Question about 1994 Jeep Grand Cherokee

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I purchased a 1994 Cherokee Larado with a 4.0 6 in it that had been sitting for about two years un started. Animals had nibbled on wiring in various places including fuel lines, crank position sensor and cam position sensor. I replaced those and dropped the fuel tank and repaired the fuel lines and replaced the fuel filter. I have also replaced the throttle position sensor, and the other sensor on the body of the choke. I also replaced at the suggestion of the parts counter guy the air temperature sensor located towards the rear of the intake maniford. I have a new map sensor but haven't installed it yet. New plugs, rotor and dist cap as well. The Jeep starts, runs sweet for approx 2 min and the Auto shutdown relay kills it. What am I missing here? I haven't measured the fuel pump pressure but think it's ok. What about the fuel pressure regulator located on the end of the fuel rail? I have located a couple of chewed wires and spliced them but I am stuck. My daughter really wants to take this car to school in a few days. Any help would be greatly appriciated. Ken

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Unless you are really lucky I don't think you will meet your deadline. One wire out of place or dis-connected can cause all kinds of problems. I'd begin by checking every fuse in the vehicle, especially those in the power distribution center. Often if a sensor is shorted one of those fuses will fail.
Your next project is to get a good wiring diagram (chilton is best for that) and beginning at the computer main harness connectors, you will need to test each wire by using an ohmmeter, (battery disconnected) testing continuity between each connector pin and writing down each sensor connector pin location that shows continuity for that pin, then comparing it to the book diagram.By doing that, you will develop a complete picture of where each important wire in the harness goes. I'd do a visual inspection of the harnesses first (I know you did that) making sure the O2 sensor harnesses are intact.
Since you have a new MAP sensor, put it on. Also, remove the idle control motor next to the throttle position sensor and clean the passage going to it and the control plunger. Don't turn the plunger and don't loose the small "o" ring though.
Default for the fuel regulator is full open and that generally will cause the engine to run rough with black exhaust (very rich mixture) If you don't see that it's probably OK.
I have only one sendable diagram...http://www.scribd.com/doc/18999822/Jeep-Wiring-2 That may help you a bit.

Posted on Aug 25, 2010

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