ok so at work we have a 2001 f-550 7.3 truck has been runnign rough and when you first start it up and drive it, it smokes like a house on fire for about half a mile, white smoke. i did a buzz test and it was saying #3 short/open to high side. and when i did a cylinder contribution test i had a miss on 3 and 8. i changed the uvch's and plugs and checked the wiring all the way to the IDM. all checked out. i even swapped injectors from 3 to 7 to see if the miss follwed, so i put a good idm out of a good running truck performed a buzz test and it passed no codes. so i ordered a idm from the dealer put it in and did the buzz test and it fails. this time for #3 and also #4 and a short to batt pos. now i take another IDM out of another truck. not the same truck as before and it has completly differnt codes. it seems like with every IDM i try im getting differnt codes so i dont know what to believe and what direction to go in. any ideas or help would be great. thanks guys
7.3 problem please help
- Thread starter nickg9785
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