Was there a VVT motor that never had DOD?
03-18-2019, 04:48 PM
#2
TECH Senior Member
L96, L92, LY6, there might be a few others
03-20-2019, 10:46 AM
#5
TECH Senior Member
Trending Topics
03-22-2019, 04:02 PM
#8
TECH Senior Member
03-22-2019, 06:30 PM
#10
TECH Senior Member
Example: I looked at the LC9 (likely the most common aluminum block Gen 4 5.3) but not the LH6, LH8, or LH9. Is the LC9 typical in too many areas to show them all?
03-22-2019, 07:19 PM
#11
TECH Junkie
The L92 engines (2007-2008 6.2L) absolutely were built with DOD/ AFM... These engine were one of my first BIG assignments at GM Powertrain.
However software updates (PCM) were performed on vehicles, where customers had complained about engine noises. These updates would usually turn off DOD or reduce DOD operation drastically.
From what I have in my old notes:
-The L9H engines (2009- 2013) were one replacement for the L92 engine without DOD/ AFM.
-The L94 engines (2010-2014) were the other replacement for the L92 engine with DOD/ AFM.
Back in time... GM powertrain higher-ups decided that there would not be a 2009 model 6.2L with DOD/ AFM due to customer concerns over noise and DOD/ AFM system malfunction and damage (primarily DOD lifter failure).
New designed parts become available for the 2010 L94 engines.
However software updates (PCM) were performed on vehicles, where customers had complained about engine noises. These updates would usually turn off DOD or reduce DOD operation drastically.
From what I have in my old notes:
-The L9H engines (2009- 2013) were one replacement for the L92 engine without DOD/ AFM.
-The L94 engines (2010-2014) were the other replacement for the L92 engine with DOD/ AFM.
Back in time... GM powertrain higher-ups decided that there would not be a 2009 model 6.2L with DOD/ AFM due to customer concerns over noise and DOD/ AFM system malfunction and damage (primarily DOD lifter failure).
New designed parts become available for the 2010 L94 engines.
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cdeming4 (07-21-2022)
03-22-2019, 09:17 PM
#12
No l92 had dod/afm. Especially not in 2007/08.
When they did have afm they were l99 or l94. Only those 2 desinations had it. Maybe you mean vvt? Because you are mistaken on the rest.
I worked for gm in 08-10 so thats something i know.
You maybe mean the L76 car engine or l76 truck. They both had afm l76 truck had vvt also. But no 6.2l until the l99 and l94.
The first complaint i know of was in the 08 G8. Had undo vibration and harshness when in dod mode GM turned the dod off due to that but left the lifters in to fail.
When they did have afm they were l99 or l94. Only those 2 desinations had it. Maybe you mean vvt? Because you are mistaken on the rest.
I worked for gm in 08-10 so thats something i know.
You maybe mean the L76 car engine or l76 truck. They both had afm l76 truck had vvt also. But no 6.2l until the l99 and l94.
The first complaint i know of was in the 08 G8. Had undo vibration and harshness when in dod mode GM turned the dod off due to that but left the lifters in to fail.
03-22-2019, 09:57 PM
#13
TECH Junkie
I do mean the L92 engine... Yeah I figured someone here was not going to believe me... :-(
This engine was only produced for two model years... 2007 and 2008.
I also was working for General Motors/ Delphi Electronics as a Powertrain division engineer at that time.
The 2007 GMC Yukon XL Denali that I have owned since new came with the L92 engine and DOD/ AFM as well as VVT.
According to my old notes... the following transpired for L92 engines (2007-2008):
-the oldest vehicles (built 2006) were built and shipped with DOD/ AFM and was a functional system... Which with software updates was later deactivated.
-the next batch to go out (early 2007) were built and shipped with DOD/ AFM but was a non-functional deactivated system.
-the last batch that was for the 2007 models and carried into 2008 models; were built and shipped without DOD/ AFM.
My truck and the earliest produced have the DOD/ AFM valley cover (Valve body/ actuator assembly), lifters, and electrical connections.
Shortly after that, the hardware remained and the software omitted the function of the DOD/ AFM system.
VVT hardware and software went unchanged throughout this period.
Now I am glad I saved the orignal engine from my truck... The truck is all custom now as a truck class race vehicle with almost no original parts...
This engine was only produced for two model years... 2007 and 2008.
I also was working for General Motors/ Delphi Electronics as a Powertrain division engineer at that time.
The 2007 GMC Yukon XL Denali that I have owned since new came with the L92 engine and DOD/ AFM as well as VVT.
