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  1. C

    Can someone measure their sensor ground?

    Awesome, thanks for the clarification. I only know enough about electronics to make me dangerous. Of course, the downside to this is I still have no idea what's going on with the engine. Back to the drawing board!
  2. C

    Can someone measure their sensor ground?

    I need some troubleshooting help on my 94 4.0. If someone can disconnect one of their sensors (I'm guessing water or intake air would be easiest) and then measure the sensor ground resistance to the negative battery post (black with blue stripe on my 94). I'm looking to compare the difference...
  3. C

    Testing Jeep O2, Oxygen sensors

    I replaced the main ground wire to the pcm with one direct to the battery, but no difference to the running issue(getting a good .01 Ohm connection though at the O2 sensor). The sensor ground is now showing about 1ohm with the key off, but it jumps to 35ohms when the key is on. I know the PCM...
  4. C

    Testing Jeep O2, Oxygen sensors

    Thanks Mike! Yes, I've double checked/cleaned all the grounds. I guess my concern is that all the sensors share a common ground, which is sourced to the PCM, not a hard ground point. I assume the PCM switches it internally from one of its ground inputs. But I suppose a ground is a ground! I'll...
  5. C

    Testing Jeep O2, Oxygen sensors

    Mike, Can you confirm that BOTH the direct ground and the sensor ground should be close to 1ohm or less at the battery on a HO (I've got a 94 for reference). My direct ground (all black) is showing about 1.4 Ohms, but the sensor ground (black w/green stripe that receives ground from pin 4 on the...
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