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

[mikez71]

ya I was going to ask you if the hp tuners let you set it for like 14.5+ all the time like (min 14.5-15.5 max or no max)
my mechman seems to hang around 14.2 a lot with the ac on since it stays on here 24/7 from april until nov so it's one fix for me lol

Yes you can, I believe 15.5V is 90% and you can set it to 95% max(according to some gm text)
here is a screenshot of the options available to me..

items in green I have deviated from stock. I lowered max voltage, and upped the rest. No idea what the fuel system minimum voltage map is for, didn't touch it.. or half the other settings for that matter!

DC max was 90%, DC min was 36% and the last two diag voltages I upped by 1 volt. (values shown are my modified settings)

 

[mikez71]

crossover steam pipe/seals

Is there a way to get a look at the rear crossover pipe?

I have a bad feeling it's my heater core, somehow a half-dollar size condensation circle appeared inside on windshield while I was messing with the hvac. Didn't see it form.. middle left side. When I opened the door I got a whiff of coolant..

Wonder if I can snake cam from the defroster or floor vent to check heater core..?

 

[jared999]

Much better! Where’s the installed pics? It didn’t happen…

They are in the post...

 

[j91z28d1]

Is there a way to get a look at the rear crossover pipe?

I have a bad feeling it's my heater core, somehow a half-dollar size condensation circle appeared inside on windshield while I was messing with the hvac. Didn't see it form.. middle left side. When I opened the door I got a whiff of coolant..

Wonder if I can snake cam from the defroster or floor vent to check heater core..?

is there a rear crossover? I don't remember seeing one.

 

[Doubeleive]

is there a rear crossover? I don't remember seeing one.

should be capped off in back, they deleted the use of rear pipe at some point with the gmt800's

 

[j91z28d1]

should be capped off in back, they deleted the use of rear pipe at some point with the gmt800's

that sounds right.

 

[Sam Harris]

They are in there...

Better now. Thank you.

Looks great!

 

[alpha_omega]

Added wireless charging to the 2500 today; install was very straightforward and I only made one modification.

In the second picture I cut out a small indent for the wiring to pass forward, otherwise the trim panel which holds the HVAC for the rear will not seat like it did prior. It will seat enough to not really notice but my OCD self can definitely tell that it's not OEM as there is a small break where the rear trim panel connects to the center console as seen in the fourth picture.

This is the kit: https://boostautoparts.com/products/07-14-gm-charging

Your OCD must not be that bad or you would have already taped up or heat shrunk that wire loom. Ha! Nice work though. Cool idea.

 

[alpha_omega]

Dropped the front driveshaft.

Checklist - everything prepped and ready for tomorrow:

drain the transfer case,
drain front diff,
remove old / clean
replace new front output shaft seal,
prep/paint transmission crossmember,
install crossmember,
install new front driveshaft,
R&R rear driveshaft,
Torque spec EVERYTHING!
R&R old/new radiator,
Swap bottom spacers used on trans cooler,


Tomorrow? Nope, that’s (this) morning. Bloody hell! As in less than three hours from now. I’m getting nowhere having this guy help me. Nowhere other than aggravated over broken parts and teaching the same info each day.
I need help from someone who knows the difference between a 1/4”, 3/8” and 1/2” socket. Swivel, extension, drain pan and my Milwaukee 3/8 ratchet…

”um I found a claw hammer, will that work?”

That’s a piston hammer numb-nut$! So not only “No”, but “hell No” that won’t work.
Are my expectations of help (even gofers) just too f*¢kin’ high? Does anyone else feel like we are shooting the wrong caliber and maybe it’s time we should put away the match grade, since everyone else at the range is shooting dummy rounds?

Denali will once again be on hold for…an unknown time frame. I need to mow and weed whip (10 acres), clean the house, open the pool and somehow find time to “baby-proof” the house in prep for a new puppy.

