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

[Doubeleive]

Perhaps you have gained weight in your right foot.

maybe, but even when I purposely drive the speed limit it doesn't seem to change, I guess I can try and granny it for a bit and see what happens

 

[Doubeleive]

I know it’s a dumb question but have you checked the dashboard estimated mpg with the manual method of fill tank, drive, refill tank and do the math?

no, but I will next time I fill it up

 

[BG1988]

well from what I have read the cat temps seem to be pretty normal, on the freeway they ran in the 1500's both of them dead even same temp no matter what it was, fuel trims seem to be normal, all 4 02 sensors seem to be normal also, so i'm stumped.

1500F degrees? your running rich
leaking fuel injector..


815C is passed the limit where damage can occur you can bet it will need replacement very soon..


it should be running 525C(Minimum operating temperature and meeting said parameters etc etc.)


other wise it will trigger P0420

650C is typical unless your towing 3.5k rpm and going up hills etc..then it could be higher


Yes both temps should be identical

 

[Doubeleive]

according to the interwebz 1200-1600 is normal under a load and there should not be any melting unless 2000 deg or more is reached.
I am thinking of getting a backpressure test anyway just to be sure, I don't really feel like getting under there myself in 100deg weather, I would imagine the muffler shop could do it on the rack for a reasonable price.

 

[BG1988]

according to the interwebz 1200-1600 is normal under a load and there should not be any melting unless 2000 deg or more is reached.
I am thinking of getting a backpressure test anyway just to be sure, I don't really feel like getting under there myself in 100deg weather, I would imagine the muffler shop could do it on the rack for a reasonable price.

according to the manufacture it's a 3 way catalytic converter..


https://www.open.edu/openlearn/scie...way-catalytic-converter/content-section-1.5.2


i'm going out on a long trip about hour and 1/2 i'll let you know the readings that should be about a baseline

 

[kbuskill]

according to the interwebz 1200-1600 is normal under a load and there should not be any melting unless 2000 deg or more is reached.
I am thinking of getting a backpressure test anyway just to be sure, I don't really feel like getting under there myself in 100deg weather, I would imagine the muffler shop could do it on the rack for a reasonable price.

Mine normally run in the 13-1400° range while cruising around in town.... around 7-800° after idling for a while... if my memory serves me.

I guess it all depends on how hard you drive/accelerate... I'm not to ******* my old gal.

 

[BG1988]

2000F is the melting point

https://www.walkerexhaust.com/support/tech-tips/common-catalytic-converter-q-and-a.html


https://www.magnaflow.com/blogs/magnaflow/magnaflow-on-how-cats-work-part-1


1200°F is the max operating temperature under heavy load

i would trust what a cat manufacture says rather then other random stuff on the internet
they all claim over 1200F could cause premature failure

 

[CHOO CHOO]

Just cut the cats out like I did and you don't have to worry about it anymore [emoji1745]

 

[wendal]

Finally got caught up on this thread, so I can add my latest. Oil change and under hood lighting. Shout out to @kbuskill for the idea. I've had the parts for damned near a year. Pics here:

https://www.tahoeyukonforum.com/thr...-thread-retroactive.99470/page-7#post-1372562

 

[Doubeleive]

Just cut the cats out like I did and you don't have to worry about it anymore [emoji1745]

I wish, o'l Gavin Newsom would have a baby cow if I did though

 

[wjburken]

I wish, o'l Gavin Newsom would have a baby cow if I did though

 

[DaRosa218]

Cut and buffed the paint using Griots products, Silver Birch always looks best glossy

 

[Rocket Man]

Cut and buffed the paint using Griots products, Silver Birch always looks best glossy

I thought most of them look best glossy except the flats...

 

[Kee Fuller]

Replaced the leatherish skin on my center console. Doesnt look bad, but i can tell its a cheap quailty off ebay.

Installed the cabin filter too. That was a pain in the ass. Sprayed the coils with coil cleaner and i dont think i got it all, but its cleaner than before.

 

[Woodblocker55]

New skins 10 ply snow and towing tires yes I will put them on myself that way yellow dot ends up by the stem . They are so stiff of sidewalls it's going take a cheeta blast to get them to seat ya on a 6.5 rim even. There full wrap nylon steel belt radials . Get this with stepped ribs on tread to keep rocks from pinching between face tread. And pinned for studs [emoji849][emoji15] ya total over kill. [emoji106][emoji41] Each tire can handle 3042 lbs . Tire manufacturer told me to just put the air in that's recommended for the vehicle. That's like 34 lbs they can handle 80 psi. Next project is air bags in back coils [emoji106]

Sent from my LGL84VL using Tapatalk

 

[Rocket Man]

New skins 10 ply snow and towing tires yes I will put them on myself that way yellow dot ends up by the stem . They are so stiff of sidewalls it's going take a cheeta blast to get them to seat ya on a 6.5 rim even. There full wrap nylon steel belt radials . Get this with stepped ribs on tread to keep rocks from pinching between face tread. And pinned for studs [emoji849][emoji15] ya total over kill. [emoji106][emoji41] Each tire can handle 3042 lbs . Tire manufacturer told me to just put the air in that's recommended for the vehicle. That's like 34 lbs they can handle 80 psi. Next project is air bags in back coils [emoji106]

Sent from my LGL84VL using Tapatalk

I wanna see those when you get them on!

 

[avalonandl]

Just cut the cats out like I did and you don't have to worry about it anymore [emoji1745]

He can't he is in Commiefornia where the.... nevermind...

 

[Fosscore]

Looking at the overflow tank cold on the NNBS and it hasn’t been driven this morning. Shows below the full line.

Do I need to fill it up to the line or leave it as is for expansion?

 

[Doubeleive]

Looking at the overflow tank cold on the NNBS and it hasn’t been driven this morning. Shows below the full line.

Do I need to fill it up to the line or leave it as is for expansion?

View attachment 230169

You can try to make it stay on the full cold line, mine won't unless I have it done on the machine at the dealer, but I'm going to try again as well

 

[Fosscore]

You can try to make it stay on the full cold line, mine won't unless I have it done on the machine at the dealer, but I'm to try again as well

View attachment 230171

So either way, we are close to where we need to be at cold temp then? It looks low, but not actually too low to be too concerned about is what you are saying?