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AFM

This is a discussion on AFM within the Internal Engine forums, part of the LSx Technical Help Section category; Could someone explain to me how AFM(active fuel management) works? Does is work with the ecm? What components of the ...

  1. #1
    Junior Member askkmb's Avatar
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    AFM

    Could someone explain to me how AFM(active fuel management) works?

    Does is work with the ecm? What components of the engine have something in common with AFM?

    Please, could someone answer me those question? BTW im talking from an 2007 5.3 if someone needs to know

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    None Shall Pass Knight's Avatar
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    In 2004, the electronics side was improved greatly with the introductions of Electronic Throttle Control, electronically controlled transmissions, and transient engine and transmission controls. In addition, computing power was vastly increased. A solenoid control valve assembly integrated into the engine valley cover contains solenoid valves that provide a pressurized oil signal to specially designed hydraulic roller lifters provided by Eaton Corp. and Delphi. These lifters disable and re-enable exhaust and intake valve operation to deactivate and reactivate engine cylinders. Unlike the first generation system, only half of the cylinders can be deactivated. It is notable that the second generation system uses engine oil to hydraulically modulate engine valve function. As a result, the system is dependent upon the quality of the oil in the engine. As anti-foaming agents in engine oil are depleted, air may become entrained or dissolve in the oil, delaying the timing of hydraulic control signals. Similarly engine oil viscosity and cleanliness is a factor. Use of the incorrect oil type, i.e. SAE 20W40 instead of SAE 20W50, or the failure to change engine oil at factory recommended intervals can also significantly impair system performance.

    In 2001, GM showcased the 2002 Cadillac Cien concept car, which featured Northstar XV12 engine with Displacement on Demand. Later that year, GM debuted Opel Signum˛ concept car in Frankfurt Auto Show, which uses the global XV8 engine with displacement on demand. In 2003, GM unveiled the Cadillac Sixteen concept car at the Detroit Opera House, which featured an XV16 concept engine that can switch between 4, 8, and 16 cylinders.

    On April 8, 2003, General Motors announced this technology (now called Active Fuel Management) to be commercially available on 2005 GMC Envoy XL, Envoy XUV and Chevrolet TrailBlazer EXT using optional Vortec 5300 V8 engine. GM also extended the technology on the new High Value LZ8 V6 engine in the Chevrolet Impala and Monte Carlo as well as the 5.3L V8 LS4 engine in the last generation Chevrolet Monte Carlo SS and Pontiac Grand Prix GXP. In both designs, half of the cylinders can be switched off under light loads.

    On July 21, 2008, General Motors unveiled the production version of the 2010 Chevrolet Camaro. The Camaro SS with an automatic transmission features the GM L99 engine, a development of the LS3 with Active Fuel Management which allowed it to run on four cylinders during light load conditions.

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    None Shall Pass Knight's Avatar
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    Info I gathered from Wikipedia.

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    Junior Member askkmb's Avatar
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    Okay thank you, but i still have one question.

    Do you think the engine i mentioned before(5.3) is possible to install in an 2004 silverado with its ecm(2004 silverado) and still having the afm work? Or do i have to delete it?

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    Best bet is always to keep the engine, harness and PCM all together for a swap. Unfortunately, I have no idea if you can just drop the engine in. Another thing you need to check is the crank reluctor -- earlier LS based engines were all 24x while the newer engines are 58x.

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    Junior Member askkmb's Avatar
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    I know that the crank reluctor are different but Lingenfelter makes an adapter for the Gen III pcm to accept the 54x crank reluctor. So i just need to know if i would have to change something(AFM-wise) to make the engine fully work with the Gen III pcm/ecm or would it be better just delete the AFM?

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    Junior Member askkmb's Avatar
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    Anyone, please?

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