Results 1 to 4 of 4

Thread: need a little lly help

  1. #1
    Junior Member
    Join Date
    Apr 2007

    Default need a little lly help

    Installed a Fass lift pump, new CP3, blocked the FPRV, deleted the factory filter and primer, ice picked all injectors, checked all wiring harnesses and still not starting. I didnt have any white smoke when it was running. My injectors arent great but I dont think its bad enough that it wont start?
    #1 -5.83
    #2 -3.17
    #3 +2.92
    #4 +1.58
    #5 +4.61
    #6 +1.89
    #7 +0.94
    #8 -3.25
    I did have something weird happen after i installed the CP3 I turned the trucks power on so the lift pump would prime good. I had a fuel puddle under the truck after I cleaned tools up. I checked around to see where the leak was, I had accidentally unhooked the return line from #8 injector to the junction block feeding the main return line. Fuel was dripping out of the return junction block between the FRPV and Turbo so that would mean im having return through the passanger side injectors. Is this normal in a key on position? no returns out of the right hand bank at #8.

    1. I have a few injectors on the way to replace #1 & #5 do you think this will solve the problem?
    2. Are efilive balance rates correlated to the cylinders or is it based of firing order? Do I replace #1 & #5 cylinders or #1 and #4 cylinders?
    3. Am i missing anything else?
    4. Should cylinder compression be around 350psi or 300psi minimum?

    Im off Friday so ill do the return rate test and check compression before I replace injectors.

    Thanks for your help
    2005 GMC Sierra ec/lb LLY - stock-

  2. #2
    Lifetime Member THEFERMANATOR's Avatar
    Join Date
    Mar 2009


    Without knowing what the fuel rate and engine temp was when these balance rates were taken, they are worthless numbers. #5 could be your best injector, or it may be shot. Without the fuel rate to figure ACTUAL balance rates, theres no way to know. And for reference, I had a truck with 3 hung injectors with PERFECT balance rates. Finally it quit starting all together and hydro locked. When you added in the difference for the fuel rate all of the balance rates sucked. They went from +/-2 to -5 to -9.
    1995 GMC 2500 SUBURBAN powered by 01 DURAMAX/ALLISON, little of this, a little of that,
    DIAMONDEYE 4" exhaust, CORSA muffler, AFE stage 1 dry filter, custom tuning by me, KENNEDY single pump and pump rub kit.

  3. #3
    Junior Member
    Join Date
    Apr 2007


    Ok, well ill try the return rate test and go from there then. Thank you
    2005 GMC Sierra ec/lb LLY - stock-

  4. #4
    Junior Member
    Join Date
    Apr 2007


    Replace #2 and #8 and #1 based off return rates and it runs awesome now. Everything balanced back to .00 to 1.10 including #5.
    2005 GMC Sierra ec/lb LLY - stock-

Similar Threads

  1. 2004.5 LLY can I use 2006 LLY tunes?
    By Badass_chris in forum Duramax LLY
    Replies: 4
    Last Post: October 22nd, 2012, 04:16 AM
  2. 05 LLY Help
    By jarasic in forum Diesel
    Replies: 2
    Last Post: August 9th, 2010, 09:17 AM
  3. LLY - Just do what I say!
    By GMPX in forum Duramax LLY
    Replies: 16
    Last Post: May 19th, 2009, 10:29 AM
  4. 06 LLY with six speed ??
    By weazel132 in forum Duramax LLY
    Replies: 3
    Last Post: October 27th, 2006, 09:39 PM

Posting Permissions

  • You may not post new threads
  • You may not post replies
  • You may not post attachments
  • You may not edit your posts