Join Date: Dec 2001
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Re: New to Jeeps, looking for YJ information.....
I own a 89 Ĺ wrangler. My 4.2 runs great. But it has $hity gas mileage and I only run it on 92 octane. I am not an expert but this is my opinon.
The 89 1/2 up wranglers have the AX15 even with the 4.2. The 4.2 is a great motor. it has a longer stroke then the 4.0. It has more low-end grunt. But, itís worthless over 3k rpm.
Itís carbureted with computer and everyone hates the carb. But there is allot of info on the web on how to make it work. Furthermore, even if the computer is all fowled up, you can still coax the thing to run well enough to get you home. [img]images/icons/smile.gif[/img]Some might argue that is the normal operating state of the engine.[img]images/icons/wink.gif[/img] But, buying a jeep with the 4.0 already in it is probably the cheapest way to go. The 4.2 can be modified with the 4.0 head and the MPI, for around $2000 in parts, so figure that into your cost. Iím still thinking about modifying mine.