02 f250 7.3- Injector Solenoid?
#62
09-07-2017, 02:10 PM
I haven't re-read all posts on both threads so .. if you did replace the external pigtail on that bank it's also possible injector 5 wiring has an internal short to the glow plug, just getting worse. Yes, with new parts I've heard of this happening although it's more common to be under valve cover issue. If you have another external pigtail I would just throw it in there with quick wrapped wire connections to verify.
#63
09-07-2017, 02:14 PM
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The wire that wraps around the injector wires is a RF shield that suppresses the high voltage spikes applied to the injectors. On the injector side it connects to nothing and on the 42 pin side don't really know. In any case it won't create the issue on #5 injector as you described.
This problem should be simple, divide and conquer.
1. You already know from the IDM to injector #5 there is low resistance correct?
2. Unplug the 42 way connector and measure towards injector 5, is it still low? If not then the problem is between the other end of the 42 way connector and the IDM wiring. If it is still low then the problem is somewhere after the 42 way connector towards the valve cover.
It almost sounds like the valve cover gasket is shorted internally to a glow plug terminal, ya can't see it but is is know to occur from time to time with new parts.
This problem should be simple, divide and conquer.
1. You already know from the IDM to injector #5 there is low resistance correct?
2. Unplug the 42 way connector and measure towards injector 5, is it still low? If not then the problem is between the other end of the 42 way connector and the IDM wiring. If it is still low then the problem is somewhere after the 42 way connector towards the valve cover.
It almost sounds like the valve cover gasket is shorted internally to a glow plug terminal, ya can't see it but is is know to occur from time to time with new parts.
Resistance @ UVCH by itself for every injector is .1, is this to low?
On my spare UVCH the resistance is the same, .1
#64
09-07-2017, 02:19 PM
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Stumped?
I haven't re-read all posts on both threads so .. if you did replace the external pigtail on that bank it's also possible injector 5 wiring has an internal short to the glow plug, just getting worse. Yes, with new parts I've heard of this happening although it's more common to be under valve cover issue. If you have another external pigtail I would just throw it in there with quick wrapped wire connections to verify.
Thanks everyone!
#65
09-07-2017, 02:29 PM
#66
09-07-2017, 02:42 PM
Hotshot
1. You already know from the IDM to injector #5 there is low resistance correct?
2. Unplug the 42 way connector and measure towards injector 5, is it still low? If not then the problem is between the other end of the 42 way connector and the IDM wiring. If it is still low then the problem is somewhere after the 42 way connector towards the valve cover.
2. Unplug the 42 way connector and measure towards injector 5, is it still low? If not then the problem is between the other end of the 42 way connector and the IDM wiring. If it is still low then the problem is somewhere after the 42 way connector towards the valve cover.
#69
09-07-2017, 04:11 PM
#70
09-08-2017, 06:53 AM
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Yes, he has already been through all of this and the problem seems to be isolated to the main engine harness between the 42 pin connector and the pigtail at the valve cover. You might be onto something with a crossed wire at the new pigtail and I'll bet that he has still not ohmed the main harness for that #5 injector from 42 pin connector to the pigtail.
I performed a CCT this morning, it failed on #5 and #8 with codes P1265 and P1278. Buzz test passed on all injectors. Lots of white smoke and running very rough. I've put close to 15 miles since #5 injector swap. I understand that it takes close to 50 miles to work all of the air out if the oil rails, but I'm not seeing any signs of improvement like I would have with previous injector swaps.
Am I looking at a wiring issue, injector issue or an IDM issue with the codes P1265, P1278?
#71
09-08-2017, 07:03 AM
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I haven't re-read all posts on both threads so .. if you did replace the external pigtail on that bank it's also possible injector 5 wiring has an internal short to the glow plug, just getting worse. Yes, with new parts I've heard of this happening although it's more common to be under valve cover issue. If you have another external pigtail I would just throw it in there with quick wrapped wire connections to verify.
Now i'm getting P1265 and P1278.
#73
09-08-2017, 07:11 AM
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I am not familiar with the codes but that #8 is a typical flag due to it's location at the end of the fuel rail and is not necessarily a problem. There is another one that throws as well but I'm thinking it's #3. Someone who knows that better should be able to help you with it.
#74
09-08-2017, 07:13 AM
I am so confused.
As I read this, I see you ohmed the UVCH alone. Based on your readings, it looks like you ohmed each wire alone from one end to the other. I'm thinking remove the solenoid from the equation by unplugging #5 coil inside the valve cover. Or... since the valve covers are back on, unplug the connector from the passenger side valve cover. Now... ohm out #5 injector at the 42-pin connector. You should see a dead open, but if you see ohms....
As I read this, I see you ohmed the UVCH alone. Based on your readings, it looks like you ohmed each wire alone from one end to the other. I'm thinking remove the solenoid from the equation by unplugging #5 coil inside the valve cover. Or... since the valve covers are back on, unplug the connector from the passenger side valve cover. Now... ohm out #5 injector at the 42-pin connector. You should see a dead open, but if you see ohms....
#75
09-08-2017, 07:23 AM
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I am so confused.
As I read this, I see you ohmed the UVCH alone. Based on your readings, it looks like you ohmed each wire alone from one end to the other. I'm thinking remove the solenoid from the equation by unplugging #5 coil inside the valve cover. Or... since the valve covers are back on, unplug the connector from the passenger side valve cover. Now... ohm out #5 injector at the 42-pin connector. You should see a dead open, but if you see ohms....
As I read this, I see you ohmed the UVCH alone. Based on your readings, it looks like you ohmed each wire alone from one end to the other. I'm thinking remove the solenoid from the equation by unplugging #5 coil inside the valve cover. Or... since the valve covers are back on, unplug the connector from the passenger side valve cover. Now... ohm out #5 injector at the 42-pin connector. You should see a dead open, but if you see ohms....
BTW, it was either the pigtail or the UVCH that fixed the P1316, thank you for your help.
