Question about 1994 Jeep Grand Cherokee
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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Posted on Jan 02, 2017
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