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  1. R

    New build with issues

    Maaybe some assistance on the attachment
  2. R

    Rear Diff Fluid Change

    I would call that a seep, not a leak. Use some brake cleaner, thoroughly clean off all traces of diff fluid currently on the diff, and then watch it for a while. My guess is that you don't really have a problem. When you start seeing drips on the ground, then I'd tackle a repair. And like Chris...
  3. R

    P0113 IAT Error when LMM in Reverse

    The MAF and IAT sesnor is a 2 in one device. Both sensors feed a signal to the ECM, and the MAF signal goes to pin 5 on connector X-1 (the black connector) and the IAT signal goes to pin #42 on the same connector. It is a tan wire. Somewhere between the sensor itself and the ECM the signal...
  4. R

    P0113 IAT Error when LMM in Reverse

    See attached. Clearly you have a circuit problem. Exactly why the interface with being in reverse cannot be understood until you find the circuit problem.
  5. R

    Zero Rail Pressure when cranking

    Is is possible that the race plug is blocking the fuel coming into the fuel rail? Do race plugs come in different lengths? or use different thickness gaskets? You have your old plug to install and see if there is a difference? Cranking you should have about 4K - 5K pressure.
  6. R

    How long would you run these injectors?

    Please explain the column headings @5mm3 and @6mm3. I have never seen these used in connection with balance rates.
  7. R

    Bleeding a new master cylinder

    Like what?? Did you forget to add picture or link to tool?
  8. R

    How often to change serpentine belt ?

    It can be done without many tools, but it's a real pain to get the belt over and under all the different pulleys. If the weather is good, you are in camp, cold beer in hand and more in the fridge, not so bad, but if it's 115 and you are in a hurry, you're going to have a very bad day. I had a...
  9. R

    LMM: Connector directory?

    Here is the direct link to part #1 Source: https://youtu.be/QoIIkwxnt08
  10. R

    Electric fan clutch pinout

    LMM's do not have electric fan clutches.
  11. R

    Allison 5sp: Power steering oil cooler/pump selection

    This attachment will give you a pretty good way to bleed your steering. Covers more than bleeding, so look for that part, Page 4.
  12. R

    LMM: Connector directory?

    Go to Youtube and search for "lmm wiring harness" and you will see all the connectors for the wiring harness. I think there are 2 parts.
  13. R

    LMM: Oil Pressure help

    In your process of fixing the truck, did you remove/replace any of the sensor connectors? Did you check your oil to see if any coolant is present?
  14. R

    Low maf reading

    delete
  15. R

    Low maf reading

    And the low reference ref also. You have to have a steady 5v, and a good ground (low reference) in order to get an accurate MAF reading. The face that the reading is erratic tells me there is a circuit problem.
  16. R

    2009 LMM won't rev over 2k rpms.

    Please tell us what tools you used to figure this out. I suspect that few if any readers would have the time or $$ to be able to do the analysis you did at the shop.
  17. R

    2009 LMM won't rev over 2k rpms.

    I'm assuming that the DPF and CAT are not plugged? (unllikely) Have you scoped and looked at the waveforms for the MAF and Map sensor performance when this is happening? Have you scoped and looked at the waveforms for the LAN communications to see if anything abnormal happening there? Maybe...
  18. R

    Bad lift pump

    https://www.yourmechanic.com/article/p2635-obd-ii-trouble-code-fuel-pump-a-low-flow-performance-by-parker-hill
  19. R

    LMM Turbo Vane Sensor Ebay ?

    Our Duramax engines seem to do better with genuine GM parts. However, I understand that the aftermarket is much cheaper. I'd try an aftermarket and see if it worked, ONLY if I also understood I still might have to buy the GM OEM part, if the aftermarket fails.
  20. R

    LBZ: Batteries draining down

    Look on YouTube for videos pertaining to PARASITIC DRAW. Lots of videos showing different methods, tools, etc. South Main Auto is one of the best.
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