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

[Doubeleive]

I try not to wear boots anymore, so uncomfortable…

I think I have pair sitting in the closet that I haven't even put on it almost 10 years, wearing pants is uncomfortable enough

 

[Sparksalot]

I think I have pair sitting in the closet that I haven't even put on it almost 10 years, wearing pants is uncomfortable enough

TMI!

 

[Rocket Man]

Super helpful Silverado guy…

I got a Yukon too but I still don’t wear boots, much less try to twist them 1/4 turn…

 

[swathdiver]

Wife came home after a long run in the rain and the idler pulley was a little squeaky. Ordered a new idler pulley, tensioner and belt from Rock Auto and replaced it today with the kids in between an oil change and tire rotation. Easy peasy.

The belt was of course worn but still working fine after 178K miles and 13 years. Same for the tensioner. The pulley had some resistance as it was spun round and round.

Put the Tech-2 on the Sierra and she has a faulty passenger side temperature actuator, I could feel it act up while sitting in the truck while running the Tech-2. Interesting to note that the car had not had a DTC in about 36K miles and that was probably when the battery was replaced way back in 2017 with an ACDelco 48PS. The Tech-2 said it's state of charge was 92% and it seems to be in excellent condition for being 5 and a half years old. The 48PS in the Yukon went 48 months. We shall see.

 

[Geotrash]

The belt was of course worn but still working fine after 178K miles and 13 years. Same for the tensioner. The pulley had some resistance as it was spun round and round.

You were still running the original belt at 178K? That seems a bit too thrifty for my taste .

I'm all for saving a buck but I've personally had serpentine belts shred themselves on me in other cars. Once, when I punched the throttle in my old Rodeo to execute a pass. The belt had close to 90K on a 90K change interval so I knew it was time, but it induced a pucker factor in that moment that I'd gladly pay the $50 to avoid in the future . And I was a good 75 miles from the nearest parts store but was carrying a spare, thankfully. These days I change mine every 50K or so.

 

[Doubeleive]

changed both of mine about 4 years ago in 2018 which means they have about 70k on them. i'll have to take a closer look at them this weekend when I do some engine clean up and intake cleaning, need to do all 3 vehicles. I usually take a bottle of purple power and spray the whole engine compartment, then pressure wash it. I like a nice clean engine bay that way any leaks are easily spotted and sourced.

 

[swathdiver]

You were still running the original belt at 178K? That seems a bit too thrifty for my taste .

I'm all for saving a buck but I've personally had serpentine belts shred themselves on me in other cars. Once, when I punched the throttle in my old Rodeo to execute a pass. The belt had close to 90K on a 90K change interval so I knew it was time, but it induced a pucker factor in that moment that I'd gladly pay the $50 to avoid in the future . And I was a good 75 miles from the nearest parts store but was carrying a spare, thankfully. These days I change mine every 50K or so.

Guess I've been lucky, have never had a serpentine belt fail and have been driving cars with them since the 1980s. I'd look at it periodically to see if it had cracks, it still does not. It's all shiny and the grooves are wider of course than the replacement.

Does GM have a published service life on them or to change them out at a certain time?

Back in the day with v-belts, always kept spares in the trunk!

 

[Geotrash]

Guess I've been lucky, have never had a serpentine belt fail and have been driving cars with them since the 1980s. I'd look at it periodically to see if it had cracks, it still does not. It's all shiny and the grooves are wider of course than the replacement.

Does GM have a published service life on them or to change them out at a certain time?

Back in the day with v-belts, always kept spares in the trunk!

I believe it’s 100k

 

[Kapitein]

Front suspension refresh complete.

MevoTech TTX + Arnott electronic shocks. Elected to keep the Z95 suspension.

Also did a 1" level at the same time.

Car rides fantastic and no more steering wobbles on the highway. A big investment bit hopefully worth it.

 

[mattbta]

Guess I've been lucky, have never had a serpentine belt fail and have been driving cars with them since the 1980s. I'd look at it periodically to see if it had cracks, it still does not. It's all shiny and the grooves are wider of course than the replacement.

Does GM have a published service life on them or to change them out at a certain time?

Back in the day with v-belts, always kept spares in the trunk!

I kept tossing belts (teehee) on my LS1 back in the day (ca 2000). I put an ASP underdrive pulley on and apparently cross-threaded the crank bolt and it didn't snug up fully. Doh! I was young...

But yeah, never on a stock motor.

