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I can see why you would want to do this. I bought a Wrangler with the fuel injected 4.0L for a reason. I used to own an old CJ with the 4 cyl & it was very weak. As for how difficult, it has many considerations some of which include your wrench skill. I know the motor mounts will need to be moved so there is some welding skills. Also the 4 cyl might have a different trans & the 6 cyl has to mate up to the existing stuff in your Jeep. It cna be done, but I suggest checking some of the Jeep blogs & look for someone who has done it. They are very willing to share info in most cases.

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Q: You want to convert mt 2.5 4cyl 94jeep wrangler to a 4.0 6cyl what do you needand how difficult?
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When attempting to unlock the drivers door the alarm goes off you can only unlock the passenger side manually unlocking it from the inside of the passenger door how can I fix this 94jeep grand cheroke?

were is the factory theft security system located in a 94 jeep grand Cherokee limited Actually ... if you lock the door manually then to unlock it and not have the alarm go off you need to do 1 of 2 things, manually unlock the hatch or passengers door, or use the keyless entry. The security module is behind the dash just to the left of the glove box. You have to pull off the right side dash, glove box, etc. to get to it. there is two modules behind there, the security module is the one on the left side. vjs The drivers side switch mounted on the back of the lock mechanism wears out after ten years because it is used the most. This is why unlocking the vehical from the passenger side and the hatch works to disable the alarm, they are not worn out yet. you can replace the drivers side switch. vjs You can pull the security module out, the alarm is disabled then, but you also lose your automatic locks, you have to lock and unlock manually. If you pull the module out, you have to do it with the engine running. vjs You can ground the violet wire going to the switch in either door or hatch ground it to the body, this will disable the alarm as well, but if you are going to the trouble, and want the alarm to work, replace the switch. vjs Sounds like you have another problem with your passenger door, not sure i understand your description of your problem. there are a set of relays in and under your glove box, that may affect your problem with your passenger door, these are part of the automatic door locks, these modules are the ones that stop working when you pull the module out. vjs You can pull the module, re-route the connector under the dash then you can plug it in and out without taking the dash apart. vjs COMMENT>>> the above answer is spot on. Even the reason why it happens is 100%. I wish EVERYONE knew their stuff as well! AS for your passenger door lock, is it the keylock itself that doesnt work? If not it still should work to disable the security system unless the system has worse problems than typical. If it is just that the jey doesnt work in it it is easily removed from inside the door panel and the local locksmith should be able to fix it less expensively than a Jeep dealer can (have you tried Lock Ease in it yet?)