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  1. R

    L5P will barely start, then die Please Help

    Post 19, idle at 600, very low, 13K desired and actual furnished by the CP3. Are you saying that the ECM has upped the demand pressure because the idle needs to be raised to 700/750? Ignore this as being the cause of the engine running poorly?
  2. R

    L5P will barely start, then die Please Help

    Randy Anything new to report? I assume you still have the P0016 Cam/Crank correlation problem? And fuel rail pressure is unexplained for a barely running engine?
  3. R

    LB7 with 40 engine codes

    You removed the Quadzilla Stealth 2 that presumably allowed you to operate with no EGR. Is that tune still in the truck? If not what tune is now in the truck?
  4. R

    Block or head resurfacing?

    You will have to carefully check the block to make sure it is flat and in good condition. If the engine was crudded up, had rust, corrosion etc on the head surface of the block, you may need to have it surfaced. It's just something you will have to gauge when you tear it down.
  5. R

    PRND321 underline issue

    It kind of sounds like TCM, but that's a wild guess. I suggest you call Evan. He's a very smart guy and likely the shortest path to the solution of your problem
  6. R

    L5P will barely start, then die Please Help

    The pump seems to create the necessary pressure, but not the right pressure for 600 RPM. If the FPR was disconnected electrically, perhaps some other electrical problems, short to power, short to ground, etc, I would expect to see the pump at FULL PRESSURE, 25K or more, whatever these L5P pumps...
  7. R

    Coolant flush on the LMM

    My 2008 hasn't had a cap problem. I did run a 20 lb cap for a few years, but I didn't need that much pressure so put the old 15 lb cap back in. They're pretty problem-free as long as you change the coolant every once in a while.
  8. R

    L5P injectors require back pressure to operate?

    For LML injectors: The injectors require a minimum of 3 BAR (45 psi) of pressure in the return system. Pressure is maintained via a “Constant Pressure Regulator” at 4-11 BAR (58-160 PSI). Is the same true for L5P injectors?
  9. R

    2005 lly duramax map sensor/wiring issue

    Is there a specific value for this ohm test? Published somewhere?
  10. R

    Water intrusion

    My method is to use painters tape and cover as much of the suspected area as you think might stop the leak. Then apply water and see if the leak stops. If still leaking, increase the coverage area; if the leak stops, remove some of the tape, say 25%, and see if it begins again. If it leaks, find...
  11. R

    Crank no start no codes

    Here is some good basic information about our trucks. Look for the section for your vintage. Maybe something will catch your interest. Chevrolet-GMC Diesel Diagnostics - Oregon Fuel Injection
  12. R

    Coolant temp sensor

    See the attachment
  13. R

    Engine Oil Cooler Kits

    That might be a real winner.
  14. R

    LB7 fuel issues

    You didn't mention P0087, but look at the attached and look at what might be causing the problem.
  15. R

    P00F6 LML issues

    There are service bulletins for newer trucks that point to chaffed wiring harnesses. My guess that yours may have a similar problem. Any blown fuses?
  16. R

    06 with 80k on it. Drop in MPG

    And clean your MAP. Also check for boost leaks.
  17. R

    Slow to turn over...

    Remember that battery cables (all circuits) have 2 connections and both of them are critical to good power.
  18. R

    Accelerator replacement

    I don't know about you but I just HATE it when people try to cheat me. Your choice as to what you do. At least it's better in some aspects vs what you already have.
  19. R

    2003 2500hd rear end shaking/vibration

    Put the rear axle up on jackstands so the tires are off the ground 2" or so. Put it in gear and go to the RPM or speed where you feel the vibration. Someone needs to observe the driveline, tires, and anything for visible signs of vibration. Be careful you don't personally get wrapped up by the...
  20. R

    Engine temp started to climb during last trip

    Try pulling in 5th gear. You will get the same mileage, but a little more power and driveability.
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