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07YukonDenali

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07YukonDenali Enthusiast

07YukonDenali

Posted
Posted

I have an '07 Denali that is burning oil, and has piston slap that seems to be getting worse. I was waiting for Ford to release a new Navigator, but it looks like that will not be happening for a while. I don't want a Mercedes, or a BMW due to the fact they require high maintenance, and they become a nightmare after 100K.

 

Decided I want to trade in my truck for an '06 Denali XL. I have done my research, and it seems like the GMT-800 platform is far more reliable than the 900.

 

My question is this:

 

Should I mention the oil burning/piston slap to the salesmen when I trade my truck in? How much would it hurt my truck's value?

 

Edit: Does anybody know when they started using the crappy AFM in the 6.2L engines?

RyanbabZ71 Senior Enthusiast

RyanbabZ71

Posted
Posted
it seems like the GMT-800 platform is far more reliable than the 900

 

Instead of the "show me the carfax" show me the data. I dont buy it. Look at all the steering shaft complaints on the GMT-800's. Engine knocking was another big issue. I had more recalls on my 2000 (2 or 3 not major but still) than on my 08 Tahoe and 10 Silverado combined (ZERO)

 

The AFM 6.2 is only used in the SUV's, the pickup 6.2 does not have AFM.

 

Also you can tune your vehicle and have AFM removed.

jblakeney Senior Enthusiast

jblakeney

Posted
Posted

I didn't get a recall on my 1999 GMT800 till like 05 or 06..... And then it was just the tailgate straps... Then the brake pipe (tubing).... They replaced the straps and checked the brake pipe tubing.....

 

190k on the odometer, Engine is a tight as ever. Holds 60psi off idle and 40ish on idle..... Doesn't smoke and usually on 3-4k on an oil change its still at the top of the cross hatches on the stick.

 

I put one water pump on it and it was not bad... Just didn't want to just change a gasket (which was leaking).

 

Thought the transmission was going out, only to find a shift solenoid puked..... I'm going to sympathy build it in a few weeks, since before the solenoid puked I had already got a deluxe kit, converter, reaction shell, solenoid kit, wiring harness, planets, and sprags....... Ended up taking a 800 mile trip in it after I put the solenoid in......

 

If I had a chance to buy another new 1999 GMC Sierra like mine, I would to it in a heart beat, with out flinching.

 

Jbo

 

edit: and the steering shaft..... I think I paid 58 bucks might have even been 48...... 15 minutes it was in toooo...

pistonslap Enthusiast

pistonslap

Posted
Posted

If you buy a GMT-800 make sure the motor is cold when you start it up. And if the outside temperature is cool,better yet. When I bought my 2000 it sounded quiet with no piston slap,rod knock etc... After I bought the truck home and started it cold, the motor noises scared the H out of me. It has excellent oil pressure. And when I change the oil I have never seen any metal debris on the magnetic pan plug. Yet I'd swear that there is a rod bearing going. The only time it is quiet now is when the motor is fully warmed up,and that takes a while. I now know why it was parked outside the salesman's door when they were expecting me. Lol They must of been starting it on and off to keep the motor warm.

Baja 252 Enthusiast

Baja 252

Posted
Posted
Should I mention the oil burning/piston slap to the salesmen when I trade my truck in?

 

After several years and several dealers telling me that the piston slap in my trucks was "normal", I certainly felt no obligation to inform them of this "normal" condition at trade-in-time.

Stevens03 Senior Enthusiast

Stevens03

Posted
Posted
Decided I want to trade in my truck for an '06 Denali XL. I have done my research, and it seems like the GMT-800 platform is far more reliable than the 900.

 

My question is this:

 

Should I mention the oil burning/piston slap to the salesmen when I trade my truck in? How much would it hurt my truck's value?

 

Edit: Does anybody know when they started using the crappy AFM in the 6.2L engines?

