Well I'm on to solving my next problem. I was towing my travel trailer up a mountain pass when I started losing power. Once I crested the pass, the symptoms seemed to disappear, so of course I figured it "healed" itself so I kept going. I pulled off the highway 15 minutes later, I noticed a significant engine miss and loss of power. When I stopped, I then noticed LOTS of white smoke from the exaust. I limped it in to a gas station and had the truck towed home. Currently the truck starts fine, with lots of smoke but the engine has power loss. There is no loss of coolant and it smells fine, so I assume no fuel contamination. The oil level is full, looks like oil with 2K miles on it, and is not frothy. I'm ruling out a headgasket issue, and am leaning toward an injector not functioning correctly. The injectors have 179K on them, and I just replaced the o-rings like 3 months ago. Looking for any advice for trouble shooting the problem further.

 

If your UVCH plugs look good then if you can do a buzz test. Any codes?

 

The UVCH plugs were good to go. I don't have a diagostic tool so I mayay need to invest in one this week.

 

Did you ohm the UVCH ? Or just look at the plug at the valve covers ?

 

I haven't ohmed the UVCH yet. Will do so tonight. I believe the outside prongs are for the glow plugs. Which prong do I ohm for injectors? What reading should I be looking for? Thanks again.

 

G-I-C-I-G
G= glow plug
I= injector
C= common/ground

Injectors should be around 3.5
Glow plugs no higher then 1.5

 

Thanks. I will Ohm out the UVCH pins tonight. Last night I did check the harness where it plugs into the IDM. Each ground circuit Ohm'd to 3.2, which is within spec. I then checked the IDM ground circuits and Injector Ground shied and they were within spec. I checked my fuel filter bowl, and the fuel is clear. Cleaned the FPR screen which was gunked up a bit. I'm going to keep fiddling with it but will drive it to my local shop and get a good diagnostic on Friday. It will drive just not fast. Other than smoking out the neighborhood is this a bad idea... lol?

 

Some sort of injector issue I would think. Possibly a cracked nozzle. Sounds like its time to have the injectors gone through in any case. I wouldn't drive it to far. If there is that much fuel hitting one cylinder bad stuff could happen. See if the crankcase oil smells like fuel.

 

I'll sniff the oil tonight.... Maybe it's time for Stage 1's? I hoping so. HA HA HA HA

 

Checked the UVCH pins with a volt meter. GP's at .6 to .7 ohms all cylinders. Inj pins were open circuit on all cylinders. I believe GP should read 1.5 and Inj should read 3.2, so it looks like wiring issues under the cover. I find it wierd both sides would go at the same time, or is that normal?

 

I found an exaust leak where the downpipe meets the 4" exaust pipe. There is trace amounts of oil blowing out of this exaust leak. Would a bad UVCH or injector issue allow enough oil to make its way that far down the DP. Could this be a blower issue?

 

If your oil is full i wouldnt think you be loseing oil from the turbo. Maybe you caught it befor it lost too much. Pull the down pipe off the turbo and check for oil in there. As far as the injectors, how did you ohm them. I belive you are sopost to have one lead on the injector and the other on the center pin not ground.

 

Thanks Stainless. I was using the neg batt terminal for ground for Inj. Using the C pin for ground... the Inj ohm at 2.8 -2.9 all eight injectors. GP still at .6 to .7 for all 8 glow plugs, using neg bat terminal. No reading for GP when using C pin. Dropped the down pipe and it's coated in oil on the inside, so is inside of turbo exaust. There is oil under the turbo pedestal.

 

Just pulled the injectors. O-rings look good to go, but the nozzles are black and have burned oil build up... like a fouled spark plug. Would this indicate an internal injector problem, or something worse?

 

I know you are all tired of my questions... Hopefully these pics will help diagnose the problem. Turns out the last three injectors pulled look like the smoking gun. Here's a pic of all eight.



Now here is a pic of the four pulled from the passenger side. Note #5, #3, and #1 injectors are definitely charred, and their orange O-rings have turned black in color.




This is the #1 injector. The orange o-ring (it's now charred black) is chipped.



Here a comparison of injectors that look ok, with those that are charred.




Here is a close up of two charred injectors.



What are your opinions of what's happening? Head gasket failure? O-ring failure on three injectors? Three injectors went bad at once?

Also this is my first time posting photo's so I hope they turnout. Kudo's to my daughter for taking the closeups!