Throwing an IDM Code...ugh...
Elder User
Joined: Sep 2011
Posts: 979
Likes: 4
From: Vancouver
My point being that the "buzz test" and any associated codes from the IDM have absolutely ZERO to do with any mechanical issue that would have or could have been created by running out of fuel or by running anything other than #2. The fact that the OP runs an alternative fuels in his pickup will in no way cause an electrical malfunction.
To put it into "few words":
The IDM has no way in hell of knowing what the mechanical parts of the injector are doing (no system on the 7.3L does) so ANY IDM or injector circuit fault codes HAVE to be electrical problems.
To put it into "few words":
The IDM has no way in hell of knowing what the mechanical parts of the injector are doing (no system on the 7.3L does) so ANY IDM or injector circuit fault codes HAVE to be electrical problems.
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
Hotshot
Joined: Jan 2011
Posts: 18,849
Likes: 179
From: Puget Sound
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.
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.
Butt-Head
Joined: Apr 2004
Posts: 9,453
Likes: 2,936
From: Reed Point, MT
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?
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?
Posting Guru
Joined: Sep 2014
Posts: 2,404
Likes: 3
From: Asheville-where weird is
Good info...At what temperature does this begin to happen?
Elder User
Joined: Sep 2011
Posts: 979
Likes: 4
From: Vancouver
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.
Posting Guru
Joined: Sep 2014
Posts: 2,404
Likes: 3
From: Asheville-where weird is
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.
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Laughing Gas
Joined: Feb 2004
Posts: 1,080
Likes: 1
From: Elsinboro, NJ
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.
Post Fiend
Joined: Sep 2006
Posts: 7,426
Likes: 6
From: Sioux Falls, SD
That's no fun..........
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Laughing Gas
Joined: Feb 2004
Posts: 1,080
Likes: 1
From: Elsinboro, NJ
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?
Anyone know which wire this is?
Post Fiend
Joined: Sep 2006
Posts: 7,426
Likes: 6
From: Sioux Falls, SD
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.......
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.......
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Laughing Gas
Joined: Feb 2004
Posts: 1,080
Likes: 1
From: Elsinboro, NJ
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.
I try to take the back cover off without breaking it to see the wire location.
Post Fiend
Joined: Sep 2006
Posts: 7,426
Likes: 6
From: Sioux Falls, SD
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
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
Logistics Pro
Joined: Oct 2011
Posts: 3,953
Likes: 120
From: Mcdonough, GA
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.
I try to take the back cover off without breaking it to see the wire location.