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Old 08-04-2015, 03:49 PM
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Post Purchase Advice: YJ 4.2 or 2.5FI?

Hi all,
Just sold my tired and beat 92 YJ with a 2.5 and now am looking for a replacement YJ. Originally hope to get a 4.0 but they rarely come up for sale around here. The 4.2 YJs are about the same money as the 2.5 YJs. Here's the question...stock 4.2 or stock 2.5FI ? I like the idea of having the six but does the 4.2 do well climbing and such with the carb? Or hold out for the 4.0? Thanks!

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Old 08-04-2015, 03:55 PM   #2

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I would hold out for A 4.0L. The 4.2 is a good motor and has enough power for off road.. but ther 4l to me is just better, more HP no worries on the birds nest of carb hoses and lines.. etc.. but go drive one and see what you think.. its your money get what you like the best.


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Old 08-04-2015, 07:15 PM   #3
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You've had the 2.5, so you know what to expect, a really doggy engine on the freeway. If you were satisfied with the 2.5 I'd go with that again, just because you will be a little more familiar with it. Like 4jeepn said, it's your money, get what pleases you.
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Old 08-04-2015, 08:35 PM   #4
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The 4.2 is a great and tried engine and while I love my carburetor the 4.0 is a much more Daily driver engine. The 4.0 is based off of the 4.2 both are great engines and for a off-road only jeep I'd prefer the 4.2 just because while neither are complicated the 4.2 is simple bare bones easy to work on. For a DD id get a 4.0. If you haven't yet go drive one with the 4.2 and just see how it feels I've had 2 cjs with the 4.2 and they did fine but my tjs 4.0 blows it out of the water
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Old 08-04-2015, 09:37 PM   #5
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Go 4.2. You can add a hei distributor and a decent carb. It'll run great. I went from a 95 YJ with 2.5 to a 89 with 4.2. I installed a hei distributor. Weber 38/38 carb and detours offroad angled carb spacer. I have zero issues on or offroad. It starts and runs just as good as my XJ with 4.0. Some people throw out 125hp but they forget to mention it has 15ftlbs less tq then a 4.0 not to mention its at a lower rpm now the pre Chrysler 4.2's had 145hp 235tq. So a decent carb and hei distributor will get you back to those numbers. And all I do is rockcrawling I've had no issues in fact my YJ turns my 35's better then my XJ did.
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