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

[Doubeleive]

Agreed. Should be calibrated for whatever weight is normally in the vehicle.

Related: does your guys’ air suspension compressor kick on every time you start the vehicle? I literally never hear mine. And I’ve got realitivly new rear air shocks.

Mine does yes, found conflicting information on the matter in gm's documents, one document says it should everytime and another say's it is normal for it to not turn on everytime

*that is part of the reason why I ever even messed with mine, the compressor wasn't coming on everytime and the shocks had a slow leak, so I just replaced both

I would say if your pump does not turn on everytime then there might be something wrong, if you have a tech2 and run the alc trimset you should hear the pump release the air, if it doesn't then the release valve may be bad and it's just holding air and therefore never needs to come on. just my guess... I think you can test the valve with the tech2 also in the same menu

 

[mikeyss]

Mine comes on every time I turn the ignition to on. It runs for 5 seconds or so, then stops. I can only hear it if I have my window open or if standing outside. It also exhausts for a second when I shut it off, again can only hear it outside and it's a quick hiss. My pump, rear shocks and front struts are all about 8k miles old.

I never did a recalibration after the replacements, and now I run without the 3rd row and spare tire. I wonder if a recalibration would do anything for it.

 

[wjburken]

Mine comes on every time I turn the ignition to on. It runs for 5 seconds or so, then stops. I can only hear it if I have my window open or if standing outside. It also exhausts for a second when I shut it off, again can only hear it outside and it's a quick hiss. My pump, rear shocks and front struts are all about 8k miles old.

I never did a recalibration after the replacements, and now I run without the 3rd row and spare tire. I wonder if a recalibration would do anything for it.

Same here. Never did an intentional recalibration any of the times I have replaced compressors either. And mine seem to run every start cycle also.

 

[gooffeyguy]

I did the recalibration with it in the garage (flat concrete) and stood along side it with the Tech2 cord out the drivers side window. I left the 3rd row in, as it usually is.

My pump does come on for about 5 seconds everytime I turn the key

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

 

[Rocket Man]

I’m running lowered 2/4 so my results might not be normal but when I did the ALC trim set it messed mine up and set it too low so for the first few days it felt like it was bottoming out but it gradually set itself right and now it’s back to where it should be. I should have just left it alone, it was fine but I just had to play with my Tech 2. My compressor comes on if it’s been sitting for a long time as in overnight but not if it’s only been a few hours. I’m also talking NBS.

 

[wjburken]

My pump does come on for about 5 seconds everytime I turn the key

I can see it now. Tomorrow there will be 500 guys leaning over next to their vehicles listening for a compressor to kick-on!

 

[Rocket Man]

I can see it now. Tomorrow there will be 5 guys leaning over next to their vehicles listening for a compressor to kick-on!

Fixed it.

 

[wjburken]

Oh, c’mon. Can’t we dream a little?

 

[R3cord303]

Guess I’ll add a Tech-2 to my list of crap to buy. :/ I also have ditched a bunch of weight out of the vehicle. Full spare tire delete, 3rd row is up in the attic somewhere, threw away the hood insulation. Maybe that has something to do with the compressor not doing anything. Though when I was helping my Grandpa move we had prob 1200 pounds of his crap thrown in the back. The seats were all folded down and it was up to the roof and all the way back to the hatch. The rear end was squatting about 4” and I never heard the compressor then either. I figured it was because it was just so full of stuff it couldnt even autolevel but now I’m thinking maybe the compressor is just locked up.

 

[Rocket Man]

Guess I’ll add a Tech-2 to my list of crap to buy. :/ I also have ditched a bunch of weight out of the vehicle. Full spare tire delete, 3rd row is up in the attic somewhere, threw away the hood insulation. Maybe that has something to do with the compressor not doing anything. Though when I was helping my Grandpa move we had prob 1200 pounds of his crap thrown in the back. The seats were all folded down and it was up to the roof and all the way back to the hatch. The rear end was squatting about 4” and I never heard the compressor then either. I figured it was because it was just so full of stuff it couldnt even autolevel but now I’m thinking maybe the compressor is just locked up.

They will auto level no matter how much weight. I had a trailer with a lot of tongue weight and 7 people in mine and was running 26” wheels lowered and it leveled. Not a single scrape.