[Shop-talk] Geneeral Motors Active Fuel Management (DOD) problem

[John Innis]

In my experience, it is a combination of things that cause issues with the
AFM system.  The first (and in my opinion most common) is not doing proper
maintenance.  A conservative oil change interval with a good quality engine
oil seems to go a long way to heading off issues with AFM on the LS
motors.  The next biggest issue in my opinion is the quality of the lifters
that GM used from the factory.  I have had several engine builders that I
trust say that using a better quality aftermarket lifter in the AFM valves
is the best insurance you can buy on a build.  Therein is the biggest issue
with many of the DOD delete methods being offered.  They frequently only
address the ECU, taking the AFM out of the tune.  This will NOT solve
issues caused by low quality lifters failing when AFM is not activated, it
can still happen.  I don't have experience with the plug in modules, so I
can't say if they are safe or not, but like the tune, they don't address
the potential problems in the lifters.  I also don't know that much about
what Jasper is putting in their remans, so I can't say if they are going to
cause you problems or not.

On Wed, Feb 14, 2024 at 3:08 PM john <jniolon at att.net> wrote:

> Does anyone have any experience with the GM DOD system ?  Specifically
> deleting by software or the WWW-offered module that eliminates
> the dropping to V4 under light load.
>
> I lost an engine due to this problem at 130K and replaced it with a Jasper
> crate engine that does have the DOD included.
>
> Need some guidance from some that have hands on experience with this.
> Does the Module that plugs into the BOD plug actually work and is it safe
>
> OR is a software tune required?? or must I go thru the tear down and
> install of a delete kit
>
> thanks
> john
>
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