What did you do to your NNBS GMT900 Tahoe/Yukon Today?

Discussion in 'General Discussion' started by phattyford, Aug 26, 2012.

  1. wjburken

    wjburken Full Access Member

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    I thought I read somewhere that they went back to actual sensors on the K2XX platform.
     
  2. HiHoeSilver

    HiHoeSilver Away!

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    Possible. I've never looked into it.
     
  3. wjburken

    wjburken Full Access Member

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    I looked into a couple patents for VFFS systems and it’s kind of interesting how they can take a combination of known Stoichiometric ratios of E85, E10 and E0 fuels, fuel line pressure, injector settings and rich/lean measurements of the O2 sensors and is able to calculate the % of alcohol. It goes into a relearn mode when ever the system detects an increase in the fuel level in the tank.
     
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  4. HiHoeSilver

    HiHoeSilver Away!

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    Yeah, I read that it closes the purge solenoid and takes closed loop data to figure it out. It only goes into learn mode when it sees 3 or more gallons, which triggers a refueling event. I ran out if gas once and only had access to 2 gallons of 87 octane and it got all goofed up. I had to reset it with the scanner.
     
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  5. iamdub

    iamdub Hold on... Lemme overthink this for a bit...

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    Speaking of refueling events, I heard that the PCM adjusts for a calculated loss of octane rating. It factors the elapsed time since the last refueling event and the calculated octane rating (probably by knock detection/retard tables) of the last drive cycle to estimate the remaining octane rating of the fuel and factors that into it's ignition tables. When you refuel, it starts over.

    A tuner told me this after I mentioned how much better my Tahoe feels so quickly after a fresh tank of 91-93 is poured in. Since mine sits for so long and is refueled once, maybe twice a month, I'm probably only getting the full 91+ octane benefit for the first week or two.
     
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  6. gooffeyguy

    gooffeyguy Full Access Member

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    Removed the "DeSlugger" from the AC plug. Didn't like the way the AC acted when first started, it also made weird clicking noises.

    While under there, I noticed the drivers side sway bar endlink end is broke at the control arm. Typical rust through the bolt.

    I had to replace the ones on my 2011 when I first bought it. It wouldn't pass inspection for me to get my plates. I also had to replace the ball joints also.

    It really sucked, replaced that stuff on the front end so I could get plates, then it was totalled by a drunk driver running a red light 2 months later.

    2001 Yukon SLT
    2012 Yukon Denali XL
    2011 Yukon Denali RIP 5/20/18
     
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  7. Mickey_7106

    Mickey_7106 Full Access Member

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    20 min drive. Nothing major to report


    Screenshot_20190918-163307.jpg
     
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  8. Rocket Man

    Rocket Man Build It Better

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    What’s a deslugger? Or an AC plug for that matter? Am I missing something?
     
  9. petethepug

    petethepug Full Access Member

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    Thanks for posting the deslugger follow up report. Ironically the wifey heard our a/c knock on start up last week. I’m getting into the habit of starting the truck w/ a/c off.



    Sent from my iPhone using Tapatalk
     
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  10. Doubeleive

    Doubeleive Supporting Member

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    I swapped my original cluster back in that I took out 25k miles ago, it shows 10.7mpg same as I am getting now with the new cats so I'm probably right where it's going be I guess, getting the ppv cluster worked on tomorrow i'm going to have like $500 invested in the dam cluster :bawl:
     

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