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

[CHOO CHOO]

Engines are plentiful and therefore relatively cheap. Source you one and reseal it and maybe even AFM delete it while it's out. The LS platform is easy to work on once you know a few key points so it makes a great "learner". Being intimately knowledgeable of the engine will be really handy for any future servicing. Consider yourself fortunate to have a decent head notice instead of suddenly having a blown motor and in a bind to jump on the first replacement you come across.

Did they specify why would it be losing compression? Maybe the valves are just cruddy and not sealing so set of refurb'ed heads would fix it. Like the others said- get a second or third opinion.

He said the seals are going bad most likely.

I think I might have my neighbor check it out. Being that I see him work on people's cars constantly and watching him build a old mustang from the ground up and his old hot rod, I'm sure he would be able to test the compression. And, I know I can pay him and trust him to put in an engine if I decide to get a new engine.

After having some time to think about it, I definitely will keep it and use it as a learning vehicle.

 

[avalonandl]

At 50% compression it has to be a valve seat or rings. Or a valve is not fully closing.

 

[the_tool_man]

He said the seals are going bad most likely.

I think I might have my neighbor check it out. Being that I see him work on people's cars constantly and watching him build a old mustang from the ground up and his old hot rod, I'm sure he would be able to test the compression. And, I know I can pay him and trust him to put in an engine if I decide to get a new engine.

After having some time to think about it, I definitely will keep it and use it as a learning vehicle.

I'm wondering if you've just got a stuck ring? If it's not a DD, you could let the offending cylinder soak with Seafoam or penetrating oil for a few days. Then drive the hound out of it and see what happens.

 

[CrashTestDummy]

He said the seals are going bad most likely.

I think I might have my neighbor check it out. Being that I see him work on people's cars constantly and watching him build a old mustang from the ground up and his old hot rod, I'm sure he would be able to test the compression. And, I know I can pay him and trust him to put in an engine if I decide to get a new engine.

After having some time to think about it, I definitely will keep it and use it as a learning vehicle.

'Seals' are not the problem. I find it odd that ALL the cylinders are at 50%. Definitely get another opinion.

 

[HiHoeSilver]

'Seals' are not the problem. I find it odd that ALL the cylinders are at 50%. Definitely get another opinion.

He said it's only #1.

 

[89Suburban]

@89Suburban, here you go.

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Thank you so much sir.

 

[Idriveaho]

I didn't do it. Beyond my level of polishing... After this it gets ceramic coating.

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mine needs this done badly.

 

[esoteric_ast]

Found out why so many people drive around in Tahoe’s with one DRL out. **** the accountant that designed this headlight setup. Threw my beer in the woods and walked away before I fire bombed my own truck.

 

[Sam Harris]

Found out why so many people drive around in Tahoe’s with one DRL out. **** the accountant that designed this headlight setup. Threw my beer in the woods and walked away before I fire bombed my own truck.

This is why LED’s... Those were the first replacement bulbs I bought for my Yukon. About 5 hours after I bought it. Then swapped all external bulbs to LED’s

 

[PPV12HOE]

This is why LED’s... Those were the first replacement bulbs I bought for my Yukon. About 5 hours after I bought it. Then swapped all external bulbs to LED’s

I did the same... replaced everything with LED's...

 

[R3cord303]

Found out why so many people drive around in Tahoe’s with one DRL out. **** the accountant that designed this headlight setup. Threw my beer in the woods and walked away before I fire bombed my own truck.

LED DRL bulbs was the first thing I did to mine when I got it

 

[Fosscore]

Suburban is giving me a clunking nose under the driver's seat/front wheel area.

The steering wheel is straight and the truck drives straight, so thinking it is suspension related.

Only on the left front wheel. It is noticable going around corners, forward or reverse and can be low speed or say under 35 and hitting a specific bump. Not consistent as described when it happens. Random times it will happen, then not happen. The sound happens, then is gone and may not repeat again for a while or until the next drive.

