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you can get the trouble codes out by turning key on off on off on then watch the check engine light it will flash a number of times n pause this will give you codes to take to the auto parts store n tell them they will know most of them the service writer at the dealer can find the rest (example) blink blink blink pause blink blink =32 there could be several so do it a couple times to make sure you get them right and get them all
If you hear relays clicking sometimes and the jeep won't start, at those times, is the check engine light illuminated on the dash, or not? If no check engine light is on the dash, at times when the jeep won't start, your ecu is in need of repairs. The ecu sends power to the ignition and fuel relays and when the ecu starts to malfunction, the relays usually start clicking.
Your problem does not have anything to do with code 593, the computer reset therefore allowing the truck to start. unplug your EGR valve and see if it starts up then, if so and runs normal replace your egr valve, if no change check/replace your Idle Air Control Valve.
Does your cars check engine light come on or off at all? If you had a misfire, it would trip the check engine light. Often a misfire is caused by a bad ignition module, and not just one sparkplug, but the only way to see what your car is doing is to have it scanned to see if anything is stored in the memory. Often , auto parts stores will do this for free, and that way you might have a clue to what is going on under the hood!
First of all your car needs too have the battery disconnected but only the negative terminal, usualy black in color if you have caps over the terminals. second wait 10 minutes before you reconnect it. third have a auto parts store hook it up too a code reader, it will tell you everything that you want too know about what is causeing the problems.....most places do it for free as a service.
if it has a check engine light the simplest thing to do would probably go to auto zone or advance and ask them to do a code check,its free and will probably tell you the problem and take allot of the guess work out of it.