I have a 1999 mitsubishi eclipse gs with a 420a motor, and I have a confirmed code for a random cylinder misfire and 4 pending codes for all 4 cylinders. I've had this vehicle for 3 years and in that time I have replaced the motor which still gives me the misfire codes. Before and after. Then I changed the ecu. Along with the sensor on the engine TPS, IAT, IAC, MAP, CAM, CRANK, ECT, KNOCK. AND OIL PRESSURE SENSOR. I've taken it to a mitsubishi dealership and all they did was a compression test which only told me my engine was healthy, but continue to have a misfire. I also changed the fuel pump, filter, and regulator, and Injector, and O2 sensors both of them. It misfire at idle, while I drive, you can also feel it the most when the RPM hits 4500, then it misfire back towards 3500. This is my daily driver so I can't do a crazy amount of work at the moment. I have also use a vacuum gauge to see it is in the right range. The range is suppose to be 17-22 but it was fluctuating between 15-16 at idle. I haven't done a fuel pressure test yet.

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1999 Mitsubishi Eclipse Random misfire

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13/05/2021 8:40 am

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