Sounds like it may be your ignition switch itself, it is making contact to let you start the jeep, but not making a disconnect when you turn it off.
SOURCE: How to replace the ignition in a 1988 Jeep
First thing you need to do is determine if the problem is in the key lock or the switch. Switch is located above the steering column connected to the lock by a rod. Instructions for adjustment/install are usually in the box with the new switch. If key lock is bad, you need to disassemble the upper column under the steering wheel...Instructions can be found in either chiltons or haynes. (book is useful for many other things and a worthwhile investment at around $20.)
SOURCE: My 1988 Chevy s10 2.5 cly. Won't fire. I pulled
All "crank, no start" conditions are approached in the same way. Every engine requires certain functions to be able to run. Some of these functions rely on specific components to work and some components are part of more than one function so it is important to see the whole picture to be able to conclude anything about what may have failed. Also, these functions can ONLY be tested during the failure. Any other time and they will simply test good because the problem isn't present at the moment.
If you approach this in any other way, you are merely guessing and that only serves to replace unnecessary parts and wastes money.
Every engine requires spark, fuel and compression to run. That's what we have to look for.
These are the basics that need to be tested and will give us the info required to isolate a cause.
1) Test for spark at the plug end of the wire using a spark tester. If none found, check for power supply on the + terminal of the coil with the key on.
2) Test for injector pulse using a small bulb called a noid light. If none found, check for power supply at one side of the injector with the key on.
3) Use a fuel pressure gauge to test for correct fuel pressure, also noticing if the pressure holds when key is shut off.
4) If all of these things check good, then you would need to do a complete compression test.
Once you have determined which of these functions has dropped out,
you will know which system is having the problem.
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