2011 Yukon Denali engine cylinder bad

[LovedmyDenali]

Help please...

Took to mechanic:
Stabilize track light on needs service.
Then went to engine light on.
Steering wheel slightly shaking.

Mechanic said,
Diag. found # 3 cylinder misfire low compression on #3 R and R left hand valve cover to inspect valve train ok.
Perform leak down test #3 intake valve burned to many miles to disassemble and repair needs engine.

I need a trade in what do you think I can get if I sell for parts:
Great air, transmission, tows, wonderful stereo, working auto step and good tires. no damage inside or out. Front left light is foggy.

some city but mostly country driving in Calvert county maryland

 

[Geotrash]

What's it worth and advice on what sites to profile it greatly appreciated.
I loved my Denali 2011 Yukon and its been taken care of at 175 miles engine cylinder #3 not working well and mechanic says needs new engine. . I dont want the expense of new engine. Inside and out of SUV is great, including sound system, tires, air conditioner, seats and floor that said, I need a down payment for anther SUV.

Sorry about the bad luck. We see this sometimes with 6.2s run on 87 octane fuel though of course I have no idea if that's the case here. #3 is not an AFM cylinder so it's unlikely to be related to the AFM system. Do you have any more details from the mechanic as to what went wrong with that cylinder, specifically?

In terms of value, with the mileage and a bad engine it's not going to be worth much more than maybe $3500. What kind of shape is the body in? Is this a dry climate car or has it spent its life in the salty north/northeast? Do you have any pictures to help us evaluate it?

There is a for sale section here but I believe it requires people to have a certain number of posts before it will allow you to post a for sale ad. So, Facebook Marketplace, Craigslist and Auto Trader are probably your best bets.

 

[vinbart]

You need to get your mechanic to be more specific than "cyl not working well, needs new engine". And don't be afraid to get a second opinion.

 

[swathdiver]

I hate superfluff language! What's wrong with my car? It needs a new engine! ARGGHH!!!!

I doubt you need a new engine but I'm certain you need a new mechanic!

So many today lack the skills or want to make an internal engine repair, they just want to swap parts and the engine is a big part to them. If something goes wrong, why it's not their fault, contact the people who made it. You're fired!

You might have a collapsed lifter or more likely a broken valve spring. If the motor got hot, those all aluminum 6.2s are quick to drop a valve seal and get a valve stuck in the head. All of these things can be fixed easily by even a halfway competent mechanic.

 

[Ibustbravo]

What's it worth and advice on what sites to profile it greatly appreciated.
I loved my Denali 2011 Yukon and its been taken care of at 175 miles engine cylinder #3 not working well and mechanic says needs new engine. . I dont want the expense of new engine. Inside and out of SUV is great, including sound system, tires, air conditioner, seats and floor that said, I need a down payment for anther SUV.

You're in good company I'm in the same boat. I replaced the engine last week and this week the trans is being rebuilt. I have a 15 Yukon and have only had it 5yrs. Do you remember that Jonnie Taylor song? 'It's cheaper to keep her' ?

Get a whiskey and listen to this song.. Cheers..

 

[avalonandl]

Have a mechainc use a borscope on that cylinder.

But pull the plugs on that side.

 

[petethepug]

L94 to L96 swap is your friend. The 6.0L from the 3/4 & 1T trucks does not have AFM but retains the e85 compatibility. It’s a straight swap and you’ll get to run it on Reg gas with 30-40 less hp than the 6.2L. If you cam it before install you’ll be back at 400hp and crazy down low torque.

They are plentiful and inexpensive brutes.

L94 to L96 engine swap

Looking for advice, the engine in my 2012 Denali has had a few problems over the years and has recently developed a tap in the bottom. We suspect a cracked piston or wrist pin issue. I’ve also had AFM related issues a few times. I’m thinking about replacing it wit an L96 truck engine. I realize...

www.tahoeyukonforum.com

 

[LovedmyDenali]

Sorry about the bad luck. We see this sometimes with 6.2s run on 87 octane fuel though of course I have no idea if that's the case here. #3 is not an AFM cylinder so it's unlikely to be related to the AFM system. Do you have any more details from the mechanic as to what went wrong with that cylinder, specifically?

In terms of value, with the mileage and a bad engine it's not going to be worth much more than maybe $3500. What kind of shape is the body in? Is this a dry climate car or has it spent its life in the salty north/northeast? Do you have any pictures to help us evaluate it?