 

I don't believe that for a second. I've owned both and by far (IMO) the 900's the better truck all around. With that said, GM doesn't feel that piston slap is an issue, so other than sounding like a diesel, it's a non issue. Using oil, thats another issue. Again, GM doesn't see using a quart in 3000 miles is an issue either but I personally disagree. Piston slap was/is in the 800 platforms too. Mostly the 5.3 and 6.0's. I see no need to mention either issue when trading since GM doesn't see either an issue.

 

As stated above, the with the 6.2L, AFM was in the SUV's and not the trucks.

Rayaz_XL Enthusiast

Rayaz_XL

Posted
Posted
The AFM 6.2 is only used in the SUV's, the pickup 6.2 does not have AFM.

 

Also you can tune your vehicle and have AFM removed.

 

 

Hey guys, sorry for my lack of knowledge but what does AFM stand for, what does it do, what is it meeded for. Also what benefits are there of having AFM removed???

 

 

My 07 Yukon Denali XL also has piston slap more in the cold weather. I am not impressed with that, quality of the 20" chrome wheels, fake wood trim. Other than that it is a solid, comfortable, beautiful looking SUV that turns heads.

Daryl LBZ Senior Enthusiast

Daryl LBZ

Posted
Posted
Should I mention the oil burning/piston slap to the salesmen when I trade my truck in?

 

After several years and several dealers telling me that the piston slap in my trucks was "normal", I certainly felt no obligation to inform them of this "normal" condition at trade-in-time.

 

 

 

Lol can't blame you there.

RyanbabZ71 Senior Enthusiast

RyanbabZ71

Posted
Posted

AFM = active fuel management

 

Basically in short it takes your V-8 vehicle and turns 4 cylinders off in certain situations. So you run on 4 cylinders or 8. They added it for better gas milage.

jro909 Senior Enthusiast

jro909

Posted
Posted

remember technology is only improves...i dont see people going back to VCRs because they got a bad blu ray player....nothing is perfect and you bought the first gen of the 900s series which is almost certainly going have bugs...i'm happy with my 800 but even if i wasent i sure as hell woulden't be going to try to trade for a 400

tylerjenkins92@aol.com Senior Enthusiast

[email protected]

Posted
Posted
remember technology is only improves...i dont see people going back to VCRs because they got a bad blu ray player....nothing is perfect and you bought the first gen of the 900s series which is almost certainly going have bugs...i'm happy with my 800 but even if i wasent i sure as hell woulden't be going to try to trade for a 400

 

Exactly, be happy with what you got, remove the afm stuff if you don't like it. :thumbs: A lot of people would kill to get a 6.2 in their hands, ya know?

jhm Senior Enthusiast

jhm

Posted
Posted
remember technology is only improves...i dont see people going back to VCRs because they got a bad blu ray player....nothing is perfect and you bought the first gen of the 900s series which is almost certainly going have bugs...i'm happy with my 800 but even if i wasent i sure as hell woulden't be going to try to trade for a 400

remember they continue to look for ways to make everything cheaper too. thinner metal, less convenience features, all about the almighty buck.

pm26 Senior Enthusiast

pm26

Posted
Posted
it seems like the GMT-800 platform is far more reliable than the 900

 

Instead of the "show me the carfax" show me the data. I dont buy it. Look at all the steering shaft complaints on the GMT-800's. Engine knocking was another big issue. I had more recalls on my 2000 (2 or 3 not major but still) than on my 08 Tahoe and 10 Silverado combined (ZERO)

 

The AFM 6.2 is only used in the SUV's, the pickup 6.2 does not have AFM.

 

Also you can tune your vehicle and have AFM removed.

 

 

But the AFM lifters, which are the primary cause of oil use, stay whether you turn the AFM off, or not.

pm26 Senior Enthusiast

pm26

Posted
Posted
I don't want a Mercedes, or a BMW due to the fact they require high maintenance, and they become a nightmare after 100K.

 

I agree 100%.

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