Have a 2006 Ford F150 4X4 5.4 vin 5.
Sometimes it will make noise like timing chain is slapping and then stall, happens most at low rpm and in gear D and R .
When it first started would lose comm to PCM.
Change pcm not losing comm to pcm any more, but still doing same thing.
No codes, oil pressure hot at idle 30psi and 60psi at 2000 rpm.
Any help please.

 

Does it only do it when engine is hot or at any time. If only when hot I suspect it is the vct solenoids. Ford has a new updated part that supposedly gives more oil pressure to the phasers.

 

yes it only does it hot

 

Your phasers are losing oil pressure and causing the stall. It may be a combination of things. The new vct solenoid should help. You likely are losing some oil pressure from blown time chain tensioner gaskets. You may have wear on the chains and guides. You could also have worn camshafts and journals. Only way to tell is to tear it down. That being said you could do a phaser delete that would most likely rectify the problem.

 

ok thanks for the help