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

[donjetman]

Changed spark plugs today.

Today I installed a set of ACDelco # 41-962 plugs. I removed ole obsolete ACDelco 41-985 plugs that I had cleaned up(see first 3 pics below) and re-installed back in Dec of 2018 when I had first purchased the vehicle with 131k miles. Back then it was burning and leaking oil like crazy. Folks here told me to install a catch can. This showed me it was catching an oz of oil every 100 miles. This amount of oil being sucked into the combustion chambers had "stuck" the piston rings. It also needed a rear main seal. I did a little research and discovered TSB# 10-06-01-008M: TSB# 10-06-01-008M So I did the valve cover update, installed the bypass deflector, and did an extra long piston/combustion chamber soak with Gunk brand "Motor Medic". I also replaced the rear main seal. Here are pics from Dec 2018 "before" cleaning:



Today vehicle has 171k miles, it doesn't need any makeup oil between extended changes, the catch can doesn't catch much of anything, and it's dry as a bone underneath.

Below is a pic I took "today" of the ole plugs that I pulled out. They have 40k more miles since I cleaned them(see pics in post# 1) and no sign of burning oil. YEAH!

 

[George B]

Thats impressive. Thanks for sharing.

 

[pwtr02ss]

Changed spark plugs today.

Today I installed a set of ACDelco # 41-962 plugs. I removed ole obsolete ACDelco 41-985 plugs that I had cleaned up(see pics in post# 1 here) and re-installed back in Dec of 2018 when I had first purchased the vehicle with 131k miles. Back then it was burning and leaking oil like crazy. Folks here told me to install a catch can. This showed me it was catching an oz of oil every 100 miles. This amount of oil being sucked into the combustion chambers had "stuck" the piston rings. It also needed a rear main seal. I did a little research and discovered TSB# 10-06-01-008M: TSB# 10-06-01-008M So I did the valve cover update, installed the bypass deflector, and did an extra long piston/combustion chamber soak with Gunk brand "Motor Medic". I also replaced the rear main seal. Here are pics from Dec 2018 "before": View attachment 349458
View attachment 349459
View attachment 349460

Today vehicle has 171k miles, it doesn't need any makeup oil between extended changes, the catch can doesn't catch much of anything, and it's dry as a bone underneath.

Below is a pic I took "today" of the ole plugs that I pulled out. They have 40k more miles since I cleaned them(see pics in post# 1) and no sign of burning oil. YEAH! View attachment 349457

Awesome!

 

[Rocket Man]

Changed spark plugs today.

Today I installed a set of ACDelco # 41-962 plugs. I removed ole obsolete ACDelco 41-985 plugs that I had cleaned up(see first 3 pics below) and re-installed back in Dec of 2018 when I had first purchased the vehicle with 131k miles. Back then it was burning and leaking oil like crazy. Folks here told me to install a catch can. This showed me it was catching an oz of oil every 100 miles. This amount of oil being sucked into the combustion chambers had "stuck" the piston rings. It also needed a rear main seal. I did a little research and discovered TSB# 10-06-01-008M: TSB# 10-06-01-008M So I did the valve cover update, installed the bypass deflector, and did an extra long piston/combustion chamber soak with Gunk brand "Motor Medic". I also replaced the rear main seal. Here are pics from Dec 2018 "before" cleaning: View attachment 349458
View attachment 349459
View attachment 349460

Today vehicle has 171k miles, it doesn't need any makeup oil between extended changes, the catch can doesn't catch much of anything, and it's dry as a bone underneath.

Below is a pic I took "today" of the ole plugs that I pulled out. They have 40k more miles since I cleaned them(see pics in post# 1) and no sign of burning oil. YEAH! View attachment 349457

Sweet! Kinda hard to believe it was even running with those original plugs.

 

[89Suburban]

Changed spark plugs today.

Today I installed a set of ACDelco # 41-962 plugs. I removed ole obsolete ACDelco 41-985 plugs that I had cleaned up(see first 3 pics below) and re-installed back in Dec of 2018 when I had first purchased the vehicle with 131k miles. Back then it was burning and leaking oil like crazy. Folks here told me to install a catch can. This showed me it was catching an oz of oil every 100 miles. This amount of oil being sucked into the combustion chambers had "stuck" the piston rings. It also needed a rear main seal. I did a little research and discovered TSB# 10-06-01-008M: TSB# 10-06-01-008M So I did the valve cover update, installed the bypass deflector, and did an extra long piston/combustion chamber soak with Gunk brand "Motor Medic". I also replaced the rear main seal. Here are pics from Dec 2018 "before" cleaning: View attachment 349458
View attachment 349459
View attachment 349460

Today vehicle has 171k miles, it doesn't need any makeup oil between extended changes, the catch can doesn't catch much of anything, and it's dry as a bone underneath.

Below is a pic I took "today" of the ole plugs that I pulled out. They have 40k more miles since I cleaned them(see pics in post# 1) and no sign of burning oil. YEAH! View attachment 349457

That's what my #6 looks like after 2 years. I am running a step up hotter plug range to see if it helps.

 

[donjetman]

Sweet! Kinda hard to believe it was even running with those original plugs.

Right? It was running fine, no check engine light, DIC message, codes, nothing? Unbelieveable

 

[RooTBeeRthe1st]

Rolled her over yesterday morning.

 

[pwtr02ss]

That's what my #6 looks like after 2 years. I am running a step up hotter plug range to see if it helps.

I took a water bottle and poked a tiny hole in the lid. Slowly squirted water in the throttle body while maintaining 2500 rpm. It steams the cylinders. May not be recommended these days, but an old school remedy for build up. That got my stuck ring loose. Beware, if you're in the grass, it'll kill it around the tailpipe.

 

[gooffeyguy]

Right? It was running fine, no check engine light, DIC message, codes, nothing? Unbelieveable

Did you ever run E85 with those funky plugs?

 

[avalonandl]

Did you ever run E85 with those funky plugs?

I had my plugs changed at 134k miles and they were clearly the OE plugs . I had just purchased the Denali and ulled the #1 plug.

They looked NOTHING like those but my idle smoothed right out.