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  1. H

    BOGGING BADLY! - SOLVED

    You can also try driving down the road in a safe open stretch, then pop the truck into neutral and let it coast without touching the brakes. Nothing to do with the converter, but another test to see if something in the drive train or brakes is dragging it down. You would think you would feel it...
  2. H

    BOGGING BADLY! - SOLVED

    Yeah. Trying to think of things that can load the engine down at low rpms. I am not sure with a 6l80 if it would stall the truck, i have never tried locking the converter at idle on a 6l80, but I have had a customer car with a 4l60 that had a converter solenoid fail, and it loaded the car down...
  3. H

    BOGGING BADLY! - SOLVED

    Something else to try. Fire it up, put it in manual mode first gear, then with your vcm special controls function, go into tcc (torque converter controls) and hit the converter on button. Make sure you aren't pointing at a garage door and that you are ******* the brake incase it tries to pull...
  4. H

    BOGGING BADLY! - SOLVED

    You are not wrong, but it also depends on if it has an air intake or any mods. I have seen them run bone stock in the .56 range, but also .70 with air intakes. It all depends on how the torque model is scaled for mods and vehicle weight, but there is just no way it should be into the .56 range...
  5. H

    BOGGING BADLY! - SOLVED

    Be safe and at least wrap some electrical tape around the connector before pumping, it has a bit of a kick to it. Ideal would be to get a hose clamp on there. I can't tell you how red neck to be.. I get pretty darn redneck sometimes. Safety first or second
  6. H

    BOGGING BADLY! - SOLVED

    Just another thing to add to the list, all we can do is spit ball here. You sound like you have a really good grasp on things, it is the most fun to figure something out when it takes some thinking. You can pop your fuel feed line off in the morning then run a rubber hose to some Jerry cans...
  7. H

    BOGGING BADLY! - SOLVED

    Lol, is your park brake on? Hahaha
  8. H

    BOGGING BADLY! - SOLVED

    Only other thing I can think of is a heavy contamination in the fuel you get. Not sure if you tried a different station yet, but it's not unheard of to have something super bad with a tank of fuel. It would be showing misfires like crazy if that was the case, so I doubt it. Anywhooo. Send me a...
  9. H

    BOGGING BADLY! - SOLVED

    . 56 is exactly where it needs to be at full throttle eventually, but it shouldn't be hitting that point when you are low rpm trying to get full throttle. It is a symptom, not the problem. It's a chicken and the egg thing most times with efi trouble shooting. If your exhaust is plugged, and you...
  10. H

    BOGGING BADLY! - SOLVED

    It isn't your knock sensors. Is it still loading to .56 grams per cylinder when you get into it?
  11. H

    BOGGING BADLY! - SOLVED

    I have been tuning since ls1 edit in 1998 and have over 4 thousand tunes on hp tuners alone. I have a really good idea of what to scan to nail it down if needed. See how the plugs go
  12. H

    BOGGING BADLY! - SOLVED

    Ha! I missed the last post with the broken plug. That should be it, but if not, I will build you a custom scan profile with everything needed to nail it down. Your logs no matter what you are doing, should always have current misfires 1 through 8 no matter what you are doing. It would have shown...
  13. H

    BOGGING BADLY! - SOLVED

    Sorry, missed you logged fuel pressure. It's 43 when you hit it, what does it do as you went further into the log?
  14. H

    BOGGING BADLY! - SOLVED

    J91z is correct in the loading being off on that hp tuners scan. You will never be able to hit .56 grams per cylinder at 2 thousand rpms under normal conditions unless you have a trailer behind you and floor it from a dead stop. It isn't false knock because it is going right into a load range...
  15. H

    3.5" Exhaust for 2018 Tahoe 6.2L?

    The factory 3.5 inch moves plenty of air. One of my trucks runs a single turbo 416 stroker through a factory 3.5 exhaust and muffler (no cats or y pipe,) and makes 900 hp. I am building a single turbo srt10 right now that is way bigger of an engine than the 6.2, and will make around 1000 hp, and...
  16. H

    Sounds Like Lifter Tick but Rockers All Moving

    A customer brought me a 2015 last year with a tick and rough idle. Did compression test, pulled the valve cover and watched the rocker movement, and everything checked out perfectly. When I took it apart the cam lobe on number 4 was slightly pitted. You would never think it would be enough to...
  17. H

    2008 tahoe 5.3l in need of desperate help

    What cam did he use for the dod delete? They will misfire if he put a dod cam back in with a dod delete.
  18. H

    Cool engine cover

    First thing I do is rip off all the engine and coil covers on my vehicles. Never had someone care to look under the hood on stock vehicles, and if they did, I still would take them all off for engine health. The killer of coils is heat, not to mention retention of overall engine heat for reduced...
  19. H

    2018 Yukon SLE Rough Idle/Pulsating idle

    There is no idle control valve on a 2018, it just opens the throttle blade to adjust idle air. Assuming the tune is stock and someone didn't mess any settings up, it sounds like a textbook vacuum leak. When you first start the truck, it holds the throttle open a pre-set amount. If you have a...
  20. H

    2010 DENALI 6.2 Motor "Seized"

    Pull your spark plugs and turn the engine over by hand. I have seen it before that a head gasket went and filled a cylinder with coolant. The engine would turn over part way in both directions before locking up, exactly like yours. I actually thought the engine had a broken crank or rod or...
  21. H

    My '02 Tahoe L59 revs WAY too high on cold start ups. Anyone got any ideas?

    Oh, and tps as well to make sure there isn't something wrong with it and it's showing more than 2 percent throttle at idle. If it is reporting more than 2 percent, it will kick it to the part throttle timing map which has higher timing and also throttle adders via the iac that will hang the idle.
  22. H

    My '02 Tahoe L59 revs WAY too high on cold start ups. Anyone got any ideas?

    Like others have said, you need to get a scanner on it. At warmed up temp you want to see the short and long term fuel trims, the IAC duty cycle, the engine and air intake Temps, and the rpms. There are others that can help further, but those are the important ones to get it almost for sure...
  23. H

    My '02 Tahoe L59 revs WAY too high on cold start ups. Anyone got any ideas?

    Absolutely. In this case it's possible it isn't able to go from its more open while cranking position, to less open right after it fires. It should never be open enough to flair to 2500 if the tune is stock though. On some gnarly vehicles I like to make them crack ******* cold starts and hop up...
  24. H

    My '02 Tahoe L59 revs WAY too high on cold start ups. Anyone got any ideas?

    Not trying to be THAT guy, but the more likely culprit would be that the pintle is restricted from closing quick enough after start up. With the added fuel of the cold start enrichment based off the coolant temp adder, the truck would rev high if the pintle was stuck more so outwards away from...
  25. H

    My '02 Tahoe L59 revs WAY too high on cold start ups. Anyone got any ideas?

    And this would be super easy to figure out with a scanner and logging the idle air duty cycle. If it's a vac leak, you will see the iac counta drop way down, probably right to 0 with a leak this bad if it is a leak. The iac will close as far as it can, then the truck will start pulling timing to...

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