 

[pwtr02ss]

I believe it’s 100k

Thats usually when I do mine.

 

[RooTBeeRthe1st]

Summit usually comes through, FedEx just dropped off my MechMan 250A.

 

[Doubeleive]

took her out for ice cream, somebody wanted to play footsie but couldn't keep up

 

[m1dn]

Did spark plugs and wires today, was surprisingly much easier than i thought!
Took passenger wheel off and all 4 were breeze to remove boot and wire from wheel well.

Idle is much better now, but small needle movement still exists in Drive at stand still.
Needle moves between 500-600rpm and slightly vibrates the car, barely noticeable.

Will try cleaning throttle body again, i think first time i cleaned it, not enough dirt was removed.
Barely sprayed anything and there was no rough start nor white smoke.
Guess i got scared by that youtube video that said be careful or you can hydrolock the engine if you spray too much throttle body cleaner

 

[Doubeleive]

Did spark plugs and wires today, was surprisingly much easier than i thought!
Took passenger wheel off and all 4 were breeze to remove boot and wire from wheel well.

Idle is much better now, but small needle movement still exists in Drive at stand still.
Needle moves between 500-600rpm and slightly vibrates the car, barely noticeable.

Will try cleaning throttle body again, i think first time i cleaned it, not enough dirt was removed.
Barely sprayed anything and there was no rough start nor white smoke.
Guess i got scared by that youtube video that said be careful or you can hydrolock the engine if you spray too much throttle body cleaner

throw in 2 bottles of injector cleaner at each fill up for the next few tank fulls, that will smooth out your idle or should anyway.
they are typically $1.25 a bottle at walmart, I usually buy a 12 pack and put a couple bottles in each vehicle every 2-3 months as regular maintenance.
you can also have a injector service done that usually runs about $80, have it done by a shop that uses the adapter to run it right into the fuel rail.

 

[m1dn]

throw in 2 bottles of injector cleaner at each fill up for the next few tank fulls, that will smooth out your idle or should anyway.
they are typically $1.25 a bottle at walmart, I usually buy a 12 pack and put a couple bottles in each vehicle every 2-3 months as regular maintenance.
you can also have a injector service done that usually runs about $80, have it done by a shop that uses the adapter to run it right into the fuel rail.

Ooh that’s a great idea, thank you!
Will put some in today with fillup, although going to fly on Sunday and car will remain parked at DTW for a week

 

[iamdub]

Ooh that’s a great idea, thank you!
Will put some in today with fillup, although going to fly on Sunday and car will remain parked at DTW for a week

I'm a fan of Berryman B-12. I add a bottle once a month or so when my tank is down to around 1/4 and run it til 1/8 or 1/16 then refuel. Running it when the fuel is low makes more sense to me than adding it to a full tank. It's a better product than Seafoam and half the price- about $4 at Walmart.

Also, don't get too hung up on eliminating the idle vibes in these engines. It seems to be an inherent trait.

 

[Doubeleive]

I'm a fan of Berryman B-12. I add a bottle once a month or so when my tank is down to around 1/4 and run it til 1/8 or 1/16 then refuel. Running it when the fuel is low makes more sense to me than adding it to a full tank. It's a better product than Seafoam and half the price- about $4 at Walmart.

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Also, don't get too hung up on eliminating the idle vibes in these engines. It seems to be an inherent trait.

ya I have added cleaner on full or empty tank, they probably just say "full tank" on the product that so people won't complain if it made the engine run goofy for some god forsaken reason

 

[Rocket Man]

I did a full interior and exterior cleanup on The Machine today and swapped the rubber mats with the logo carpet ones. I’ve never installed them because of the dog hair but now that I have a couple good tools for that I feel it’s time.

 

[gooffeyguy]

Did spark plugs and wires today, was surprisingly much easier than i thought!
Took passenger wheel off and all 4 were breeze to remove boot and wire from wheel well.

Idle is much better now, but small needle movement still exists in Drive at stand still.
Needle moves between 500-600rpm and slightly vibrates the car, barely noticeable.

Will try cleaning throttle body again, i think first time i cleaned it, not enough dirt was removed.
Barely sprayed anything and there was no rough start nor white smoke.
Guess i got scared by that youtube video that said be careful or you can hydrolock the engine if you spray too much throttle body cleaner

If you are flex fuel and have it available nearby, run a tank of E85. That'll clean the injectors, valves, and combustion chambers