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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 Wrangler 2.5L TBI Wiring of WOT to ECU.pdf Jeep YJ 2.5L ISA Wiring Diagram.pdf 1987-90 2.5L TBI Intake Manifold and Sensors.pdf 1987-90 YJ Wrangler 2.5L TBI Emissions System Parts.pdf YJ Wrangler Fuel Filter and Guard.pdf 2.5L TBI ISA Motor Adjustment.pdf Used in conjunction with the many forum exchanges (search under "All Content" and "2.5L TBI" in the search box), plus the Jeep 2.5L TBI troubleshooting article at the magazine website, this information will help solve your Jeep YJ Wrangler or XJ Cherokee 2.5L TBI troubles. In references, the Model 81 is the Jeep YJ Wrangler. The Model 60/70 is the XJ Cherokee and MJ Comanche Pickup. Moses
Hey All, I have had my jeep for around a year, the only issue I have had is a bad master cylinder that had to be replaced, but since then no problems as a daily driver. Over the past few weeks she has suddenly started stalling on me and I wanted to get an opinion on what the symptoms point to so I can try to pinpoint the issue. So far I have tried replacing the ignition coil, and that did not fix the overall problem. Here are the symptoms: 1987 Jeep Wrangler Sport YJ 2.5 TBI. Jeep has started to stall at stop signs and stop lights, but only after getting warmed up (15 minutes or so). Stalling completely takes out brakes and power steering, but battery shows fine, and all interior electronics work. When turning the key on, I can hear the fuel pump going, and it doesn't stop. Previous owner said to not turn the key to accessory and keep it there as it will kill the fuel pump as it doesn't turn off. This doesn't seem normal to me? Jeep idles high when started, goes down to normal idle, and once warmed up will idle rough and low, 600-700. Idling will not cause her to die though, only movement and shifting. Jeep will not start back up once shes been running or after she stalls unless she sits for 10-15 minutes, and she will start fine but a little rough. 6 Months ago or so she started not starting occasionally unless I pushed the gas slightly as I cranked and she would then squeal and start rough. My action list for what I think might help or fix the issue, just waiting for a non rainy day: Check the ISCM module, clean it and check that its working (Whats the best process for making sure it is working as it should be?) Clean the throttle body and check for even fuel spray Replace crankshaft position sensor Replace fuel filter Replace fuel pump relay in hopes of stopping the thing from constantly running Check fuel pressure Replace fuel pump (My final resort, I will have a shop do this as I do not have the means) I am including a picture of my throttle body, how do I go about cleaning it? I cannot seem to find much about this online, every video or site shows what I am guessing a different fuel injection system. Do I remove the injectors on the top and clean underneath with throttle body cleaner? The jeep is 30 years old and is in really good shape for its age, I don't want to screw anything up, but I want to learn all I can. I guess I mainly want to know if I am in the right direction. I appreciate it. I have also read this thread: And it was also extremely helpful. Thanks! Tristan (Sorry for the long post, I wanted to give as much detail as possible)