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To start this is my first 7.3 PS and I am learning as I go.

After weeks and weeks of trying to diagnose what the issue is with my truck from replacing ICP, IPR, UVCH's, oil/filter replacement, fuel filter replacement, PCM test, buzz test, replacing engine wiring harness, replacing GP's, new batteries/cables, starter, cleaning every ground and having the valve covers off 5 times I find now that none of my injectors on the passenger side are getting what I think is the right amount of oil. Funny thing is IPR duty is only 11-12% idling and 22% under 1/4 pedal. HPOP pressure is 612-636 psi idling and 2280-2810 at 3/4 pedal.

When I first start the truck it idles very erratic, HPOP bounces from 600 to 1100 and idle rpm jumps in harmony with HPOP from 710 to 1100. After about 1 minute of doing this it smooths out and idles 710 rpm HPOP 636 psi. Push the gas pedal down and it slowly, missing and shaking the truck climbs up. Thinking this was an HPOP or oil leak issue I watched IPR duty cycle from cold start to operating temp and it does not climb and HPOP pressure doesn't plummet.

I decided to pull the valve covers last night to inspect the injectors (truck running)and I find the injectors on the driver side are dumping oil out excessively and the passenger side has drips coming out. Driver side was so much as it's running oil was being sucked up into the turbo from the back injector. Also a lot of smoke from the motor out the holes in the heads.

Truck idles terrible, has no power unless above 2000 rmp, misses and bounces and struggles to get there when pedal is pushed. If you release the gas pedal truck sputters and dies. PLEASE PLEASE HELP. MY FATHER IN LAW IS DIEING OF CANCER AND WE ARE TRYING TO GET THERE TO SEE HIM. THIS IS OUR ONLY VEHICLE AND THE TRIP IS OVER 1200 MILES FROM VA TO MO. GOD BLESS YOU ALL!!
 

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To give a little more info I traded for this truck and it was not running when I got it. I have 0 experience with the 7.3. The previous owner had installed the wrong pedestal and up pipes so I bought the correct 99E pedestal and up pipes. I then got it running but has always ran terrible. That's when I started replacing the parts with the info a local shop, forums and videos told me what could be wrong. I have 0 info on what has been changed, added or is aftermarket on this truck from previous owner. He vanished after the trade. From what I can tell or guess it looks like someone has done upgrades. It has a TS 6 position chip, 4" downpipe with straight exhaust, what looks to me like an aftermarket turbo and wheel and intake. I will attach photos of the injectors and turbo...maybe someone can tell me if they are aftermarket. I bought a bluetooth OBD2 and have Torque and Car Gauge Pro.

Sense I got this truck my family has been thru a lot. I have lost my business/house due to covid-19 and my father in law is battling cancer. We were planning on moving to help him with his cancer treatment and appointments and recently got news it's not curable/spread and he is dyeing. We don't have a lot of money and this truck is the only vehicle we have left. If you have any idea what is happening with this truck or what could be causing this please let me know. Thank you in advance. This is pretty much my last hope
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I still think bad injector o-rings could cause this. Especially now that you've mentioned the driver's side is getting plenty of oil. The reason is, the ICP sensor only detects pressure on that side. If the torn o-ring is on the passenger side, there will be no oil pressure over there and the ICP sensor will never know about it. PM me your address and I'll even buy the orings and have them sent to you. It's not a terrible job and there are plenty of tutorials out there. Here's one - https://www.riffraffdiesel.com/cont...el_7.3L_Injector_Replacement_Instructions.pdf
 
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RT thank you so much. I don't know what to say. I will send you a message now. THANK YOU THANK YOU!!
 

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Like rt said pull injectors and check o rings if you don’t find bad o rings I would send injectors out to have flow tested. Have you tried to do the buzz test.


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I got the test PM - now send one with your address.
 

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Here they are. O-rings look like garbage and 6 & 8 have some massive gunk on the end. Very gritty. Also the end of #2 looks different then all the others.
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Well, I don't see any that are in pieces, but they are originals so they need to be swapped out. New o-rings are on the way UPS next day air.

Try to suck all the oil out of every cylinder with whatever suction device you can come up with - turkey baster - whatever. Pull the glow plugs. Once you get the injectors re-ringed and back in, turn the engine over two full turns using a wrench on the front damper. Then, with towels over the valve covers over the injectors, bump the starter a few times, then crank it for a few seconds. Now - this is important. Plug all the wiring back into the injectors and plug the 42 pin harness back together temporarily. Crank it over like you are trying to start it. It won't start obviously because the glow plugs are still out but listen carefully for the motor to load up slightly. This is the HPOP repriming the high-pressure oil rail. By doing this, you will be able to start the truck immediately upon putting everything back together. Otherwise, you'll spend hours cranking against the full compression of the pistons trying to get it to start. You don't need to burn up a set of batteries right now.
 

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Discussion Starter #11
I cant thank you enough. No none of them are in pieces. Should I be looking for something else?
 

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Other thing I noticed and don'/t know if this is right or if it matters. All my injectors numbers on top start with AB including #8. Shouldn't #8 read AE or does that not apply for 1999 early?
 

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AE was introduced on the 2002 as a cure for low oil and fuel pressure #8 sees as it fires immediately after its neighbor. Your 99 wouldn't have that unless someone took it to the dealer complaining of cackle.

When you get them back in and crank on it, check the high pressure oil plugs under the valve cover on the passenger side to make sure it isn't leaking.
 

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RT, great thing you did there. If we ever meet I'll buy the beer.
 
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What Greg said. (y)
 

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One other thing I did notice and never using the Torque app or have any experience with this type of truck I don't know if this is a big deal. I was monitoring the throttle positioning sensor while running and the digital display for it was bouncing all over the place from -0.025 to 0.6635+ while idling. Could that have something to do with it?
 

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and like Greg687 said....I will gladly buy the beer and bbq if we ever meet. Thank you all so much for the help!!!
 

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Just my luck- I don’t drink. .

The way to rule out the throttle is to use the cruise control on a test drive. If that clears the issue, you can condemn the pedal. Still, I don’t see how the tps could lead to oil only flowing on one side or a rough idle. The value may be jumping around as a response to the rough idle.


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So on still trying to figure out this out issue I started checking the lines from the HPOP to the head and found the line at the HPOP totally loose. Like finger turning loose but no signs of oil leaking. I then decided to pull the line and check to see if it's stripped or blocked and this little spring and plate fell out. Is this an issue? Line was clear and o-rings look good.

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The HPOP lines have quick disconnects on the ends. If the part that was turning freely is the round collar (not the hex plug that screws into the head), that is probably normal and not a concern. I think the spring plate is probably a check valve and should go back in with the spring toward the head and the plate toward the HPOP line. I never pulled those off on my engine, so I am not 100% sure on the purpose of the spring plate, but a check valve would make sense..
 
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