I swear I might go John Wick on a Mf’er tomorrow. Just be cool…

 

[j91z28d1]

brought the tech 2 into work today to try and reset the suspension. only good level ground I got lol. measured rear fender at 37 1/4, front at 34 3/4. that's a lot of rake. checked the air pressure and it was at 22. pretty common i think. raised it a bit to 25psi and then enabled the vent. took like 5 mins to get down to 20 and wouldn't go below it. maybe dropped a 1/4in in the rear. oh well, ran the 2 cals real quick before the compressor clicked on to pump it back up. shall see how it rides at lunch and then remeasure. I sware it looks higher in the back after towing and the cut off on the headlights feels a little lower like I need to adjust them up. been a few months since the tow thou, so think it's settled.

weird.




anyone know what apm set point control is?

found it looking thru the tech 2 but none of my software has anything on it and Google search just brings up manufacturing controls for stuff.

odd.

 

[j91z28d1]

Dropped the front driveshaft.

Checklist - everything prepped and ready for tomorrow:

drain the transfer case,
drain front diff,
remove old / clean
replace new front output shaft seal,
prep/paint transmission crossmember,
install crossmember,
install new front driveshaft,
R&R rear driveshaft,
Torque spec EVERYTHING!
R&R old/new radiator,
Swap bottom spacers used on trans cooler,


Tomorrow? Nope, that’s (this) morning. Bloody hell! As in less than three hours from now. I’m getting nowhere having this guy help me. Nowhere other than aggravated over broken parts and teaching the same info each day.
I need help from someone who knows the difference between a 1/4”, 3/8” and 1/2” socket. Swivel, extension, drain pan and my Milwaukee 3/8 ratchet…

”um I found a claw hammer, will that work?”

That’s a piston hammer numb-nut$! So not only “No”, but “hell No” that won’t work.
Are my expectations of help (even gofers) just too f*¢kin’ high? Does anyone else feel like we are shooting the wrong caliber and maybe it’s time we should put away the match grade, since everyone else at the range is shooting dummy rounds?

Denali will once again be on hold for…an unknown time frame. I need to mow and weed whip (10 acres), clean the house, open the pool and somehow find time to “baby-proof” the house in prep for a new puppy.

I swear I might go John Wick on a Mf’er tomorrow. Just be cool…

if you're asking if you should expect less from helpers. yes, very much yes. did the show up? consider yourself very lucky.

they hired 30 new aircraft mechanics a few weeks ago next door and they couldn't figure out why their golf carts kept dying. they thought they kept getting bad batteries. being all mad and shit, saying China builds the batteries now blah blah blah. I had to explain to them what a GFI outlet is and how to reset it.

they never even thought to wonder why there were no lights in the front of their chargers when they plugged them in.

these are middle-aged men that work on airplanes for a living.

literally no one knows anything these days.

 

[gooffeyguy]

brought the tech 2 into work today to try and reset the suspension. only good level ground I got lol. measured rear fender at 37 1/4, front at 34 3/4. that's a lot of rake. checked the air pressure and it was at 22. pretty common i think. raised it a bit to 25psi and then enabled the vent. took like 5 mins to get down to 20 and wouldn't go below it. maybe dropped a 1/4in in the rear. oh well, ran the 2 cals real quick before the compressor clicked on to pump it back up. shall see how it rides at lunch and then remeasure. I sware it looks higher in the back after towing and the cut off on the headlights feels a little lower like I need to adjust them up. been a few months since the tow thou, so think it's settled.

weird.




anyone know what apm set point control is?

found it looking thru the tech 2 but none of my software has anything on it and Google search just brings up manufacturing controls for stuff.

odd.

What 2 calibrations did you do on the suspension?

