What did you do to your NBS GMT800 Tahoe/Yukon Today?

[W8TVI]

Finally got the cold start vid.

How about a '98 Sierra with dual exhaust? (My dads truck)

 

[Tonyrodz]

How about a '98 Sierra with dual exhaust? (My dads truck)

Nice deep tone. Is it a flowmaster?

 

[inmypassatlife]

Haven't done an oil change since I bought it @181k. Dealer sticker said bring it in at 185k, I'm at 183.5k and had already put 2.5 qts in it. Not sure when exactly they changed it or what they put in. I just added parts store cheapo to hold me over.

Added half a can of seafoam to the oil and half to the fuel today when I got home. Let it idle for about 20 min with some revs. Then drained and filled with 6qts 5W-30 full synthetic Mobil 1, STP additive with leak guard (figured I'd try it since I'm burning some oil), and a new Delco filter. Feels good to have some piece of mind and now I can really gauge how much it's burning.

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The ATP stop leak has been most effective for me compared to STP and others

 

[jarydM]

Speaker covers, installed single din flip out headunit, added 10" sub and amp, quick hand wash..... View media item 26387View media item 26390View media item 26391View media item 26389View media item 26385View media item 26384

LOVE those custom door inserts! Where did you get them done?

 

[Tonyrodz]

LOVE those custom door inserts! Where did you get them done?

I think those we're stock on the older Denalis.

 

[jarydM]

Haven't done an oil change since I bought it @181k. Dealer sticker said bring it in at 185k, I'm at 183.5k and had already put 2.5 qts in it. Not sure when exactly they changed it or what they put in. I just added parts store cheapo to hold me over.

Added half a can of seafoam to the oil and half to the fuel today when I got home. Let it idle for about 20 min with some revs. Then drained and filled with 6qts 5W-30 full synthetic Mobil 1, STP additive with leak guard (figured I'd try it since I'm burning some oil), and a new Delco filter. Feels good to have some piece of mind and now I can really gauge how much it's burning.

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for what ever reason, and depending on who you talk to, when the switch is made from conventional to synthetic, the engine "uses" 1-2 qts of oil for the first few changes. After that, it normalizes, or whatever, and now my truck doesnt use or leak any oil. I drain 6qts out, and put 6 qts in every time. (then I dump it all over the driveway... ugh)

 

[jarydM]

I think those we're stock on the older Denalis.

Shit!

well, time to find a leather shop that feels adventurous!

 

[HiHoeSilver]

I think those we're stock on the older Denalis.

Back when GM actually spent a little money to make these trucks nice and worth what they cost.

 

[W8TVI]

Nice deep tone. Is it a flowmaster?

My dad is not sure, but the mechanic told him the sound would get better with age.
It is setup as true dual exhaust, and the mufflers look like factory style mufflers.

I plan on eventually getting the same thing on my Yukon XL.

 

[05Single]

Finally got the cold start vid.

Sounds freekin amazing !! So jelly!! Nice work man!!

 

[04Huck]

The ATP stop leak has been most effective for me compared to STP and others

:shake: I'll look into that for next time. I've had decent luck with the STP products in the past though

for what ever reason, and depending on who you talk to, when the switch is made from conventional to synthetic, the engine "uses" 1-2 qts of oil for the first few changes. After that, it normalizes, or whatever, and now my truck doesnt use or leak any oil. I drain 6qts out, and put 6 qts in every time. (then I dump it all over the driveway... ugh)

I've always heard that as well. It seems like all of my LS powered trucks have used 1-2qts over the course of 5-7500 miles the whole time I owned the trucks (2-3 years each). From my research that's about normal.

I was just concerned with this truck because of the occasional black smoke cloud I get at start up after sitting a few hours and being 2qts low after only ~2500 miles from purchase. But like I said, idk when the dealer changed it or what they used. I may switch to 10w-30 next time if it continues the oil usage, just to see how it reacts.

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[jarydM]

good luck @04Huck hopefully its nothing

black smoke IS usually burning oil, but maybe it just needs some TLC

 

[04Huck]

Thanks @jarydM. It does have a bit of a rough idle so I'll be doing a tune up soon as well, hoping I don't have a leaking injector or something. It runs awesome otherwise, just shimmies a tad at idle

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[jarydM]

Thanks @jarydM. It does have a bit of a rough idle so I'll be doing a tune up soon as well, hoping I don't have a leaking injector or something. It runs awesome otherwise, just shimmies a tad at idle

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is it throwing any codes? have you checked?

black smoke could also be a rich condition, which might also be part of the rough idle. Mine was damn near flooding when one of my O2 sensors let go, and then it started burning oil until I replaced it. Lots of things could cause rough idle though, and with age, some of the intake gaskets start to let go too.

too many issues to think about. I would check and see if it has any codes first. Then clean MAF and Throttle Body (there are special cleaners for both of these), change filter (or clean), and replace plugs and wires, if you haven't ever.

run seafoam, or your additive of choice through the fuel system, and if its pre 2003 (I think) replace your fuel filter. If its doesn't have one on the rails near the rear passenger tire, then its part of the pump inside the tank, and don't replace that unless you HAVE to.

 

[Fosscore]

Finally got the cold start vid.

Yessss....love this sound.

 

[Fosscore]

Quick wash this morning before it rained on my drive to work then it stopped and the sun has been shining since I parked it for work. Lol grrr..

 

[05Single]

Quick wash this morning before it rained on my drive to work then it stopped and he sun has been shining since I parked it for work. Lol grrr..

View attachment 81953

Team blue ftw!!!

 

[Rocket Man]

Quick wash this morning before it rained on my drive to work then it stopped and the sun has been shining since I parked it for work. Lol grrr..

View attachment 81953

 

[04Huck]

is it throwing any codes? have you checked?

black smoke could also be a rich condition, which might also be part of the rough idle. Mine was damn near flooding when one of my O2 sensors let go, and then it started burning oil until I replaced it. Lots of things could cause rough idle though, and with age, some of the intake gaskets start to let go too.

too many issues to think about. I would check and see if it has any codes first. Then clean MAF and Throttle Body (there are special cleaners for both of these), change filter (or clean), and replace plugs and wires, if you haven't ever.

run seafoam, or your additive of choice through the fuel system, and if its pre 2003 (I think) replace your fuel filter. If its doesn't have one on the rails near the rear passenger tire, then its part of the pump inside the tank, and don't replace that unless you HAVE to.

I don't have any codes. But I do have some maf cleaner at the house, planning on new air filter/plugs/wife's and a good seafoam of the top end if I can find a good vacuum spot to suck it in. I have hydroboost so it's a bit more difficult

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[jarydM]

I don't have any codes. But I do have some maf cleaner at the house, planning on new air filter/plugs/wife's and a good seafoam of the top end if I can find a good vacuum spot to suck it in. I have hydroboost so it's a bit more difficult

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Good luck on the "new wives" hahaha

Yeah, mine is hydro boost too, I didn't suck the seafoam through the vacuum line, just dumped it in a new tank of gas. Hopefully the stutter at idle is just a tlc thing.