After 36 years of various noises associated with submarines, mortars, small arms, and missiles, my hearing is not what it was in my younger days.

I had some cold start/miss issues with the F350 and replaced the IDM with one from DTC. That cured the problem. Truck runs much better. Now I have the miss back. It's blowing smoke until it warms up and oil usage is quite a bit higher.

I downloaded Forscan to my laptop and started running some tests to find the issue. I ran the buzz test and had 5 injectors emit a much lower sound level than the other three. The injectors are original with approximately 110,000 miles on them. Low mileage, lots of idle time and low speed.

The truck was a "farm truck" and had apparently had a bunch of biodiesel run through it. When I dropped the fuel tank to fix an issue inside, there was about a half inch of, what looked like, grease in the bottom of the tank.
I removed all of that and flushed the fuel lines.

With the different sounds coming from the injectors and the way the truck is running, I'm thinking that I probably need new injectors. If I replace them, what would you recommend as far as brand and dealer? I've been thinking Alliant and Riffraff or CNC Fabrication.

I really enjoy this site and the people on it seem to know their stuff. Keep up the good work.

Gruntsquid out

 

Rosewood. I had an idea for your hearing impaired buzz test. No idea if it will work or not but most newer smartphones have a high def audio recorder and editor that will graph the audio recording. I wonder if a person could pick out failing injector solenoids by looking for different spikes on the graph. I imagine you'd need to locate the phone as equidistant as possible to get decent accuracy, and it may still not work reliably but a thought I had. I might give it a try myself just out of curiosity.

https://www.rosewooddieselshop.com/

 

I just dropped off my injectors at Rosewood Diesel this morning. They are building mine as 160/0 single shots. I have a Hydra and talked them and will be doing the unlock for single shots. My truck would not start when cold outside, which was quit often in Truckee, heck it just snowed there this last weekend. Thankfully I moved to a warmer climate in Northern Nevada but am currently at my second home 25 minutes from Jim's Rosewood Shop which made dropping them off easy and convenient.

 

Since it was too hot to be broiling myself out in the sun, I decided to stay in the shop where it was much cooler.

I got re-familiarized with Forscan and ran a few more tests.
DTIC - P0475 (exhaust pressure control valve malfunction) and P1298 (IDM failure). It's my understanding that the P1298 is normal with the high voltage/high current output version of this unit.
Perdels - idle to 1500 rpm
Cyl 1 - 0% constant
Cyl 2 - 0% to 8 %, erratic
Cyl 3 - 0% to 1.44%, erratic
Cyl 4 - 0%, constant
Cyl 5 - .3%, erratic
Cyl 6 - 0%, constant
Cyl 7 - 0%, constant
Cyl 8 - 8.5% to 9.7%, constant
ICP pressure - ~ 490 psi to 1167 psi @ 1500 rpm
IPR - 7.8% to 8.2% from idle to 1500 rpm. @ 3200 rpm it read 14.45%.
From 1500 rpm to 3200 rpm the cylinder readings were basically 0%.
Fuel pulse width - ~2.46 ms.

I did notice on the o'scope graph that all of the cylinder readings would go higher at ~the same time up to 1500 rpm. Possible air leak on fuel line?
Any suggestions as to other tests that need to be run?

Gruntsquid out

 

Was 1167 psi as high as it got? How about when you took it up to 3200, did it rev smooth and hold steady there? Did it fall back to a steady idle when you let out of it too?

An easy way to check for air in the fuel is to put a section of hose on the fuel bowl drain and run it into a jug. Open the valve and cycle the key for a second or 2. If you get any bubbles in the jug then you've got a leak in the suction side.