New injectors rough idle.

DZL JIM · Jun 18, 2012

Bean said:
Try a different oil even if its dino oil. Try Delo or Motorcraft atleast. What you are describing is exactly what we could not tune out of a truck with Rotella in it.

If this might happen to be the truck I am thinking of, unplugging the ICP sensor and setting the default ICP to 724 psi made the truck idle near puuuuurfectly...
Might be oil, but also could be ICP tuning.

Bean · Jun 18, 2012

Jon tried for two days to fix it with live tuning, up with ICP down with ICP. All of it would make it start to idle perfect then back to a rolling idle after about 30 seconds. So after all that we added the additive to it witch boosted the anti foam agents and it immediately calmed down and started idling smooth.

DZL JIM · Jun 19, 2012

Bean said:
Jon tried for two days to fix it with live tuning, up with ICP down with ICP. All of it would make it start to idle perfect then back to a rolling idle after about 30 seconds. So after all that we added the additive to it witch boosted the anti foam agents and it immediately calmed down and started idling smooth.

Yes, but eventually went back to rolling idle, even after full Schaeffers oil change. Only by unplugging the ICP sensor did it smooth right out. He wasn't sure if Jonathan ever tried idle ICP above 650, but at 724 psi it sat and idled great.
Just throwing that out there.

Bean · Jun 19, 2012

Pretty sure he did but I dont know for a positive.

With the ICP unplugged the pcm is no longer compensating for anything, it picks a preset dutycycle and holds it since it has no pressure feed back. So it may not have anything to do with what pressure its at as much as the pcm not knowing whats going on with pressure. If he is still getting bubbles on the dipstick then there is something wrong with his pickup tube and no tuning or oil will fix it.