Peterbilt 379 Missing and shaky idle

Discussion in 'Peterbilt Forum' started by Easton379, Mar 22, 2024.

  1. Troy_

    Troy_ Road Train Member

    1,003
    6,611
    Dec 13, 2017
    Roma, Alberta.
    0
    They decided to warranty the injectors at first because I found out they had a bad run of reman injectors about the same time my inframe was done. They confirmed that there was in fact a bad batch and decided to warranty them. When the mech came to our shop to replace them, he stuck a borescope down to have a look and every single injector seat was irregular. They are supposed to seal with carbon deposits after a certain period of time, mine were blown out like a cutting torch was burning the iron until it finally burnt the seat right out on one hole. They replaced head and all injectors. It was actually a post in a thread I started here on TTR that turned me on to the bad injector/poor seat machining issue. I joined here just for that reason, to see if anyone else had that issue. My engine was a C-15 6NZ in an '02 T-800.
     
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  3. Easton379

    Easton379 Bobtail Member

    7
    3
    Mar 22, 2024
    Colorado Springs Colorado
    0
    Ok my mechanic is going to pull all the injectors and take a look and see what’s going on. I will let you know if I have the same issue
     
  4. Easton379

    Easton379 Bobtail Member

    7
    3
    Mar 22, 2024
    Colorado Springs Colorado
    0
    We finally got it in the shop today and found that O-rings were broken on four injectors. He did a compression/leak down test and all the cylinders held air fine. Liners one and six have some scratches but nothing too horrible yet we put new O-rings and put it back together and the shake is gone and there was no miss bobtailing back to the yard, I will run a load tomorrow and see how it does. Hopefully that was my problem.
     
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