Does the Chevy 6.6 have an AFM?
Yes, the Chevy 6.6-liter V8 engine, also known as the Duramax diesel, does have an Active Fuel Management (AFM) system. The AFM system is designed to improve fuel efficiency by temporarily deactivating some of the engine's cylinders under certain driving conditions.
What is Active Fuel Management (AFM)?
Active Fuel Management (AFM), also called Displacement on Demand (DoD) or Cylinder Deactivation, is a technology used in some engines to improve fuel efficiency. The system works by temporarily deactivating some of the engine's cylinders when the full power of all cylinders is not needed, such as during light-load driving conditions. This reduces the engine's fuel consumption and emissions without sacrificing performance when more power is required.
How Does the AFM System Work in the Chevy 6.6 Duramax?
The Chevy 6.6-liter Duramax diesel engine uses an AFM system to improve fuel efficiency. The system is designed to deactivate four of the engine's eight cylinders when the vehicle is operating under light-load conditions, such as cruising on the highway. This reduces the engine's fuel consumption without compromising performance when more power is needed, such as during acceleration or towing.
The AFM system in the Chevy 6.6 Duramax is controlled by the engine's electronic control unit (ECU), which monitors various engine parameters, such as load, speed, and throttle position, to determine when to activate or deactivate the cylinder deactivation feature.
Benefits of the AFM System in the Chevy 6.6 Duramax
The main benefits of the AFM system in the Chevy 6.6 Duramax diesel engine include:
- Improved Fuel Efficiency: By temporarily deactivating four of the engine's eight cylinders, the AFM system can improve fuel efficiency by up to 6% in certain driving conditions.
- Reduced Emissions: The reduced fuel consumption resulting from the AFM system also leads to lower emissions, making the engine more environmentally friendly.
- Maintained Performance: The AFM system is designed to seamlessly activate and deactivate the cylinders, ensuring that the engine's performance is not compromised when more power is needed.
Overall, the Chevy 6.6 Duramax diesel engine's AFM system is an important feature that helps to improve the engine's fuel efficiency and reduce emissions without sacrificing performance.
Does the 6.6 have an AFM?
6.6L L8T doesnt have AFM/DFM.
What Chevy engines do not have an AFM?
The LM2 Duramax 3.0L turbo-diesel, the L8T 6.6L V8, and the LS3 have neither AFM nor the latest version, called DFM (Dynamic Fuel Management). In addition, some 5.3L V8s from 2021 and 2022 don't include either fuel-saving system due to semi-conductor shortages manufacturers were dealing with during that time.
What is the life expectancy of a 6.6 L V-8 gas engine?
around 200,000 miles
Overall, the average life expectancy of a 6.6 Duramax engine falls around 200,000 miles or 320,000 km, depending on driving behaviours, usage, and how often the engine is maintained.
What cylinders shut down on AFM?
AFM (Active Fuel Management)
To provide maximum fuel economy under light load driving conditions, the engine control module (ECM) will command the cylinder deactivation system ON to deactivate engine cylinders 1, 7, 6, and 4, switching to a V4 mode.
Can GM AFM be turned off?
An AFM Disabler is an electronic device that plugs into the OBD-II port, under the dashboard. It prevents the computer from switching over to 4 cylinder mode. It's a simple and effective way to turn off the AFM system. It will also improve the sound of the exhaust.
What Chevy vehicles have AFM?
General Motors added Active Fuel Management to the following vehicles sold under the Chevrolet brand.
- Chevrolet Camaro.
- Chevrolet Tahoe.
- Chevrolet TrailBlazer.
- Chevrolet Avalanche.
- Chevrolet Silverado.
- Chevrolet Suburban.
- Chevrolet Impala.
What cylinders have AFM lifters?
Lifters - AFM engines use special lifters for cylinders 1, 4, 6, and 7. They are taller and have special oil holes.
Is the 6.6 gas Chevy reliable?
Unfortunately, the Chevy 6.6 system is prone to trouble and has even created recalls for the system. Watch for excessive oil consumption, engine failure, strange noises, exhaust leaks, and timing chain issues, to name a few. There are clear symptoms associated with these items.
Does the Chevy 6.6 have cylinder deactivation?
I know it's built with forged rods and crank… it does NOT have cylinder deactivation.
Does GM make a 6.6 L gas engine?
6.6L V-8 L8T Features & Specifications
The L8T is meant for grunt work, thanks to an impressive 464 lb-ft. of peak torque that arrives 200 rpm sooner (and is 22 percent more) than GM's previous 6.0L V-8 HD gasoline engines.
