You are technically right about "knowing about the mechanical side". But I do think that there may be a connection between the mechanical and electrical. 6.0 engines have an FICM that can fail when stiction(injectors not moving as quickly as they should, causing higher currents through the injector circuits) is present.
Is it possible that 7.3 engines have a weak link in the injector coil which can fail from the higher operating currents that result from the pintles hanging up? If the coil, which is very fine wire, opens up from this excess current, it would throw the code for high to low side open.
Larry

 

Solenoids: When the poppet, plunger, piston, or whatever is being pulled doesn't move - the current will rise and heat will be generated. The IDM may or may not see this as a short across that one solenoid (P126x code. Once the coil overheats and opens, then it could possibly show as an intermittent open - but more likely a stable open.

We're talking under 3 ms per activation - with a 77 ms rest at 3000 RPM. I doubt that little blip has a chance to really heat the coil up, but 120 volts is some respectable juice.

 

The injector solenoids have no connection whatsoever to anything mechanical. Hell, they don't even have an armature THROUGH them. They sit on top of the injector and receive voltage (current dictated by the resistance), create a magnetic field, suck up a ferrous armature plate, voltage is cut off, the magnetic field collapses around the coiled wire previously energized creating a flyback voltage, and the cycle repeats. An actual armature through the coil would have a little effect on the creation of the flyback voltage, but even at that, the IDM is too stupid to figure that one out.

Here's a question:

When the armature plate clearance is too tight and the engine is cold, what happens? In severe cases, nothing inside the injector moves. Why don't these circuit codes show up at that point?

 

Good info...At what temperature does this begin to happen?

 

Cleatus and Tugly make logical points. I was trying to find a connection between Mike's original posting about the possible cause of injector issues he may be having. When one thing happens (running out of veggie fuel) and then another problem comes up, I try to think of a possible connection. Often times it is just coincidental, but sometimes not. Did a lot of air mixing with the diesel cause an injector to fail in some way? That was my original thought which I didn't express well.

 

It is all good....and also logical by all parties. Whilst using logic, one has to consider coincidence...

 

I'm going to order a new valve cover gasket and UVCH. I know that one of the clips one the UVHC had cracked when I had to take the hybrids out to be rebuilt. I have the quarters in there and haven't had a problem until now. I haven't had time to look yet between the rain, snow and twenty degree weather. Truck wont fit in the garage.

 

That's no fun..........

 

Hopefully I get into this Saturday. Now P0272 shows up. Cylinder 4 contribution fault.

 

OK, Just now getting into this. I just disconnected the 42 pin connector. There is a spot that has rubbed through on one of the wire's insulation. It is a brown wire with a white tracer. I'm going to address this problem now and keep moving on.

Anyone know which wire this is?

 

They harness might be the same for all years, but what year is your truck just in case.

It isn't uncommon for the wires laying across the drivers side VC to rub and expose the wires causing a short. Definitely get that taken care of.......

 

or better yet, the pin location (on the 42 pin connector) associated with the wire would be more helpful.

 

Truck is 2002. I tried the OHM test from the Drivers side high voltage supply to #4 it didn't read anything. Tried all the drivers side bank and didn't read anything. Then switched to Passenger side, nothing across them either. not sure what I'm doing wrong...

I try to take the back cover off without breaking it to see the wire location.

 

Check out this thread as well.

Robert is testing them as you.... some good info & pics for extra reference might help.

https://www.ford-trucks.com/forums/1...-no-start.html

 

What is your meter set on