Injectors? HPOP?

Wesley · Sep 5, 2015

Still a little green and having some issues, on first startup after truck has sat long enough to cool ive got a few (not sure how many) injectors that dont seem to be working, but after warmup they are fine, could it just be a oil pressure issue since they eventually work or are my injectors junk? Any input appreciated, thanks

Patrick Feeley · Sep 5, 2015

How many miles are on this engine? If the injectors have a lot of miles on them, the poppets could be worn. You could always start it with the valvecovers off and inspect the injector oil discharge spouts for consistent oil discharge. You could also see if any poppet screws are loose and measure the armature plate clearance. You have to remove the 4 torx screws holding the solenoid on. The poppet screw is right in the middle underneath. The clearance can be checked by measuring the clearance between the injector body and the square armature plate. If any are less than 0.002", they are pretty worn. Cheers!

Justin@DP-Tuner · Sep 8, 2015

Patrick Feeley said:
How many miles are on this engine? If the injectors have a lot of miles on them, the poppets could be worn. You could always start it with the valvecovers off and inspect the injector oil discharge spouts for consistent oil discharge. You could also see if any poppet screws are loose and measure the armature plate clearance. You have to remove the 4 torx screws holding the solenoid on. The poppet screw is right in the middle underneath. The clearance can be checked by measuring the clearance between the injector body and the square armature plate. If any are less than 0.002", they are pretty worn. Cheers!

:whs:

If the injectors have a bunch of miles on them, I would say that is your culprit.

Does not sound HPOP related at all.

Magnum PD · Sep 8, 2015

Were the injectors taken out at any time?

Wildman · Sep 9, 2015

Does it have a lack of power until it warms up?

Sounds like typical injector stiction. The spool valve in each injector needs to move freely side to side in order for the injector to function. Issues such as varnish, sludge, and oil contamination can cause the spool valves to be sluggish when cold, which affects both the volume of fuel injected as well as injector timing.

I've heard a product called archoil can help, but generally you just need to replace the injectors and use a a good quality oil to prevent a recurrence.

lincolnlocker · Sep 9, 2015

Wildman said:
Does it have a lack of power until it warms up?

Sounds like typical injector stiction. The spool valve in each injector needs to move freely side to side in order for the injector to function. Issues such as varnish, sludge, and oil contamination can cause the spool valves to be sluggish when cold, which affects both the volume of fuel injected as well as injector timing.

I've heard a product called archoil can help, but generally you just need to replace the injectors and use a a good quality oil to prevent a recurrence.

7.3s dont have spool valves...

live life full throttle