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I was wondering if a previous owner had changed out the ECU. I have a rebuilt set of injectors sized for the 94 3.9 about 2 or so years old. The O2 Sensor is 3 years old. I'm getting around 14-15 mpg's. When I did the plenum before I changed the injectors I got 19 mpg's on that first tank of gas which was mostly hwy miles. Then it started going downhill and has stabilized at 14-15.
OK Tires were low, down to <30PSI which is odd since they have less than 7500 miles on them new. Edit-I used my tool to tighten the stems. I detected no looseness.
What brand O2 Sensor is meant for the 94 3.9?
Last edited by onemore94dak; 08-11-2017 at 07:30 PM.
OK Tires were low, down to <30PSI which is odd since they have less than 7500 miles on them new. Edit-I used my tool to tighten the stems. I detected no looseness.
What brand O2 Sensor is meant for the 94 3.9?