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  1. J

    LLY: fuel usage

    Replaced the ECM for the U1016 code .. now getting a solid 14 MPG. better than 11 but I really expected a bit better from this rig. My theory being that the FICM did not know the correct engine temp.I also noticed that the EGT temps are now approx 200F lower. Seems that the dual zone HVAC...
  2. J

    LLY: fuel usage

    Thank you Joshd472. Now I have a base line or perhaps a goal. ECM had a u1016(code ( not logging into the network) sent it off for a rebuild to A-1 Cardone on Jan 19th LSS (long story short) They dropped the ball and I just put in a brand new ECM which cleared up the code (U1016) and eliminated...
  3. J

    LLY: fuel usage

    Is approx 11 MPG all I should expect from this rig??/ I have "heard' that it should be doing 15 to 16 MPG. I have also seen a post that claims 11 is pretty much normal for these rigs?? Any input from you will be helpful. Thanks in advance.
  4. J

    LLY EGR delete codes

    You did not state the numbers on the two codes it is flaging. Usually the codes relate to a difference between the actual EGR position and the desired EGR position. most of those codes can be corrected by removing the EGR valve and cleaning it. What happens is the pintle gets stuck because of...
  5. J

    LLY: fuel usage

    To the best of my knowledge no other mods have been preformed. However I suspect that it may have had a tune put on it as the mil will not come on. A friend with a scan tool with Bi/Di commanded the MIL to come on and there was no response. How can I tell if it has had a tune installed?
  6. J

    LLY: fuel usage

    2004.5 GMC just purchased used. I am the 3rd owner. First trip out got almost 10 MPG. Discovered the Turbo unison ring was locked up due to rust. Replaced the turbo now it squeezes almost 11mpg. Disired and actual fuel pressure match. Injector balance within + - 2 at idle in park +- 4 in...
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