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The block will work but the sensors are different and you might have to switch over distributors,the Renix control system the 89 has in not compatible Sent from my SM-G935V using Jeepz.com mobile app

Yeah that's not to bad just look up injector upgrades for your year Sent from my SM-G935V using Jeepz.com mobile app

A little,more like smother throttle response and a little better mpg ,but mostly a lot cheaper Sent from my SM-G935V using Jeepz.com mobile app

If you have to replace any injectors go with the ones that have 4 spray holes. I got mine from Pic & Pull ( out of a couple of Neons)yours might have a different injector plug Sent from my SM-G935V using Jeepz.com mobile app

It all depends on the maintenance of the jeep 300k + is easy 400+ is possible Sent from my SM-G935V using Jeepz.com mobile app

Right under the intake Sent from my SM-G935V using Jeepz.com mobile app

Cool while you are at it and have the exhaust manifold off check your EGR valve it could be stuck open Sent from my SM-G935V using Jeepz.com mobile app

If you have stock size tires,you might have a bad O2 sensor Sent from my SM-G935V using Jeepz.com mobile app

The reason I was asking my 88 went from 20mpg to about 15 . After an incorrect thermostat was installed (180) witch caused the computer to sense a cold engine and keep the o2 sensor in open loop. This caused extra fuel that overloaded the cat ,causing it to overheat and plug up. It only took...

Was this thing getting bad gas mileage before,and how long ago did the cat get changed. Was it running rich ? What temp thermostat is in it? Sent from my SM-G935V using Jeepz.com mobile app

The sensor they're talking about is the one on the firewall just above the valve cover on the divers side ,check the vacuum line from there to the throttle body,and the wires that are plugged into it Sent from my SM-G935V using Jeepz.com mobile app

It still sounds like a plugged exhaust,my 88 xj exhaust system was plugged it would be ok around town but anything over 30 mph it was a dog . Do a compression test that will tell a lot Sent from my SM-G935V using Jeepz.com mobile app

Be sure to check and clean all grounds. The wiring harness doesn't have good grounds. If you have replaced the crank sensor (they do go out) then check the C101 wiring plug by the brake booster ( I finally had to delete mine ) look up Renix ground refreshing and do it before spending time and...

See what voltage is on the fuel pump leads while starting and keep monitoring the voltage when it stalls Sent from my SM-G935V using Jeepz.com mobile app

Look at your fuel pump relay ,they go out all the time. One my 89 it would start and shut off like that ,the relay was bad ,the reason it starts is that the ignition bypasses the relay when starting.

Your fuel pressure seems realty low ,I think it should be like 25 or 30

Check your tps to ground also the Renix system needs GOOD grounds,at the fire wall too

Also check the map sensor ,the one on the fire wall above the valve cover ,see if it has a good connection,and a good vacuum hose .

87,88,89 and 90 xjs all had the Renix operating system they have a weak sensor ground system it is VERY important to clean every ground under the hood ,and check them with an ohm meter. Many people will start replacing sensors and other stuff and not ,or will not believe that the wiring harness...

OK check your map sensor