No primary spark to fuel injectors 90 jeep cherokee
If the check engine light does NOT come on when cranking, at the times when it won't start, and the relays are clicking and buzzing, 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. ECU is likely going bad, causing the delayed start problem typical of early 90's jeeps. Reasonably priced repair or replacement services for your jeep ECU are available on ebay.
SOURCE: 1998 jeep grand cherokee will not start
Try resetting the asd "auto shut down fuse had a similar problem the jeep would crank but did not get spark or gas also check your fuel pump? and the asd relay may be bad it will prevent the jeep from getting no spark and will not fire some jeeps have security problems
SOURCE: 1999 Jeep Grand Cherokee Larado wont start.
If computer sees no crank sensor signal it shuts down pulses to the injectors. But, you bring something new into the mix. Make sure fender grounding is good so the relay can operate properly and make sure power going to it is not restricted by a loose or dirty contact on the power side.
Testimonial: "Sounds like a good start"
SOURCE: how to change fuel injectors in a 2000 jeep grand cherokee
Hi, you have to remove the fuel rail and then remove the electrical connector and then there is a clip that holds the injector to the fuel rail remove that clip and then remove the injector
SOURCE: jeep grand cherokee throwing code po204 p0203 ckt
Check the condition of the wiring, the connector and the injector itself at cylinder 3 and 4
If an injector is suspected you can swap it with an other one to see if problem will follow.
If you have tester and knowledge you can test each of these two for correct voltage.
Hope it will help
Dan
SOURCE: 4x4 vacuum for jeep 90 cherokee need schematic
pick up a hains manual or go to an autoparts store like auto zone they can pull up and print you 1
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