6.2L (L9H) Owners - Get all your questions answered here

[11Silvy]

Has anyone put a K&N Cold Air Induction on the 6.2 and if so whats the results?

 

 

around 10hp or so from airaid jr. on mine.

[David_L6]

How is the 6 speed mated to the 6.2L? My brother in law has a '12 5.3 w/6speed and hates the tranny, claims it hunts alot and not smooth, I've never driven it. I like my '08 5.3 4 speed, but am seriously considering ordering a 6.2L next year. Likes/dislikes? Thanks.

 

 

I've had two Silverados with the 4 speed and my current truck with the 6 speed. I could deal with either but I prefer the 6 speed.

[ChevyTech77]

The GM programming for the 6-speed can be pretty lame as the emphasis from the factory is maximum mileage (CAFE numbers). Back in 2008, the two biggest complaints were the truck not down-shifting quick enough up slight hills and a long delay downshifting when you punched it above 30mph (think on-ramp). GM came out with a transmission program (a TSB) that helped somewhat but it didn't cure all.

 

Getting an engine tune helps smarten up the shifting quite a bit. Getting an engine/tranmission tune via the AutoCal is the ultimate answer. You actually download a separate transmission tune file that smarten's it right up. If I'm climbing a hill and depress the pedal even a smidgen, it drops a gear instantly. Seamless!

 

I don't know why GM doesn't have this solved yet. You would think they could add a switch similiar to the "Tow/Haul" button for performance or "Sport" mode like Toyota used to offer years ago, and maybe keep their CAFE averages.

 

Its called torque management. Almost every GM vehicle has had some form of it for years now.

 

Try rolling on the throttle instead of stomping it to the floor. Big difference. Again, torque management.

 

Torque management was put in place for a lot of reasons but mainly to help the powertrains easily live past their 5 year/100,000 mile warranty.

 

[Likarok]

Going to take mine for a little drive. Going to Missouri next week (flyng) to a conference and when I get home the wife and I are driving to Mesa AZ. pulling my Haulmark low hauler with my HD. I have done this trip a number of times but not with my 6.2. Usually can do it in two full days.........So what kind of milage will I get? With the 5.3 I got around 15mpg.

Edited October 25, 2012 by Likarok

[bogeypro]

My boat weighed around 6000lbs. I could get around 12 with the 6.2. My previous 5.3 would only get about 9 with the same boat.

[Likarok]

So I made it down to Mesa in one 13 hr day and one 12 hr day. The DIC says I got 14 mpg. Actually though I think my shortbox with a 5.3 handled the trailer just as good and I got 15 mpg with it.

 

Anyways when I was just about to Mesa the DIC told me to "Service the 4 wheel drive system". I looked at the 4x4 dial and while the dial was in 2high the light says the truck is in Auto. Bizarre!

 

So I will get it into Power Chevrolet here in Mesa and see what is up with that.

Edited November 5, 2012 by Likarok

[Nvd]

Question: A 2008 6.2L Sierra Denali, would they have basically the same parts as the 5.3l V8? Ie. wheels bearings, tie rods, pwr window motors, ball joints, windsheild, etc, like your everyday parts that might need replacing after such a time?

 

I know the suspension,awd system, brakes i think (and maybe more) are different..

 

My dad has a CTS, and since its a cadi, all the parts are jacked up... wondering if its the same as the denali, or its just a fancy version of the sierra?

 

thx!

[Raced Guy]

Does anyone else with the 6.2 get piston slap. Mine has 28k on it now and its below 30 here and even if I let it warm up for a minute or two it sounds terrible. It remimds me of my old mans 2000 5.3 wirh 315k. I've noticed this summer it sounds like its developed lifter noise on the left side. I really don't even wanna take it in because I know the response.

Edited November 26, 2012 by Raced Guy

[RyanbabZ71]

Nope knock on wood, my 2000 was pretty noticable but never had issues with it.

 

 

Ryan

 

Do you garage it?

 

 

Ryan

[Raced Guy]

I do but i car pool so i will start it and let it run for about 2 minutes and then go. If its colder than about 15 i give it 5 minutes atleast usually. My free onstar is expired so i cant use the app on my phone anymore to start it. Today it was only 25 which isnt to cold at all, it just seems a ton more noticeable than last year when it was basically new. My 06 vortec max didnt make a peep, my moms 03 denali is quiet with alot of miles on it, old mans 00 has piston slap his 07 5.3 doesnt. We have gmt800/900s at work and they are all quiet except our 01 6.0. Just bugs me my 6.2 does i guess.

Edited November 27, 2012 by Raced Guy

[GMCustomerService]

Does anyone else with the 6.2 get piston slap. Mine has 28k on it now and its below 30 here and even if I let it warm up for a minute or two it sounds terrible. It remimds me of my old mans 2000 5.3 wirh 315k. I've noticed this summer it sounds like its developed lifter noise on the left side. I really don't even wanna take it in because I know the response.

 

 

Have you had a chance to bring this to the attention of your local dealer? I can look into this for you as well with the last eight of your VIN. Contact me privately for more assistance. Thank you.

 

Tricia, GM Customer Service.

[Nvd]

Anyone here have a 07-08 6.2l v8 and have a issue with a seal going? Apparently there was a recal.. I spoke to a person that told me this who owns a 08 Denali. I called GM and they didn't know what I was talking about, only recall they knew of was a tps. Thx

[11Silvy]

I do but i car pool so i will start it and let it run for about 2 minutes and then go. If its colder than about 15 i give it 5 minutes atleast usually. My free onstar is expired so i cant use the app on my phone anymore to start it. Today it was only 25 which isnt to cold at all, it just seems a ton more noticeable than last year when it was basically new. My 06 vortec max didnt make a peep, my moms 03 denali is quiet with alot of miles on it, old mans 00 has piston slap his 07 5.3 doesnt. We have gmt800/900s at work and they are all quiet except our 01 6.0. Just bugs me my 6.2 does i guess.

 

 

I'd make a service call to your dealer. This isn't normal. I have a 2011 6.2 as well. I live in Texas and it never gets below 30 lol here in Htown, but I ran synthetic after 1000 miles just to be safe.

[Raced Guy]

I changed the oil at 500 miles, 1200 miles and then switched to full syn. I'm super anal about the maintenace on my truck service. I just hate going to a dealer for service. I was an ase certified tech for years so I'm not clueless by any means and some of the stuff they have said and done just scares me. I'm sure there are many excellent service departments, I just need to find one.

[Wolfmanjohn]

I changed the oil at 500 miles, 1200 miles and then switched to full syn. I'm super anal about the maintenace on my truck service. I was an ase certified tech for years so I'm not clueless by any means...

 

Perhaps with all those early oil changes, the motor/rings never fully seated or wore in?