Hey guys, have an interesting situation here i could use some help on. The truck in question is my 1996 F350 (in my sig) and was running without any problems that i am aware of. I have towed my 8k lb camper without any issues over the few months.

A couple of weeks ago i tore into the truck to replace the inejctor o-rings to resolve excessive smoke at start up, no other issues. When i took the VC's off cranked the truck to ensure oil was spurting out of the deflectors... to my surprise injector #1 and #4 did not have any oil coming out. Chalked this up to o-rings and proceeded with the project. I got all of the injector re-oringed, took my time, used clean oil, i know for a fact i did not rip or tear any of the o-rings, however, one of the large pink ones that came in the kit from Alliant (all purchased from Riffraff) had a defect to it. I proceeded with the install as i needed my truck back and couldnt wait a week for a replacement to come in. that injector is #2 right now. continuing on i put the injectors back in and went to test crank it to make sure everything is working. Get the truck cranked and noticed oil leaking down the back of the head. investigate further and inj #3 has no oil coming out of the deflector but a ton of oil coming out around the body. I pulled the injector 2 or 3 times to ensure the o-rings looked fine and it seated well in the block. finally decided to tear that one injector down and clean it thinking maybe something got stuck and allowing oil to just pour out. this seemed to do the trick and now the injector is squirting oil like the others and not leaking out the back of the head with the VC's off. In investigating this issue, i thought maybe the injector is not firing and that could be the cause of the oil so i ran a buzz test with AE. I noticed that injector #3 was noticably more faint/quiet during the test. Also, I received the below fault codes:

P1271 - Cylinder 1 High to Low side open
P1272 - Cylinder 2 High to Low side open
P1273 - Cylinder 3 High to Low side open

Doing some reading i found i needed to do some electrical testing, I first just replaced the UVCH's, all 4 from Ford. I tested the VC gaskets and they all tested fine and no burnt pins. then i swapped the solenoids from inj #3 and #5 which the issue followed the solenoid, but all others sounded fine/the same.

So today i go out to continue troubleshooting and also ran the Cylinder contribution test and get the below results:
Cylinder 1 2 and 3
Injector circuit contribution / balance fault
P0263
P0266
P0269

I have to assume these are related and they sure seem to be electrical in nature. I am not exactly sure where to go from here and what to troubleshoot. Its also weird since the truck was running perfectly fine before. no i did not run any diags on it before starting bc nothing was wrong.

Thanks in advance - Jason

 

https://www.ford-trucks.com/forums/1...load-test.html

pic of wiring to test out harness there

Orings wont clear up smoke on startup. possible you have a glow plug burnt
Can ohm them out while in there too. Should be around 1 ohm

 

yup, sorry, i meant to add that in. Yes i tested the harness without any issues registering 3.4ohms (i used the GB version; HERE) but didnt try the headlamp idea. You think i should go back and do this test again?

i also replaced all 8 GP's with motorcraft as i had one that was stuck and ALMOST lost it in the head (dodged that bullet).

 

After it warms up today..... Does it run the same now as it did before you tore it down?

 

at idle, yes it seems to run like it did before... i took it for a test drive though and it smokes like crazy (white smoke mostly)

 

Sounds as if your issue is not with the fuel system.

 

are you losing coolant?
when was last compression test done?
what does it smell like? the white smoke

 

How long have you ran the truck after the work?
WHen doing injectors all oil and fuel gets drained into the cylinders, then some makes its way to the exhaust, it takes a while for it to clear up, well as long as the engine isn't knocking when it's smoking

 

not losing coolant and no diesel in coolant so far but then again i have only driven it about 5 miles. i have let it idle for about an hour total since starting my troubleshooting. I only get the heavy white smoke when driving it and getting into it. it doesnt smoke much just idling but it does smell a little extra diesely to me.

i have not completed a compression test.

i am about to test the IDM wiring harness again in a little bit and will post my results.

 

Jason, for those codes I would skin the harness back at least 6in from the plugs and inspect. I have found more wires rubbed through like that. Not burnt, but rubbed. Tried to text you brother but looks like your # changed.

 

ok just ohm'd the IDM connector three more times and they all ohm out within specs!

Thanks RubberDuck, thats a good idea, i will do that. yea my number changed, i will PM you my new number!