To start with, code 12 is loss of battery voltage within last 100 engine starts, which is normal if you had the battery disconnected, code 55 just means the computer has completed testing. I'm sure your problem is fuel related. Why did you replace all that stuff?
Listen close when you turn the key on, you should hear the fuel pump run for a couple of seconds to prime the rail. If not, start at the fuel pump connector and check for power when someone turns on the key. If there is no power, work backward toward the battery. You should check with a dealer as Chrysler/Jeep had a recall on the relay /fuse box under the hood(power control module), which would fail causing problems such as you are describing. They are really expensive, and the company was sued due to the many failures. If yours is bad, and you get no factory help, try to find a salvage part. I have installed used ones before that worked OK, but there is no guarantee how long.
SOURCE: 1996 Jeep Country Wagon. Replaced fuel filter and
My 99 Jeep Cherokee keeps shuting off when I am taking right turns. If anyone can point me in the right direction that would be awesome. I am really stumped.
SOURCE: 94 jimmy turns but wont start, I replaced the fuel pump and
Check to see if you are getting the correct fuel pressure at the rail. It takes at least 55psi to push past the propets in the spider assembly. Cold weather requires even more psi. You can test this with a cheap fuel pressure gauge from almost any auto part store.
I would also check to make sure the ground for your pump has a good connection, it should be located around your rear bumper in the center. A weak ground will dramatically kill your psi, but still push fuel to the rails.
There is also a problem with the "expensive" spider assembly of that truck. The spider assembly holds the single injector and has 6 tubes going to each cylinder. The lines going into the assembly are known to leak. If you take off the manifold you can easily see if there are any leaks from it, there will be wash marks where the gas has cleaned it. Instead of buying a new spider assembly, there are rebuild kits for it.
If for come to the conclusion that you need a new fuel pressure regulator, don't let them lie to you in saying you need to buy the whole spider assembly. You CAN buy it separately for around $40. If you have problems finding it at local stores, search for it online.
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