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Hello All, i need your help. i have a 2.5L that I cannot make run with the MAP sensor plugged in. I have tested the MAP sensor and it reads good. i have tested the MAT, Engine Temp and Idle Air Control Motor as well. Replaced the TPS, O2 sensor and the ECU. i have checked for Vacuum leaks and have come up with nothing. it runs better with the MAP unplugged from vacuum. I am running out of ideas. Any help would be greatly appreciated.
Here is 1987-90 Jeep YJ Wrangler and Jeep XJ Cherokee/MJ Comanche 2.5L TBI diagnostics information in PDF form. The first document includes all sensor and switch tests plus adjustments that affect engine tune, idle and reliability. Wiring schematics and ECU pin locations, test plugs and diagnostics included. Jeep 2.5L TBI Complete Diagnostics-Sensors-Switches.pdf Jeep 2.5L TBI ECU Inputs and Outputs.pdf Jeep 2.5L TBI MAP Sensor Test.pdf Jeep 2.5L Timing Chain and Tensioner.pdf Jeep 2.5L Valve Timing Check.pdf Jeep YJ 2.5L TBI Sensors and Pinout.pdf YJ Wrang