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Update: I found that my wiring harness is melted to itself across most of the intake manifold. The melty mess starts near the splice off the firewall, and continues at points across the intake manifold. This branch of the harness controls the injectors, all throttle body sensors, 02s, and some...

Thanks Tim and Tripled. I suspected 5V on the sensor wire was a problem. I ruled out the computer by swapping in an identical model, with no changes. I have and OEM MAP sensor on order, and I am looking into the wiring diagram to check routes for a short. I am hoping for an obvious...

Thanks Tim. I checked the grounds and cleaned them, but no changes. As for the coolant temp sensor, it bench tested fine, and computer seems to be reading them properly, and match the dash temp. Continuity testing of the MAP connector to the pins in the PCM connector all read 1-3 Ohms...

Hello, my 2000 XJ (4.0L, AW4, NP231, 230,000+ miles) is running poorly with codes P0108 (Map Sensor High Voltage)and P0132 (Left-Upstream O2 Sensor Shorted to Voltage). I first noticed the jeep running poorly when driving in a hilly area in the rain. The next day on a 30 minute drive I couldn't...