Engine miss

[Rawze]

(02-08-2023 )Gapvalley Wrote:  I followed the video when rail pressure comes up I cut the key off. Pressure falls off instantly like less then 5secs. Used a block off tool on the rail capped off each injector and performed the test over with the same results. Rail pressure relief valve was replaced not long ago for this same code. Truck had all 6 injector put in 2 year ago. High pressure fuel pump makes a lot of noise when it ramping pressure not sure if this is normal or not.

It will not fall off like you describe unless something is very wrong.

You can cap off up to 3 injectors at a time. .. and of course, the issue could be with the pump itself too.

Those fuel pumps need all their guts (tappets, rollers, plungers, etc. ) replaced every 8,000 hours or 400,000 miles. If not then they have the potential to destroy the entire engine, turning it into a boat anchor with no possibility of recovery.

also, if it is leaking that badly, and you suspect more than one injector (does happen), then a poppet tester might be needed to find it too ...
ref: http://rawze.com/forums/showthread.php?t...56#pid2556

Also.. garbage, half-baked delete programming can cause injectors, relief valve, or even the pump to fail like that too. Something else to consider if it is deleted and you have not had the program reviewed by me to ensure its correctness.