 

[j91z28d1]

What 2 calibrations did you do on the suspension?

under the chassis module on the tech 2 there's a ACL trim set cal and a bump stop cal. I don't think anyone really knows what they do or if they are needed. but the service manaual says to park on level ground unloaded and run the calculations if any component has been changed. it seems to be not needed because everyone says everything works and no codes without it. but since I think my ride height changed. I tried running the cal to see if it helped.

 

[Doubeleive]

under the chassis module on the tech 2 there's a ACL trim set cal and a bump stop cal. I don't think anyone really knows what they do or if they are needed. but the service manaual says to park on level ground unloaded and run the calculations if any component has been changed. it seems to be not needed because everyone says everything works and no codes without it. but since I think my ride height changed. I tried running the cal to see if it helped.

wierd even though I have done this in the past and even posted the procedure before I don't recall the bumpstop part which is clearly noted in the procedure
Trimset Recalibration If the system is functioning abnormally, performing the Bumpstop and ALC Trimset recalibration procedures may correct the condition. When a system component has been replaced, the Bumpstop setup and ALC Trimset procedures must be performed.

1. Ensure that the vehicle has a full tank of fuel or add sufficient weight to the rear of the vehicle to simulate a full tank of fuel.
2. Place the vehicle on a flat level surface. Ensure that the suspension is in the normal resting position. With a scan tool, perform the ALC Trimset procedure by following the screen prompts.
3. With a scan tool, perform the suspension Bumpstop setup procedure by following the screen prompts. Once the process has been completed, the system should be fully functional.

 

[j91z28d1]

checked in the same spot after driving. ride hight unchanged, back to 22 psi in the bags and no noticeable difference in ride.

eh.. something to do guess

 

[t_bergman]

Your OCD must not be that bad or you would have already taped up or heat shrunk that wire loom. Ha! Nice work though. Cool idea.

It's been wrapped; thought I had self adhesive wire harness tape in the garage and needed to order it.

 

[gooffeyguy]

under the chassis module on the tech 2 there's a ACL trim set cal and a bump stop cal. I don't think anyone really knows what they do or if they are needed. but the service manaual says to park on level ground unloaded and run the calculations if any component has been changed. it seems to be not needed because everyone says everything works and no codes without it. but since I think my ride height changed. I tried running the cal to see if it helped.

Mine just shows the ALC trim set calibration, which I've done in the past. Once after replacing shocks/struts, and once after installing the front leveling kit.

I don't have a bump stop calibration option, at least not that I remember.

 

[j91z28d1]

Mine just shows the ALC trim set calibration, which I've done in the past. Once after replacing shocks/struts, and once after installing the front leveling kit.

I don't have a bump stop calibration option, at least not that I remember.

if you do it's directly under the alc one.. it might be a z95 mag shock thing? do you have that.

 

[j91z28d1]

wierd even though I have done this in the past and even posted the procedure before I don't recall the bumpstop part which is clearly noted in the procedure
Trimset Recalibration If the system is functioning abnormally, performing the Bumpstop and ALC Trimset recalibration procedures may correct the condition. When a system component has been replaced, the Bumpstop setup and ALC Trimset procedures must be performed.

1. Ensure that the vehicle has a full tank of fuel or add sufficient weight to the rear of the vehicle to simulate a full tank of fuel.
2. Place the vehicle on a flat level surface. Ensure that the suspension is in the normal resting position. With a scan tool, perform the ALC Trimset procedure by following the screen prompts.
3. With a scan tool, perform the suspension Bumpstop setup procedure by following the screen prompts. Once the process has been completed, the system should be fully functional.

I think you have better shop manual than me. I just have prodamand.

is there anything in yours about apm set point?

I'll have to hook the tech 2 back up and see what ir was under. I can't remember. but searched nothing came up.

 

[Doubeleive]

I think you have better shop manual than me. I just have prodamand.

is there anything in yours about apm set point?

I'll have to hook the tech 2 back up and see what ir was under. I can't remember. but searched nothing came up.

apm? air pressure? if so as far as I know the air pressure commands are for testing only