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Can someone confirm that FICM Sync is just confirming that the Cam and Crank position sensors are operating and sending agreeable data?
My truck ran great for about 1k miles after I finished the Head Gasket/Stud job, but a couple weeks ago I put a new IPR in and now it builds pressure like crazy but idles rough and if you step on the throttle it acts like it has a misfire or just isn't running on all the cylinders.
Using FORscan, I get "FICM SYNC", 47.5 to 48 volts to the FICM, great pressure from the ICP (the only time the demanded and actual pressures were any different is if you try to rev to high or to quickly, then they mismatch).
I am throwing codes on all 8 glow plugs, but this problem remains even after the truck idles and is up to temp.
It did have a Crank Position Sensor error last week and I was going to replace it, but if I get a good reliable FICM sync, doesn't that mean that the Crank Position Sensor is operating normally and that error has since gone away.
Can I have good voltage and FICM SYNC and still have a bad FICM???
2005 CCSB F250 FX4
Studs, New H/G, Blue Spring Mod, PHP 40 HP Atlas tune and 80 HP Heavy Tow tunes, and a new turbo.