Thinking of doing the 4.0L HO Engine Change on my CJ7, Good? Pro / Cons? - Page 2 -
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post #16 of 17 Old 02-16-2013, 09:01 AM
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2003 TJ Wrangler 
Join Date: Dec 2008
Location: Camp Pendleton
Posts: 463
Originally Posted by aggiejon View Post
Sarge, you mentioned living in Tx. Where at? I like your plan for the stroked 4.0. I considered it with mine, but needed to get it back on the road and I knew the bottom end of the 258 was solid and sound, so I let that dog lie.

I am no expert on the efi by any stretch, but if you get into it and have questions, give me a shout. I took the wiring diagram and Pinout diagram for the donor harness and removed everything that I couldn't use for my jeep. Cherokees have lots more systems than cjs. But I did gain several relay circuits in the PDC. And the harness became much lighter quick.

Largest word of caution...I cobbled mine together from parts that I bought cheap from several sources, such as a complete siezed 4.0 motor from a 2001. That yielded a very desirable intake design. However, the throttle body was different from the 93 Engine harness, so it was swapped for a 93. Many of the sensors from 92-2001 look the same on the business end, but the plugs changed quite a bit. I still have a box full of sensors that were either from the 01 motor or picked at the junkyard. Take home message, get on Craigslist and buy a wrecked and running jeep w a 4.0 and strip it. Part it out or else roll it across the scales for $11/cwt.
I don't actually live in TX, but my in-laws do, up in Allen. My CJ is patiently awaiting my return from Okinawa in Alpine, TX courtesy of BioTex (another JF member). Take a look at the CJ Express thread in my sig to see how it ended up there!

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post #17 of 17 Old 04-08-2013, 11:55 AM
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1980 CJ5 
Join Date: Mar 2013
Location: Mechanic Falls
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I hope it's okay to tag along with an existing thread. I've got a 1980 CJ5 with the low compression version of the 258 (with a single barrel carb). I don't know if it was a special order or what, but the VIN confirms the odd engine code (B). I could pick up a Jeep Cherokee Laredo with the 4.0L HO engine for $200. I'd be able to take anything from the Cherokee that I want. From the earlier posts it sounds like I could swap the entire motor or just the head and manifolds if I wanted. I assume that for $200 I've got a great deal in front of me, the catch it I don't have a lot of time to do research before deciding. I need to pull the trigger on buying the junk Laredo quickly.

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