open the hood, stand at the front of the vehicle. Look to the left side of the engine, around the bottom of the valve cover (The valve cover is where the oil fill cap is. The oil fill cap is on top of the valve cover), at the bottom of the valve cover on the left side you will see a series of humps. Those series of humps is the coil packs, the coil packs are all in one long piece held down by three or four bolts.
Take out those bolts, gently pry up at the ends of the coil pack and it will eventually come out. You'll see on the bottom side the spark plug boots are attached to the coil pack. After you get the ignition coil pack off, you will see the spark plugs under where the coil pack came from, the boots on the coil pack sit directly on the spark plugs.
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