Convert 88 XJ to Carb?

I think I saw a TBI system once for the 4.0 that used standard GM parts out there back when I owned one....might wanna do a google for replacement EFI systems for jeeps...

 What is the big problem you are having with the system? The Renix wasn't a total POS and actually usually works fairly well. They didn't have the self-diagnostic capability the Chrysler system had, but overall performed as well in my experience with them.  

Edited by randyscycle - 05 Feb. 2010 at 3:24am

I guess you could say that the biggest problem is a total lack of confidence. You never know what it's going to come up with next. It will run fine for several weeks, then-- who knows? During my commute to/from work (16 miles each way) it may "stumble"-- like someone turned the switch off&back on very quickly. Might do this once, or 2-3 times. Might do it tomorrow, maybe not.  One morning it refused to fire- cranked great, but no start. Had to drive my pickup (70 Chevy w/ Q-jet & HEI. I'd trust it anywhere) to work 3 days. Saturday morn, gonna diagnose the XJ, still no start. Hooked-up the ol' fuel pressure guage, good fuel pressure & still no start. Pulled #1 plug wire & connected spark tester, and it fired right up! Ran on 5. Good for a long time after that. Sometimes when I start it up, it'll go to 2000 RPM's or so, maybe just up & back down to idle, maybe it'll hold at 2000 for several seconds, maybe as many as 15-20. Sometimes it doesn't slow down at all, I have to shut it off & re-start. Might be fine, maybe not. I really hate that, when I was a kid, we used to laugh at old people who would rev their motor at start-up because they couldn't hear it run. I'm close to 60, and that embarrasses the hell out of me.  And, when I go to the parts store, 88, 89, & 90 Cherokees with 4.0 don't exist. It's harder to find parts for than the Flatfender's. Yeah, I know about the bad grounds, the dirty connections, Bubba, and what have you, I was there for the introduction of HEI and then TBI and TPI. And diagnosis? How? There's no access to the system, and no specs. And as we all know, it's hard to diagnose anything that's working right at the time. I just want a system that starts & runs every time, with predictable characteristics, that I can diagnose if need be, and get parts for. Maybe it's just me-- probably my dislike for anything French comes from the time in the mid- 70's when I worked at an AMC dealership-- we also had Renault.  BW

Yeah, the ONLY time it quit and stayed down, that was it. That's one thing that seems to be constant with all the manufacturers-- it's as if they don't WANT you to change a crank sensor, they all put them in an almost inaccessable location.  BW

How about a 91 or newer 4 liter  head swap with Chrysler MPI?

My Jeep Buddy recommends buying a XJ with the HO 4 liter that is wrecked, not running, needs tranny or otherwise cheap.  Then swap out what you need, sell what you can and junk the rest.