According to my old notes... the following transpired for L92 engines (2007-2008):
-the oldest vehicles (built 2006) were built and shipped with DOD/ AFM and was a functional system... Which with software updates was later deactivated.
-the next batch to go out (early 2007) were built and shipped with DOD/ AFM but was a non-functional deactivated system.
-the last batch that was for the 2007 models and carried into 2008 models; were built and shipped without DOD/ AFM.
My truck and the earliest produced have the DOD/ AFM valley cover (Valve body/ actuator assembly), lifters, and electrical connections.
Shortly after that, the hardware remained and the software omitted the function of the DOD/ AFM system.
VVT hardware and software went unchanged throughout this period.
Now I am glad I saved the orignal engine from my truck... The truck is all custom now as a truck class race vehicle with almost no original parts...
03-22-2019, 10:01 PM
#14
Well i dont believe you because not only did i see hundreds of l92s torn apart but also sold them the replacement engines.
The dod setup originally came from Australia also. They started using it before us.
I can also go and pull just as many personal tune files and online stock files and no dod.
Vvt hardware did in fact change at least 2x also.
Im not sure where you are getting your info from, but it really doesnt seem first hand.
The dod setup originally came from Australia also. They started using it before us.
I can also go and pull just as many personal tune files and online stock files and no dod.
Vvt hardware did in fact change at least 2x also.
Im not sure where you are getting your info from, but it really doesnt seem first hand.
03-22-2019, 10:17 PM
#15
Launching!
My L92- pulled from an 07 Denali, absolutely does not have dod/afm, but does have VVT. Having had my engine open, I’m 100% sure.
It is my understanding that all L92’s had only VVT, though engines produced before April in 06 actually had the AFM components in them, but were never active from the factory.
Here is a source that confirms this:
https://www.onallcylinders.com/2018/05/31/l92-6-2l-engine-specs-performance-bore-stroke-cylinder-heads-cam-specs
Nick
It is my understanding that all L92’s had only VVT, though engines produced before April in 06 actually had the AFM components in them, but were never active from the factory.
Here is a source that confirms this:
https://www.onallcylinders.com/2018/05/31/l92-6-2l-engine-specs-performance-bore-stroke-cylinder-heads-cam-specs
Nick
Last edited by nicke; 03-22-2019 at 10:43 PM.
03-22-2019, 10:26 PM
#16
TECH Senior Member
06 and before L92 engines had the DOD gear installed, but NOT activated. After that had none of the DOD components at all. My source is the Summit LS Engine Spec article.
03-22-2019, 10:38 PM
#17
TECH Junkie
Well i dont believe you because not only did i see hundreds of l92s torn apart but also sold them the replacement engines.
The dod setup originally came from Australia also. They started using it before us.
I can also go and pull just as many personal tune files and online stock files and no dod.
Vvt hardware did in fact change at least 2x also.
Im not sure where you are getting your info from, but it really doesnt seem first hand.
The dod setup originally came from Australia also. They started using it before us.
I can also go and pull just as many personal tune files and online stock files and no dod.
Vvt hardware did in fact change at least 2x also.
Im not sure where you are getting your info from, but it really doesnt seem first hand.
As I am certain that you do not care either...
I do not benefit from someone here on LS1Tech believing me... nor do I benefit when I am not believed...
I stop by here as many people do, to try and offer information and opinions. Help out somebody with similar interest.
I am sure, you do the same thing.
It is wonderful that you have seen hundreds of L92 engines apart and have sold them as replacement engines. Congratulations and thank you for contributing to this community :-)
My information comes from one place, as I have been with GM powertrain (the combination of the former GM engine and Hydra-matic divisions) and the now defunct Delphi electronics (the former Packard electrical division).
In doing so, the information and reports generated by people like me are what ends up going to GM ASEP, GM TAC, GM TEC (The GM automotive service educational program, The GM technical assistance centers, The GM training and educational centers)
Some of my information is not often know... being that it is not public information.
As I stated... I am not surprised that someone did not believe me... You don't know me, why would you believe me? You have no reason to, and that is fine my me :-)
We have established that neither of us care what the other believes... now thats out of the way...
From 2007 to 2008 there were NO VVT hardware changes with the L92 engines... Outside of the 2007-2008 L92 engines; there were several VVT system changes.
03-22-2019, 11:01 PM
#19
TECH Junkie
O Look! another typo... I typed the letter "M" instead of "B" for the word "by"... I typed "my"...
Do I have to hear about that mistake too?
Do I have to hear about that mistake too?
03-22-2019, 11:19 PM
#20
Launching!
-Nick
