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If the check engine light does NOT light up on the dash when you turn on the ignition, then your ECU is in need of repair. The engine will
only start after the check engine light comes on and the ecu is what
controls that. It's likely going bad, causing the delayed start problem
typical of early 90's jeeps. Repair or replacement services for your
jeep ECU are available on ebay.
CHECK ASD RELAY THAT IS AUTOMATIC SHUTDOWN RELAY IN THE POWER DISTRIBUTION CENTER UNDER THE HOOD IN ENGINE COMPARTMENT.IF ASD RELAY GOOD PROBLEM COULD BE CAMSHAFT SENSOR IN THE DISTRIBUTOR.TO SAVE TIME AND MONEY HAVE JEEP SCANNED FOR CAMSHAFT SENSOR AND CRANKSHAFT SENSOR FAULTS.
Reaching your Findings I would go to Checking the The Idea of Timing chain Problem #1 Top Dead Center on Compression stroke, remove dist cap and see where Rotor is Pointing, it should be pointing at #1 Plug wire if not Timing chain & Gear Replacement time. If all Is Well there PLEASE Confide in Me I would Love to Help Thats My Mission here Good Night and Take life EASY, Rejakwilson