L92 6.2 Issues and Fixes for the incredulous NOOB

[kctyler]

Mine is loud inside, can hardly hear it outside. I took a co worker home the other day. He asked, "why does this sound like a diesel".

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[JML07denali]

Mine is loud inside, can hardly hear it outside. I took a co worker home the other day. He asked, "why does this sound like a diesel".

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Haha I get it all the time. I now just say I have a duramax in it.

 

[MontanaBoy]

Oil wasn't bad at all but was from the previous owner and I dont have a clue what it was. I think it was cheap conventional to go along with the cheap generic filter.
Yeah I'm pretty familiar with the typical cold engine piston slap but I do have a noticeable noise at operating temp. How about any of the rest of the stuff? Cam and lifters common on this motor?

 

[tomustang]

What gas are you giving it? Do 89, if you are then try 91/93

 

[kctyler]

I have tried different oil filters, Lucas oil additive, Marvels, and I always run 91 with Mobil 1 full synthetic 5w30. Nothing I do makes any difference at all. Until the engine warms up, that damn tick is there. I did however notice with a K&N oil filter my oil pressure is more consistent.

 

[BlackOh7on22s]

Just an FYI, Napa oil filters are actually made by WIX filters. The oil pressure switches are known to be faulty also on these

 

[MrMyers]

From Summit Racing :

Intro to the L92, L9H, and L94​

LS Family: Gen. 4, 6.2L, Aluminum Block, Truck Engines​

L92​

The L92 was introduced in 2007 for GM luxury pickups and SUVs. It was the first 6.2L LS truck engine. It was commonly known as the Vortec 6200.

L9H​

The L9H replaced the L92 in 2009. It was upgraded with Flex Fuel capability. The L9H was also known as the Vortec 6200. It was available until 2013.

L94​

The L94 was introduced in 2010. It was a premium option in the Escalade and Yukon SUVs until 2014. The L94 added Active Fuel Managment (AFM) technology for better gas mileage. It was also known as the Vortec 6200.
For specific details about these engines, please follow the links below:

• Chevy L92 Engine Specs
• Chevy L9H Engine Specs
• Chevy L94 Engine Specs
• Upgrading the L92, L9H, and L94 Engines

Benefits​

These engines are truck versions of the high performance LS3. The stock engines all make over 400 hp.
The engine blocks have the same casting number as the LS3 and L99. They share a 4.065 in. bore, Variable Valve Timing (VVT) and rectangle port heads. The blocks also have the internal oil passages for AFM.
The cylinder heads are dimensionally the same as the LS3. However, they have different casting numbers. They used different valves, camshaft, intake manifold, injectors, pistons, etc. This helped them make more Torque lower in the rpm range. However, it did limit the top-end Horsepower.
These engines can be bored and stroked up to 427 c.i.d. (7.0L). With upgraded internals, they can handle around 1,000 hp.

What's the difference?​

The easiest way to tell the difference is to check the 8th digit of the VIN code.

• Follow this link to Identify an LS Engine by VIN.

The difference between these engines is the special technology they used.

• For fuel compatibility, pull the injectors.
• • Standard injectors have 2 holes in the end of the nozzle.
  • Flex Fuel injectors have 4 holes in the end of the nozzle.
• Follow the links provided above to identify AFM and VVT engines.

RPO Code	AFM	VVT	Flex Fuel
L92	No	Yes	No
L9H	No	Yes	Yes
L94	Yes	Yes	Yes

After talking to a service tech at my GM dealer, he confirmed that the only difference between the L92 and L9H is the injectors. He also stated that when running E85 in the flex capable motors, they run hotter, and to me that means shortening the potential service life of the engine. But upgrading the injectors to the 4 nozzle type and reprogramming the ECM for those injectors, and running 87 octane fuel with the GM specified AC Delco oil filter might help with the noise at temperature. Otherwise, valve jobs on both banks will get it gone.

 

[rdezs]

Lol....thank you Mr Myers. The guys been waiting for someone to respond to that post since 2016. I'm on the edge of my seat wondering if he's going to respond 9 years later ;-)