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Power Strokes
7.3 Aftermarket
7.3L Miss at Mid-RPM
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[QUOTE="Jessy7.3, post: 1343762, member: 24223"] I know my truck had a rough idle when the icp was on its way out but my truck did the opposite of yours, it would run rough when the truck was cold and it would warm up, CEL would go away and it would run nice and smooth. I'm wondering if there is not an issue with a wire between the Pcm and icp sensor. You could use an ohmmeter at the pcm and go off of the pins for the icp. Have the batteries unplugged, and put a jumper between the signal and signal return and it should read near 0 ohms. Also make sure to discharge the static electricity from your body before touching the Pcm. Or if you wanted better accuracy to see if your having a loss in the wires is to find the right wires at the Pcm that go to the icp and watch for "voltage drop" across the wire but batteries need to be plugged in and and probably have to be running in order to make a voltage drop test. It really seems like a icp problem too me. I know my one guy who had a terrible miss problem but his was all the time and not hot or cold. Turns out it was just the connector had pins that weren't making a good connection at the icp. Sent from my iPad using Tapatalk [/QUOTE]
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7.3L Miss at Mid-RPM
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