There is a for sale section here but I believe it requires people to have a certain number of posts before it will allow you to post a for sale ad. So, Facebook Marketplace, Craigslist and Auto Trader are probably your best bets.

Hi Dave,

This is Tina aka Loved my Denail. I updated my info thanks for answering some questions for me. Ugh

 

[LovedmyDenali]

I hate superfluff language! What's wrong with my car? It needs a new engine! ARGGHH!!!!

I doubt you need a new engine but I'm certain you need a new mechanic!

So many today lack the skills or want to make an internal engine repair, they just want to swap parts and the engine is a big part to them. If something goes wrong, why it's not their fault, contact the people who made it. You're fired!

You might have a collapsed lifter or more likely a broken valve spring. If the motor got hot, those all aluminum 6.2s are quick to drop a valve seal and get a valve stuck in the head. All of these things can be fixed easily by even a halfway competent mechanic.

Thanks Swathdiver I updated my info from the mechanics invoice. New at this.

 

[Doubeleive]

it sou

Help please...

Took to mechanic:
Stabilize track light on needs service.
Then went to engine light on.
Steering wheel slightly shaking.

Mechanic said,
Diag. found # 3 cylinder misfire low compression on #3 R and R left hand valve cover to inspect valve train ok.
Perform leak down test #3 intake valve burned to many miles to disassemble and repair needs engine.

I need a trade in what do you think I can get if I sell for parts:
Great air, transmission, tows, wonderful stereo, working auto step and good tires. no damage inside or out. Front left light is foggy.

some city but mostly country driving in Calvert county maryland

sounds like it can be fixed the mechanic doesn't want to do it. chemicals, walnut shell, etc
might cost as much as that down payment though

 

[swathdiver]

Ok, so you have a bad cylinder head. Couple hundred bucks in parts and you're back on the road. Generally speaking, it costs less to fix it.

 

[Geotrash]

Hi Dave,

This is Tina aka Loved my Denail. I updated my info thanks for answering some questions for me. Ugh

Thanks Tina, that’s super helpful information. The way I read those comments from the mechanic is that he thinks it’s a burned valve in that cylinder causing the problem but doesn’t know for sure. But that’s not a common problem on these engines. It’s much more common to have problems with a broken valve, spring, or a bad lifter, causing the misfire. But he seems to rule both of those things out by saying that the valve train is OK. My instinct is to give him the benefit of the doubt and presume that he fears it could be worse, but doesn’t know for sure, and that if he has to pull the engine, it is going to be a lot more money.

There is a tool called a borescope, mentioned by another member, which is a little camera that the mechanic can use to look inside that cylinder and see if there’s any damage. I think it’s worth the additional diagnostic fee to have that done. If that same shop doesn’t do it, I would take it somewhere else that does. Call around to a good, well-reviewed shop on Google Maps.

What the inspection will tell you is whether or not you have damage to the piston, or damage to a valve, or both. If it’s just damage to a valve, and no damage to the piston, all that will require is some cylinder head work, which is a whole lot less expensive than a new engine.

If there’s damage to the piston, then the engine will have to come out, that piston replaced, and possibly the cylinder honed. Putting a new engine in is kind of the nuclear option in my opinion. But, a Jasper reman will probably be close to $9000 or $10000 installed, but will last you a very long time in that vehicle. Of that cost, the cost of the engine will probably be about $6500, and the rest removal and installation. So once you’ve paid the removal and installation, then the additional $6500 gets you a whole new engine. It’s up to you whether that would be worth it.

 

[swathdiver]

It’s much more common to have problems with a broken valve, spring, or a bad lifter, causing the misfire.

If there’s damage to the piston, then the engine will have to come out, that piston replaced, and possibly the cylinder honed.

We have seen that when 6.2 get hot, they tend to drop a valve seat which often results in a stuck valve.

Pistons and rods can be replaced without removing the engine.

 

[Geotrash]

Y

We have seen that when 6.2 get hot, they tend to drop a valve seat which often results in a stuck valve.

Pistons and rods can be replaced without removing the engine.

Yes, they sure can be, but there's a high probability of cylinder wall damage requiring machine shop work, and most shops won’t do it that way and would pull the engine, so that’s why I explained it that way. But yes, you are 100% correct.