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  1. CPB

    2001 Tahoe high presure on low side of A/C

    Could be orifice tube, could be overfilled. That's definitely incorrect.
  2. CPB

    2001 Tahoe high presure on low side of A/C

    The pressure expected is dependent on ambient temperature, so check an r134a chart. It the clutch disengages and the compressor no longer spins, then pressure should rise. Some fake numbers as example. The high side will be around 175psi when low is 40psi. When the system is off it'll be at a...
  3. CPB

    My first GMT800, 01 2500HD LQ4

    It was time for a new pump setup, starting seeing contamination of the plugs, the level sender would become intermittent. Guess after 25 years it did well.
  4. CPB

    P0171 and P0174

    I'm a monster and just spray TB cleaner all over the fittings and intake to locate leaks.
  5. CPB

    NV4500 Transmission Fluid Research & Findings

    Wouldn't Redline MT-90 meet the specification?
  6. CPB

    Gear ratio

    You'll enjoy what most tuners are doing. Increasing shift pressures, shift timing and allowing PE to kick in sooner. Without PE the vehicle runs in closed loop, 14.7 as the target AFR and the according amount of timing. So it's pretty restricted, meets emissions and limits torque output to the...
  7. CPB

    Gear ratio

    Most of what folks accomplish with the tuning is removing the "limits" GM provides. Everything is about tradeoffs. Even decreasing the PE delay will result in less fuel economy and more overall drivetrain wear. You have to decide if the priority is power or conservativism with the goal of...
  8. CPB

    Gear ratio

    Time to disable some of the torque management and traction control. Do note these exist to protect the drivetrain from damage. However, it'll help with the burnout goal. The PCM pulls torque during potential wheelspin events by default. The other thing for burnouts is less traction, so run a...
  9. CPB

    My first GMT800, 01 2500HD LQ4

    917-108
  10. CPB

    My first GMT800, 01 2500HD LQ4

    The OEM ones are two separated flanges.
  11. CPB

    My first GMT800, 01 2500HD LQ4

    I'm not sponsored by Dorman, but maybe I should be. The right rear exhaust manifold bolt had long broken off in the head prior to my ownership. It's a common problem due to thermal cycling, mixed expansion rates of these three materials and the crappy GM fasteners. Installed this bracket to...
  12. CPB

    Inconsistently odd fuel delivery issues (I THINK?)

    I would measure fuel pressure if you're leaning towards it being a fueling issue.
  13. CPB

    My first GMT800, 01 2500HD LQ4

    Tried this a few weeks ago. That's a broken extractor. Took it to a local exhaust shop and they said, "You can't get those out!" I nodded in obvious agreement gesturing towards the broken extractor. They pointed me towards someone that could weld on the cast iron, since my goal was just a...
  14. CPB

    Features deleted by GM (gmt800 life cycle)

    Yeah, I just know when buying an exhaust manifold for a 6l 2500 that the EGR opening disappears when looking at the 2004 MY. Earlier years will still have it at rockauto or other parts stores. Even the GM OEM offering has the EGR provision prior to 04 on those websites.
  15. CPB

    Features deleted by GM (gmt800 life cycle)

    Not sure if on the list, but the EGR was deleted in 2004. (At least true for the LQ4, not sure how accurate on other engines.)
  16. CPB

    My first GMT800, 01 2500HD LQ4

    "It's not stupid if it works" Added a Dorman 800-196 check valve to the supply line for the fuel rail. -Dorman 800-196 -Female 3/8" Fuel Line Quick Connect Adapters to 3/8" barb (https://www.amazon.com/dp/B0B8ZWGBYS) -Male 3/8" Fuel Line Quick Connect to 3/8" barb...
  17. CPB

    2004 Tahoe dies randomly while driving.

    Regarding fuel pressure, just to echo the others. There is a spot on the rail for attaching a fuel pressure gauge. I'd route that between the hood and cowl so that I can observe while driving.
  18. CPB

    99 1500 4.8 oil separator options

    I use the radium kit for these trucks. It's got a nice bracket and a ball valve to bypass the can in case you forget to drain it during oil change.
  19. CPB

    Better reverse lighting ...

    I'm using these, but you can go much brighter. https://a.co/d/29Q4M9f The brighter option is just to use an LED headlight in the reverse socket. I did this with another vehicle using a GTR Lighting kit.
  20. CPB

    My first GMT800, 01 2500HD LQ4

    Just wrapped up doing about 2k miles of towing for the latest race. The bearing inside the 105A alternator is starting to make a serious groan, so ordered the ACDelco Gold #88864277 replacement that's listed as 130A. Figured that would give a little more buffer if I move to electric radiator...

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