I recently put stage 1 injectors in my 03 7.3 and I've had problems ever since. It runs very choppy at an idle after warmed up and there is a ton of white smoke on cold starts. It smooths out at a high rpm and starts getting choppy as I decelerate. I had the truck put on a scanner and all 8 injectors passed buzz test but cylinders 1,2 , and 8 aren't firing correctly when it is running. I have a ts performance chip but it us not custom tuned. Could tuning cause this problem or could it be a cam sensor or something else? Thank you
I would go thru the steps of diagnosis of the issue first. Put a scanner on it and watch ICP and IPR @ idle. Get some correct tuning as if your going to run singles you should be running proper tuning. As for it running rough down at idle and lower rpms than higher it can be the injectors. A set that is not balanced (not flowing the same) will show up near idle and low rpm. Slight imblance to a set of injectors will be masked as the rpms increase. There have been a few trucks I had seen on the forums that were running that brand and they chased their tail trying to troubleshoot to find out it was the injectors. With a good set of injectors it is about moving X amount of fuel in X amount of time for the complete set.
If it is shaking horribly I will put money on injector issues rather than the tuning. You can pull the solenoids off with the injectors still in the truck and use a feeler gauge to check armature gap. If it is less than .002 on any of them I would be pulling them back out. The last guy to have issues with that brand pulled them and sent them to PIS and they came back fixed.
I was having the same issue rough idle an when you slow down kind of sound like it was sputtering. Had a different tune put in an clear it up a little but not all the way. Now I am at work for 2 weeks an have to wait until i can fix the problem.
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