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Showing results for tags 'scan tool'.
Hello, I have a 1987 YJ 2.5L. It has a bad miss at idle once warmed up. It has a new fuel pump, MAP, Coolant sensor and the mechanic put a used fuel pressure regulator in it. Today, I hooked up my old Snap-on scanner. It shows that it is staying in open loop, it has 0 hg. of manifold vacuum, and coolant is not going over 155 degrees. I changed the coolant sensor and it reads exactly the same. Any thoughts would be greatly appreciated. Tony
Hello everyone, I have the best luck finding useful tips and information for things that are over my head. I have noticed a huge difference in what the tachometer reads verses what the scanner says. I looked all every where for a proceedure on how to test go about on figuring out why the readings are so different. Could my ecu have a problem?