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

RyanbabZ71
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SILVERADOSC540 Senior Enthusiast

SILVERADOSC540

Posted
Posted

Raced Guy said "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."

Have you checked your exhaust manifold bolts on the driver's side? Had the slap in my '02 2500HD, never caused a problem. Thought I had it in my '07 vmax, turned out to be a broken manifold bolt, driver's side rear. My exhaust guy told me it was common. I've heard two reasonings. He had heard that it was the iron manifold and aluminum head heating up at different rates, someone else told me it was from torque twist and short exhaust hangers. Either way it couldn't hurt to check.

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DanMan_S
DanMan_S

This is a video showing how the 6.2L sounds with headers and a corsa catback. The crew cab is my 6.2L, the 2005 extended cab is a 5.3L with a magnaflow muffler welded in.    

gonzoid
gonzoid

finished product  

2010LTZ4x4
2010LTZ4x4

Where did you get the 6.2L badge in you avatar?  Heres the info for the 6.2L badge Top Flight Reproductions is proud to announce the addition of the 6.2L emblem to our emblem product line. This embl

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Raced Guy Enthusiast

Raced Guy

Posted
Posted

Funny you mention that, we did have that issue with my moms 03 denali. Unfortunately it is not a broken bolt/exhaust leak, i would be glad if it was !

Likarok Senior Enthusiast

Likarok

Posted
Posted (edited)

Back home from Mesa. Stored trailer and bike for return in the spring and maybe a week in Feb.

 

Wow! The 6.2 got an amazing 21mpg on the return to Canada trip. I was totally surprised.

Edited by Likarok
  • 2 weeks later...
badbowtie001 New Member

badbowtie001

Posted
Posted

I have had my new 2013 Sierra Max for about 3 weeks now and couldn't be happier with the power and performance. Today I did my first trailer towing and the torque monster just climbs those hills effortlessly! I do find I have suffered some on handling with the 2013 as compared to my 2009 which probably has to do with the smaller tires and wheels. Could anyone comment on whether they have changed to 20" tires with the NHT package and if it made any significant difference in towing?

EX-F150 owner Enthusiast

EX-F150 owner

Posted
Posted

I have had my new 2013 Sierra Max for about 3 weeks now and couldn't be happier with the power and performance. Today I did my first trailer towing and the torque monster just climbs those hills effortlessly! I do find I have suffered some on handling with the 2013 as compared to my 2009 which probably has to do with the smaller tires and wheels. Could anyone comment on whether they have changed to 20" tires with the NHT package and if it made any significant difference in towing?

 

Not the 20's but I did swap over to a set of the Z71 18's. When I measured the wheels they were the same overall diameter and I check my speedometer with a GPS and it was the same. No difference in performance either. I do like the older version Texas Edition 20's but they are taller and I am thinking they would not ride as soft because of the wheel size.

  • 3 weeks later...
wyefox Enthusiast

wyefox

Posted
Posted

Badbo: I swapped my 17s for factory 20s (GMC Sierra/DenaliALY 5419 with Goodyear Eagle LS-2 P275/55R20) on my 2010 NHT LT Crew. I commute about 100 miles a day. The ride is a little firmer/sportier. Overall tire size is the same so no change in speedo (per GPS) and no loss of gas mileage (I average 17-18 mpg consistently).

 

I also tow a 30' utility trailer with 6-7000 lbs for weekend high school band trips with absolutley no problems with stopping, starting or swaying.

 

Black with "4X4" decals deleted and the 20s frequently garners compliments!

dgrinnell Enthusiast

dgrinnell

Posted
Posted

Well Ive been lurking on this site for two weeks now and thought I give my new baby some credit. On Dec 14th I traded in my 2008 Avalanche in on a New 2012 Silverado LTZ crew cab 6.2L. Man I love this truck! So much more power!! Already Ive have added a K&N drop-in, tint, hood decales, bed cover, nurf bars and weathertec floormats. Next thing I need to figure out is how to add a picture on here...

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dgrinnell Enthusiast

dgrinnell

Posted
Posted (edited)

So happy to be part of this group!

Edited by dgrinnell
  • 2 weeks later...
dgrinnell Enthusiast

dgrinnell

Posted
Posted

Are you running just the RC leveling kit for front only?

 

 

 

Well, it gets you the 6.2L, HD springs, HD locker, and 3.73 gears mainly.

 

Off GM's website.

When equipped with the awesome Max Trailering Pack, a Silverado® Crew Cab™ can haul up to 1980 lbs.1 of whatever it takes to get the job done, and Extended Cab models can tow up to 10,700 lbs.2 The package includes the powerful Vortec® 6.2L V8 SFI engine, heavy-duty automatic locking rear differential, Handling/Trailering Suspension Package, 9.5" rear axle, 3.73 rear axle ratio, 4 – 17" x 7.5" 6-lug aluminum wheels, P265/70R17 on-/off-road blackwall tires, fog lamps, front and rear disc brakes and Trailering Package. Standard Box only. Not available on Z71® Off-Road Package.

1 Maximum payload capacity includes weight of driver, passengers, optional equipment and cargo.

2 Maximum trailer weight ratings are calculated assuming a properly equipped base vehicle plus driver. See dealer for details.

 

 

In order to choose this feature, you also need to add: Vortec 6.2L Variable Valve Timing V8 SFI engine -GVWR, 7300 lbs. (3311 kg) -Rear axle, 3.73 ratio17" x 7.5" 5-spoke aluminum wheelsOn-/off-road blackwall tiresAntilock 4-wheel disc brakes

 

Robert1 Enthusiast

Robert1

Posted
Posted (edited)

Been out of pocket for some time and recently returned from a trip through the Sierra Nevadas in November.Truck performed flawlessly. Noticed I hadn't posted up in this thread so here it is.

 

This first one is a sort of crappy shot in the garage of one of the aluminum and black enamel 6.2L badges I added some months ago.

 

IMAG0457.jpg

 

 

 

IMAG0426.jpg

Edited by Robert1
  • 2 weeks later...
Nvd Enthusiast

Nvd

Posted
Posted

Whats the best or a good kind of spark plugs to use in a 2010 sierra denali 6.2l? If possible some to increase MPG but overal just want some good ones in there, truck has 70,000km so wouldn't hurt to change them. I have already installed a new k&n air filter, wanna change the plugs and then the oil with mobil 1 synthetic!

 

Thanks in advance for any input on the plugs!

Chris Senior Enthusiast

Chris

Posted
Posted

Starting in 03/04 GM trucks came with Iridium plugs which are good to 100,000 miles. When changing I would change to AC Delco iridium plugs

 

Sent from my DROID RAZR MAXX using Xparent Red Tapatalk 2

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