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

[iamdub]

2.281" for the rear, and 2.575" for the front.

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More Information for DORMAN 610434

www.rockauto.com

I learnt something new!

 

[swathdiver]

2.281" for the rear, and 2.575" for the front.

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Here is what ACDelco says for ours.

 

[89Suburban]

If your vehicle is Flexfuel, run a tank of E85. That stuff is great at cleaning out the combustion chambers

That's the one thing I haven't done to this rig yet. I run 89 because I get a pre det knock on the 87. And towing the boat too. Should I still try the E85 due to this?

 

[CaptainAmerica1]

That's the one thing I haven't done to this rig yet. I run 89 because I get a pre det knock on the 87. And towing the boat too. Should I still try the E85 due to this?

Absolutely.

 

[Doubeleive]

Got some kind of squeak noise on the right rear, only when turning left and occasionally when straight for a second after coming out of a left turn, can't find anything visible, brake cleaned the inside and outside of rotor, slapping it back on. Any ideas? I'm at 144k I doubt it's a axle bearing at this mileage everything looks good

 

[RooTBeeRthe1st]

I guess the bright side is that, since it sounds like it needs new rings and a hone (as you've already determined), you could gap the rings for boost.

If your vehicle is Flexfuel, run a tank of E85. That stuff is great at cleaning out the combustion chambers

That's pretty much all I ever run in mine, so I expect when I take it all apart that it should look pretty decent.

 

[Doubeleive]

Got some kind of squeak noise on the right rear, only when turning left and occasionally when straight for a second after coming out of a left turn, can't find anything visible, brake cleaned the inside and outside of rotor, slapping it back on. Any ideas? I'm at 144k I doubt it's a axle bearing at this mileage everything looks goodView attachment 367503

Well after driving in circles and rotating front & rear windows up & down and then having the wife ride shotgun with her head out the window it is the front right, not rear, pretty typical for these trucks to throw sound, took the front right wheel off and inspected, did a minor tweak to one of the brake pad metal tabs and 90% of the noise is gone, hubs seem ok no play but I can hear a couple light "ticks" when spinning the wheels which is probably normal but I think I will order new hubs and pads anyway.

and got to use the new Ridgid took 3 of the wheels off and back on, didn't even put a dent in the big battery and with it set on "2" it was pretty dam close to 140ft lbs with a few bumps.

 

[Tonyrodz]

Well after driving in circles and rotating front & rear windows up & down and then having the wife ride shotgun with her head out the window it is the front right, not rear, pretty typical for these trucks to throw sound, took the front right wheel off and inspected, did a minor tweak to one of the brake pad metal tabs and 90% of the noise is gone, hubs seem ok no play but I can hear a couple light "ticks" when spinning the wheels which is probably normal but I think I will order new hubs and pads anyway.

and got to use the new Ridgid took 3 of the wheels off and back on, didn't even put a dent in the big battery and with it set on "2" it was pretty dam close to 140ft lbs with a few bumps.

Could those ticks you hear be the cv axle?

 

[Doubeleive]

Could those ticks you hear be the cv axle?

Not likely, usually the ticks are bearing noise, 2wd's will make the same noise, one axle is fairly new and both sides sound about the same. at the mileage I am at I am getting close to having to do the hubs anyway I found oem hubs from o-reilly for $175 (special order) I will go by there later today and see if they can get them at that price otherwise rockauto has them for 189, if I can get them from o-reilly then I will save the shipping cost and a few bucks, hubs are easy to do anyway, no rust here and I am pretty sure I have the socket for the axle in my tool box already

 

[pwtr02ss]

I'm not sure. I wanna say probably not since GM outlines a soak in their oil consumption TSB. But, GM is also the aśśhole that says burning one quart of oil every 2,000 miles is within spec.

