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with the ICP unplugged the computer infers what pressure should be given other parameters. And tries to run based on that. Given that it reads 0psi connected and won't start unplugged I think it's safe to assume, that as tugly mentioned you have a big bad high pressure oil leak. Given that you haven't mentioned anything about your truck hemorrhaging oil like a gun shot wound, you're left with internal oil leaks.
So we're down to injectors and hpop. Since hpops rarely if ever die spectacular instant deaths, I would start with Tuglys comment above.
I definitely know for a fact that there is another injector oring that failed. I've got fresh oil in the fuel filter reservoir.
I'm waiting on the oring kit to show up. Tonight I'm going to ohm out the connections on the IDM just to check if there's any issues with that since I'm already waiting on parts.
I definitely know for a fact that there is another injector oring that failed. I've got fresh oil in the fuel filter reservoir....
That is enough to prevent a diesel with HEUI injectors from running. The injectors are oil powered, and the IDM signal is nothing more than a T-Ball coach yelling "NOW".
I had a similar issue, the Cody test revealed I actually had an injector internally fail, allowing the oil to dump straight out of the injector.
Before diving in and taking all injectors out and doing them, I would perform the Cody test to figure out exactly which one(s) is/are giving you grief. Will save you some time troubleshooting. I put together a blow gun similar to one I saw Rich post a picture of awhile back. Boy am I glad I did, made performing the test so much easier. I'll see if I can't grab a picture of it tomorrow.
"...distracted by a passing cloud." That was a good one.
Just remember to wrap a paper towel around the fitting before applying air. If the O-rings leak, you have little or nothing to worry about. If the O-rings are doing their jobs, you may be introduced to the flavor of oil when you release the blow gun.
I have a 99 7.3 cranks but no start.I have put a new IPR, ICM, checked fuses new batteries, changes fuel filter, new pickup unit in tank, and lift pump. I give up, anyone got any suggestions
I have a 99 7.3 cranks but no start.I have put a new IPR, ICM, checked fuses new batteries, changes fuel filter, new pickup unit in tank, and lift pump. I give up, anyone got any suggestions
You may want to start your own thread to look into this, it will get confusing to jump on this thread, they have a habit of "wandering" as it is!
I have a 99 7.3 cranks but no start.I have put a new IPR, ICM, checked fuses new batteries, changes fuel filter, new pickup unit in tank, and lift pump. I give up, anyone got any suggestions
That's the one! Thanks for posting that Rich. Mine had a few more fittings than that as I used a length of brake line vs copper tubing. I will also second the towel/rag around the tip suggestion. I forgot about it the first time I did it, boy was that a fun surprise when the gun shifted and broke the seal.
Turns out the injector I installed wasn't seated 100%. Now I have pressure, in fact it bounces around from 490-570 at through the ICP reading.
The issue still exists of diesel going into the crankcase though. If I'm getting pressure to the HP oil system then it shouldn't be going through the orings correct? I'm draining the fuel reservoir right now so I can check to see if the oil still backs up into the reservoir while it's running.
So your getting fuel into the crank case? I would have to venture a guess at one of three things. Very bad injector orings. Bad internal leak on an injector. Or cracked injector cup. Are you getting fuel into the coolant?
Loose injectors allow the copper washer to unseat, which allows combustion gasses/heat/pressure into the fuel and oil O-rings, as well as the cups - all bad juju. New O-rings are in order when the engine runs with injector hold-down bolt torque below 50 inch pounds (according to the book). According to my personal experience... yep.
What are these Alliant branded injectors? I plan on using Motorcraft when I switch them out but RiffRaff appears to only offer this brand. Are they good or bad or just find somewhere to get Motorcraft?
04-16-2017, 08:05 AM
