Attention: TDR Forum Junkies The Friday before last I thought I had either lost a tip or cracked an injector body. While driving on I40 the truck started to miss followed by a cloud of black, then blue, then white smoke. I didn't see any spike in the EGT's at that time and unfortunately I wasn't looking at the rail pressure gauge. From beginning to end the truck only ran for about a minute with no load before it was shut off.
So loaded it up on the trailer and hauled back it back to the house. Ordered the Miller specialty tools and pulled the injectors. Looking at all 6 every one but #3 were similar. It was brownish black. Unburnt fuel?
Below is a bad picture of one of the good injectors. Relatively clean with some carbon deposits.
#ad
Here's a picture of #3. The tip is a solid brown with no metallic coloring.
#ad
With the help of Performance Diesel Warehouse I had the injectors sent down to Formula 1 to test and modify to Flux 1's. However when they were tested all were functioning properly. I thought maybe the needle had stuck and was jarred loose during shipping (not likely at all) or the TST had messed up.
Before reinstalling the injectors I got my hands on a boroscope and peeked into each cylinder. #1,2,4,5, and 6 looked brand new. Crosshatching and everything. #3 had a brownish coloring and some minor scoring. Mainly in the 11 to 12 o'clock position. There wasn't any pitting or defects on the top of the piston or the ring that I could see.
After putting everything back together, following the 05' manual and SAG2's write up carefully, I fired it back up. Initially it sounded okay with a little blue smoke (probably due to having it apart). The blue smoke then turned to black and then onto white. When the key was switched off the motor dieseled for about 5 seconds and during that time the white smoke went back to black.
So, pulled the TST off and installed the bypass plug. Fired the truck for about 20 seconds with the same result. Off comes the entire TST harness. I checked all of the factory connectors and tried it again to no avail.
After all of that I pulled off the injector harness for #3 & 4 and started the truck. Other than the missing on 3 & 4 everything sounded fine and the smoke quit. No dieseling when I shut it off either.
I took an Ohm meter and the electrical diagram and checked each individual injectors positive and negative and then combinations of different positives and negatives for shorts together or to earth ground. All 6 had the same readings.
So now I'm baffled. It doesn't appear like its the wiring/ECM, not the TST, and not the injector. Does anybody have any Ideas? I'd like to get this issue fixed before I start worrying about the scored cylinder.
EDIT****My dad was working on the truck today and fired it up. It ran nice and smooth for 2-3 minutes before it started missing and blew white smoke. There was no blow by or pressure/smoke coming from the oil fill at any time.
Thanks to Performace Diesel Warehouse for the help and Formula 1 for the quick turnaround.
__________________
So loaded it up on the trailer and hauled back it back to the house. Ordered the Miller specialty tools and pulled the injectors. Looking at all 6 every one but #3 were similar. It was brownish black. Unburnt fuel?
Below is a bad picture of one of the good injectors. Relatively clean with some carbon deposits.
#adHere's a picture of #3. The tip is a solid brown with no metallic coloring.
#adWith the help of Performance Diesel Warehouse I had the injectors sent down to Formula 1 to test and modify to Flux 1's. However when they were tested all were functioning properly. I thought maybe the needle had stuck and was jarred loose during shipping (not likely at all) or the TST had messed up.
Before reinstalling the injectors I got my hands on a boroscope and peeked into each cylinder. #1,2,4,5, and 6 looked brand new. Crosshatching and everything. #3 had a brownish coloring and some minor scoring. Mainly in the 11 to 12 o'clock position. There wasn't any pitting or defects on the top of the piston or the ring that I could see.
After putting everything back together, following the 05' manual and SAG2's write up carefully, I fired it back up. Initially it sounded okay with a little blue smoke (probably due to having it apart). The blue smoke then turned to black and then onto white. When the key was switched off the motor dieseled for about 5 seconds and during that time the white smoke went back to black.
So, pulled the TST off and installed the bypass plug. Fired the truck for about 20 seconds with the same result. Off comes the entire TST harness. I checked all of the factory connectors and tried it again to no avail.
After all of that I pulled off the injector harness for #3 & 4 and started the truck. Other than the missing on 3 & 4 everything sounded fine and the smoke quit. No dieseling when I shut it off either.
I took an Ohm meter and the electrical diagram and checked each individual injectors positive and negative and then combinations of different positives and negatives for shorts together or to earth ground. All 6 had the same readings.
So now I'm baffled. It doesn't appear like its the wiring/ECM, not the TST, and not the injector. Does anybody have any Ideas? I'd like to get this issue fixed before I start worrying about the scored cylinder.
EDIT****My dad was working on the truck today and fired it up. It ran nice and smooth for 2-3 minutes before it started missing and blew white smoke. There was no blow by or pressure/smoke coming from the oil fill at any time.
Thanks to Performace Diesel Warehouse for the help and Formula 1 for the quick turnaround.
__________________
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