lly

  1. S

    Lly no start after engine swap

    Got a shit show of a lly, story goes as follows. Had blown hg for years and motor finally let go, they swapped motors to a used one, couldn’t get it running come to find out motor was apart and never reassembled completely. Then a different guy took it down to short block and half way assembled...
    • Sethdavis09
    • Thread
    • ecm lly no start tcm
    • Replies: 1
    • Forum: LLY
  2. H

    LLY loses fuel rail pressure after it warms up

    Hey There, the problem started when I was pulling my trailer down the highway and noticed a lack of power and black smoke. When I got back home I used my CTS 2 insight to show me the desired and actual fuel rail pressures. When I first start it after a couple of days and drive it, the desired...
    • hottlead
    • Thread
    • fuel pressure lly
    • Replies: 3
    • Forum: LLY
  3. P

    Need help please.

    I have a 2005 Gmc topkick 4500, with a Duromax engine. The vin code called for a LLY engine, bought a used engine, placed in truck, will not run right, like its in Limp mode. The truck is a Bucket Truck, I am being told the truck was not a complete vehicle from factory but a cab chassis. So the...
  4. E

    Built Transmission Issues

    I'm about at my whits end with my built trans. Had it built in March of 2022 and ever since I've been chasing a leak from the bellhousing area. Shop that built it had been great about trying to fix it under the warranty but it still leaks. They resealed the whole trans the last time they had the...
  5. L

    Lb7 Ficm to a LLY Motor

    I currently have this nightmare of a 05 lly and the ficm decided to go out. I have sent the ficm off to be repaired but was just informed that it was unrepairable so now i have been looking to find a new ficm. I have been looking all over for weeks to find a lly Ficm that isnt $3000 and just...
    • lly1998
    • Thread
    • duramax ficm durmax ficm lly lly wont start
    • Replies: 2
    • Forum: LLY
  6. T

    LLY P0089

    Hi all, So I’ll start from the beginning I recently took everything apart and powder coated everything I could. When I did that I replaced the alternator and I have a PPE duel cp3 pump. I didn’t notice the hardline for the duel fueler was touching the hot on the back of the alternator. Slightly...
    • Tunamaxx
    • Thread
    • lly p0089
    • Replies: 3
    • Forum: LLY
  7. T

    Don’t know where this plug goes?

    I’m unsure where this plug goes. When I took my truck apart I thought I labeled every plug but this one was missing one. The plug comes off the main harness and one plug goes to the sensor under the harness bracket and not sure where this plug goes.
    • Tunamaxx
    • Thread
    • lly
    • Replies: 12
    • Forum: LLY
  8. K

    Anyone switch LLY to LB7?

    Hi All, I have a 2005 Duramax with a blown LLY, I have a salvage truck the has a LB7, the motor is out of the LLY already and at this point I am looking to find out if it is possible to do the swap considering the difference in the fuel systems. Does anyone have a clue on this?
  9. dmaxerLLY

    stock LLY turbo dimensions. looking to upgrade on a budget.

    before i get blasted.. yes i tried searching with 0 results. im a DIY guy i can mig, tig and fabricate everything neccessary myself. ok im assuming T3 on the turbine inlet flange of the stock turbo? i would love to stuff a s466-83/74 1.0ar in the lly with an adapter flange to T4 if its...
  10. S

    Will new nozzles correct balance rates?

    I have a knocking sound at about 1500 RPM's. I pulled the Balance rates and I have 2 injectors that are over +-4 (neutral brake applied) one is 4.44 the other is -4.8 (sometimes spikes to -6) and there are two that are pretty close. +3.8 and +3.53. Will replacing the nozzles with some like...
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