Originally Posted by
Maxirat427
They use the same OS but the 07 Silverado has a fuel system control module. It varies the fuel pressure according to demand. 07 Suburbans do not have it. So I am having some drivability issues. I am able to toggle that feature off, but it still runs the same. It is like there are no alternate injection tables to pull from. 08 Suburbans do have the FSCM so it will not work either. Also, the Suburban has a different trans OS from the truck. That's why I would love to get a true 07 engine and trans tune.
Thanks