Join Date: Aug 2000
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Re: 2.5 to 4.2 swap
This swap seems backwards, most people go from carb to fuel injected, this swap will give you some problems, Well I havn't done the swap but you are going from something that never really has problems that is something that is swarn at. You will probably pretty much throw away your computer, and you will endup with a computer controled carb on the 258 that is probably one of the most hated carbs, you can make the 258 a nice engine but it takes some work, first the stock carb has to go consider swapping in a mc 2100, quadrajet, or an aftermarket fuel injection such as the one by mopar. Then the igintion system needs to be changed, the techonolygy that's in the current distributor is from ww1, search for igniton upgrades on this board. Also the emissions system on the engine is considered a nightmear, that's why most people swap in a different carb that doesn't rely on miles of vaccume lines and then just run a couple other vaccum lines, usually this help with the engines performance, if you like to tinker and experiment this might be a good swap, other wise wait till you can get your hands on a 4.0
'95 YJ Totaled!
Now All I have is an insurance Claim