working on a 97 f350 4x4 7.3 and every once in a while (a couple times a week) if you floor it it will act like its running out of fuel (like draining the bowl on a carberated motor) if i let it sit and idle it will pick back up and be fine for a couple days. just had a new mechanical fuel pump put on it. and a cam sensor. and it will lope when its first started after sitting a few hours or overnight.


any help appreciated!!

 

Check your fuel pressure at the schrader valve at idle...

 

Yea what he said

 

51psi at idle engine at operating temp. its intermittent and he runs bio diesel in it. i did a BG fuel injector flush and he hasnt complained again yet. but im not sure that cured it.

 

Quick and dirty test would be to take the valve covers off, start the truck, watch the oil spouts. They should dispense the same amount of oil. Also, unplugging each injector should result in a significant change in idle. This will help rule out injectors. Next to that you need to see what the HPOP is doing.

 

if it is intermittent, then it sounds like an electrical issue. Mechanical issues have generally consistent symptoms.

 

how can i do a HPOP test and what do i look for?

 

Scan it... Check the ICP pressures and duty cycle when driving.

Also run a buzz test and a cylinder cont test.

 

sweet i just got the new snap-on solus ultra scanner too so ill get on it!