I doubt it'll hurt anything. There's no way the combustion chambers and/or rings hold enough carbon to do any real damage to the cats. I don't know how much it smokes. If you're thinking of Seafoam, the good/right stuff to perform the soak contains a lot more active ingredients that burn off in the dissolved carbon. The majority of Seafoam is pale oil, so that's mostly what's smoking when burning. It's not "all the carbon" in your engine. A brand new, carbonless engine will smoke like crazy when Seafoamed.

Freeing up the oil control ring and swapping my valve cover basically stopped my oil consumption. It was consuming a quart about 2500 miles too. It had also started smoking at start up after long drives on the interstate. I just sucked some water through the intake while revving it slightly. I took a water bottle and poked a small hole in the lid so it would spray a fine mist/stream in the intake while I had someone rev it. I did that around 150k miles.

 

[gooffeyguy]

That's the one thing I haven't done to this rig yet. I run 89 because I get a pre det knock on the 87. And towing the boat too. Should I still try the E85 due to this?

If your rig is Flexfuel capable, won't hurt to try. E85 is like 105-110 octane.

I've heard mine ping a bit on 93 octane when punching it when getting on the highway (have a Diablo tune on it) but it doesn't do it when running E85

 

[89Suburban]

If your rig is Flexfuel capable, won't hurt to try. E85 is like 105-110 octane.

I've heard mine ping a bit on 93 octane when punching it when getting on the highway (have a Diablo tune on it) but it doesn't do it when running E85

No trying to find somebody local that actually has it...

 

[RooTBeeRthe1st]

Will shoot, stuck oil rings and valve cover changes, now I have reading to do on my way to the river tonight

 

[RooTBeeRthe1st]

Freeing up the oil control ring and swapping my valve cover basically stopped my oil consumption. It was consuming a quart about 2500 miles too. It had also started smoking at start up after long drives on the interstate. I just sucked some water through the intake while revving it slightly. I took a water bottle and poked a small hole in the lid so it would spray a fine mist/stream in the intake while I had someone rev it. I did that around 150k miles.

What's the reason for a valve cover change?

 

[justchecking]

If your rig is Flexfuel capable, won't hurt to try. E85 is like 105-110 octane.

I've heard mine ping a bit on 93 octane when punching it when getting on the highway (have a Diablo tune on it) but it doesn't do it when running E85

Which Diablo tune do you have on it? I have Diablo Tow tune and am running 93 Octane. My first camper tow with tune and 93 octane will be next week in prep for Ohio turkey season.

 

[Doubeleive]

Best price I could find for oem, at least they have lifetime warranty

 

[pwtr02ss]

What's the reason for a valve cover change?

I can't remember what year yours is but mines an 08. Somewhere around 10-11, they changed the design of the valve cover to reposition the pcv system. This helps with oil consumption. The reason for the upper engine soak/clean is to free the rings up from all the previously consumed oil. I'd bet if you did those things, you'd fix your problem

 

[gooffeyguy]

Which Diablo tune do you have on it? I have Diablo Tow tune and am running 93 Octane. My first camper tow with tune and 93 octane will be next week in prep for Ohio turkey season.

The Performance tune, 93 octane.

I only run 93 or E85

I think I might have an economy tune, that's supposed to sacrifice some performance for better mileage. With these higher gas prices I might install it and try it for a couple weeks and see how it does.

 

[RooTBeeRthe1st]

I can't remember what year yours is but mines an 08. Somewhere around 10-11, they changed the design of the valve cover to reposition the pcv system. This helps with oil consumption. The reason for the upper engine soak/clean is to free the rings up from all the previously consumed oil. I'd bet if you did those things, you'd fix your problem

I have a 14 so I suppose my valve covers are good.
My catch can doesn't collect very much...hope I have sticky rings.

 

[iamdub]

Freeing up the oil control ring and swapping my valve cover basically stopped my oil consumption. It was consuming a quart about 2500 miles too. It had also started smoking at start up after long drives on the interstate. I just sucked some water through the intake while revving it slightly. I took a water bottle and poked a small hole in the lid so it would spray a fine mist/stream in the intake while I had someone rev it. I did that around 150k miles.

I never knew this was one of the Avy's adventures. Cool stuff!