Thoughts on what I should be looking for/what it might be related to?

I have not had a chance to check it out/jack it up, but am planning to have a look underneath on Saturday morning. Thx.

 

[R3cord303]

Suburban is giving me a clunking nose under the driver's seat/front wheel area.

The steering wheel is straight and the truck drives straight, so thinking it is suspension related.

Only on the left front wheel. It is noticable going around corners, forward or reverse and can be low speed or say under 35 and hitting a specific bump. Not consistent as described when it happens. Random times it will happen, then not happen. The sound happens, then is gone and may not repeat again for a while or until the next drive.

Thoughts on what I should be looking for/what it might be related to?

I have not had a chance to check it out/jack it up, but am planning to have a look underneath on Saturday morning. Thx.

Sway bar end link or CV shaft?

 

[Sam Harris]

Suburban is giving me a clunking nose under the driver's seat/front wheel area.

The steering wheel is straight and the truck drives straight, so thinking it is suspension related.

Only on the left front wheel. It is noticable going around corners, forward or reverse and can be low speed or say under 35 and hitting a specific bump. Not consistent as described when it happens. Random times it will happen, then not happen. The sound happens, then is gone and may not repeat again for a while or until the next drive.

Thoughts on what I should be looking for/what it might be related to?

I have not had a chance to check it out/jack it up, but am planning to have a look underneath on Saturday morning. Thx.

Ask the wifey what she ran over [emoji23]

 

[Fosscore]

Ask the wifey what she ran over [emoji23]

lol. She did tell me it was making a clunking sound so that was a win. Lol

 

[Rocket Man]

He said the seals are going bad most likely.

I think I might have my neighbor check it out. Being that I see him work on people's cars constantly and watching him build a old mustang from the ground up and his old hot rod, I'm sure he would be able to test the compression. And, I know I can pay him and trust him to put in an engine if I decide to get a new engine.

After having some time to think about it, I definitely will keep it and use it as a learning vehicle.

Definitely get a second opinion, compression test with actual numbers. I would be curious as to what they are. How much do you trust the shop you took it to, because at 50% you have pretty serious trouble with that cylinder- rings or valves. And they said all your cylinders are “ losing compression”? How many miles on it?

 

[Doubeleive]

Suburban is giving me a clunking nose under the driver's seat/front wheel area.

The steering wheel is straight and the truck drives straight, so thinking it is suspension related.

Only on the left front wheel. It is noticable going around corners, forward or reverse and can be low speed or say under 35 and hitting a specific bump. Not consistent as described when it happens. Random times it will happen, then not happen. The sound happens, then is gone and may not repeat again for a while or until the next drive.

Thoughts on what I should be looking for/what it might be related to?

I have not had a chance to check it out/jack it up, but am planning to have a look underneath on Saturday morning. Thx.

lube the sway bar bushings

 

[jroyer87]

lube the sway bar bushings

Mine was making a clunking noise also. Turned out to be the lower ball joint.


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[wendal]

Well, I finally got it all back together.... BUT..... It's ticking, which I gather from the forum means it's leaking. I am not surprised. I stripped the first few threads of the driver side forward most hole. And that's not the leak. They simply will not snug up to the block. BUT THEY LOOK GREAT!!! LOL. I'm going to take it to a shop now that I can drive it...
How / who would be able to fix the stripped threads?
Should I take it to an exhaust / muffler shop, or to a engine / repair shop? Would an exhaust shop be able to get them tight, even if they have to remove and reinstall them?

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[trailblazer]

Found out why so many people drive around in Tahoe’s with one DRL out. **** the accountant that designed this headlight setup. Threw my beer in the woods and walked away before I fire bombed my own truck.

Yeah GM didn’t install the 14V bulb. It sucks. Such a PITA to replace the bulbs. Once you do it they’ll last for a very long time.


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