GreasemonkeyHd
New member
Just bought my first duramax truck. Only had cummins trucks and one 7.3 that I still have as my primary vehicle. It smokes and misses steadily on one cylinder. The balance rates looked like Cylinder #4 was the problem reading a 9.04, I had no CEL . It doesent tick or have any blowby whatsoever. Lb7 cab lly motor, previous owner said one of the diesel mechanics he took it to said its the ficm the other two said injectors. Fires right up every time. I put some hot shots in it and ran it in the driveway because I heard good things about it , smoke cleared almost all the way up and was running way smoother. Took it for a drive about a mile or so down the road nice and easy. Started clattering when I went to turn around. Check engine light came on and it started idling rough and clattering like a tractor. Limped it back home and it was throwing a p0201 code. Shut the truck down and let it sit for a few minutes then fired it back up. Ran smooth again with no smoke, gave it a couple Rev and immediately went back to clattering and running rough. My scanner says miss communication with ecm every time I try to clear a code even though the check engine light shuts off. Says check my plug in and ensure the vehicle is on. Seems to throw a a different injector control circuit code every time the cel comes on. Checked the harness by the alternator already and ice picked cylinders 1, 7, and 2 injector plugs
