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Bad FICM computer cause low oil pressure?
Hi, I have a question about my truck(03 F350). No start issue.
when I disconnect the FICM, the high pressure can go to 800 or 1000 PSI when cracking.
but when I plug FICM in, now matter how I crank, I can only get ~400psi. hence now start.
The FICM voltage is good at 48.5 and FICM sync is 1.
Initially, with old injectors, if I unplug 2 injectors from driver side with FICM plug in, the truck can start and run but very rough. So, I thought I have injector leaks, I replaced all four driver side injectors. With new injectors, I can't start at all with FICM plug in.
I am thinking I have a bad FICM computer and is messing up with injector timing cause lower high pressure PSI, Is this even possible? Or my issue is really a weak HPOP pump? If it's the HPOP pump, why I can get 1000psi without FICM plug in?