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

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89Suburban

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What did you plug the holes with? Just reinstalled the screws that came out? I can't see in the pics.

No the screws have like a 1/4" shoulder on them so they would not sit flush if I tried that, I just covered the blind nuts with dabs of clear silicone adhesive for now.
 

iamdub

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60psi at both idle and up to 4,000rpms. Going to test knock sensor connectors for voltage irregularities, hope to have the cats flow tested as well of my friends shop is available

I, as well, thought fuel pressure issue at first. Although clogged cat(s) present very similar symptoms as a weak fuel supply, I'm leaning away from clogged cat since you said it "just hit out of no where".

My next guesses are faulty crank sensor or throttle position sensor. Reading a freeze frame for the DTC or even live data would keep you from throwing unnecessary parts at it.
 

Doubeleive

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So this appears to be relatively new, what the hell would cause this? Visually everything looks ok underneath. I'm thinking rear control arms or panhard bar but both look ok. Am I bending corners to hard or WTH?

IMG_20190817_144600.jpg IMG_20190817_144517.jpg
 

iamdub

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No the screws have like a 1/4" shoulder on them so they would not sit flush if I tried that, I just covered the blind nuts with dabs of clear silicone adhesive for now.

I had to ask cuz I wanna remove mine but not until I know how I wanna plug the holes. I was gonna reuse the screws, but now that I know about the shoulders...

My current plan of action is to use socket-head set screws with thread adhesive sealant and some plastic caps painted body color. I'd probably use a mild adhesive to secure the caps. I'd use a butyl-based adhesive cuz silicone can corrode bare metal.

Maybe something like this:

vers-Caps-M5-24-Black-Hex-Socket-Allen.jpg_640x640.jpg
 

swathdiver

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Doubeleive

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You need a stiffer sidewall for those 80mph turns Wes!
You think that's what it is the tires? the wear looks kind of new, rubs on the sides of the control arms also (right where the tire is), but I would think I would be hitting the bump stops before the tire would expand that much, no signs the bump stop have been wearing or even bottoming out. there is 1.5" between the tires and the rub marks
 

iamdub

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So this appears to be relatively new, what the hell would cause this? Visually everything looks ok underneath. I'm thinking rear control arms or panhard bar but both look ok. Am I bending corners to hard or WTH?

View attachment 228913 View attachment 228914


Looks fine to me. Just knocked the dust off is all. If the plastic was getting chewed, then I'd say it's worth digging deeper. Rubbin' is racin'! ...Well, I guess that's not the rubbin' they're referring to. And you're not bending corners too hard. "TOO" hard means you lost control.

Is the plastic in those areas flexible? I mean, I know it's flexible, but does it feel like wind turbulence underneath the car could be bending it outward, closer to the tire and you taking corners at speed rolling the body lower on the outside coupled with the sidewall rolling inward allow the light contact?
 

iamdub

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You think that's what it is the tires? the wear looks kind of new, rubs on the sides of the control arms also (right where the tire is), but I would think I would be hitting the bump stops before the tire would expand that much, no signs the bump stop have been wearing or even bottoming out. there is 1.5" between the tires and the rub marks


Just saw this response. Hitting the control arms is a bit more extreme.

Mount a GoPro where you can watch the sidewall flex and go for one of your spirited drives. Then post a reaction vid of you watching your footage.
 

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Seems to be rubbing more on the right passenger side then the left, there is a hint of rubbing on the upper control arms of both sides

IMG_20190817_163427.jpg IMG_20190817_163339.jpg IMG_20190817_163244.jpg
 

Doubeleive

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when I had my blow out on the right rear side (not that long ago) that would explain away the right side having more rub marks, but the left having some doesn't make any sense
 

Doubeleive

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i'm just wondering because I look under my truck about once a month to check for leaks and broken or missing stuff, I may not have noticed this before but it sure looks fresh
the ass end has been feeling a little different for a little while now I exchanged the air pump a couple months ago because I thought maybe it wasn't blowing up the shocks every time, I went and felt the bladders earlier and they were empty, it had been sitting since last night and they filled up good when I started it up and now that it has sat for about an hour they are empty again seems like they should still have some air in them? not sure seems like they held air longer before after sitting parked
 
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Rocket Man

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I, as well, thought fuel pressure issue at first. Although clogged cat(s) present very similar symptoms as a weak fuel supply, I'm leaning away from clogged cat since you said it "just hit out of no where".

My next guesses are faulty crank sensor or throttle position sensor. Reading a freeze frame for the DTC or even live data would keep you from throwing unnecessary parts at it.
Mine came out of nowhere and then progressively got worse over time.
 

Rocket Man

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Seems to be rubbing more on the right passenger side then the left, there is a hint of rubbing on the upper control arms of both sides

View attachment 228917 View attachment 228918 View attachment 228919
Just looks like you had a bit of weight in it and cornered a bit hard. There is side-to-side movement which can be increased substantially with the above mentioned factors, so slow down on the corners if you’re worried. Or unload the bundles of *******. Or both.
 
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Tonyrodz

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Just looks like you had a big of weight in it and cornered a bit hard. There is side-to-side movement which can be increased substantially with the above mentioned factors, so slow down on the corners if you’re worried. Or unload the bundles of *******. Or both.
Wonder if he stuck that new fridge in it.
 

Doubeleive

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Mine came out of nowhere and then progressively got worse over time.
I jumped up and down on it, rocked it back and forth, wiggled the wheels hard as I could and neither gets it anywhere near rubbing, just strange I could see it happening on the front which is typical if running larger tires but the rear doing it just makes no sense to me
 

Rocket Man

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I jumped up and down on it, rocked it back and forth, wiggled the wheels hard as I could and neither gets it anywhere near rubbing, just strange I could see it happening on the front which is typical if running larger tires but the rear doing it just makes no sense to me
Hey I thought the same thing on my bagged Silverado when I got my new $6000 billet wheels that had a slightly different offset than what I ordered. I pushed and shook and had all kinds of room. Then I went for a drive and promptly scraped both lips on the fenders after going around a couple corners. Believe me, there’s no way you can simulate 4000 lbs ( or whatever our rigs weigh) of force being tossed sideways from g forces.

Edit: if you look at what keeps the suspension centered side to side you’ll see it can move. That’s where (anti) sway bars help but even the biggest can’t stop it completely.
 

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