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The hot film MAF sensor works somewhat similar to the hot wire MAF sensor, but instead it usually outputs a frequency signal. This sensor uses a hot film-grid instead of a hot wire. [3] It is commonly found in late 1980s and early 1990s fuel-injected vehicles. The output frequency is directly proportional to the air mass entering the engine.
This requires the use of an alternative method of calculating airflow into the engine, which is also referred to as 'Speed-Density' system, as opposed to a MAF system. On vehicles so equipped, this alternative involves the use of a manifold absolute pressure, or MAP, sensor. The MAP sensor measures pressure in the engine's inlet manifold.
Three-way catalytic converter, wide-band heated oxygen sensor The GM L3B engine is a turbocharged four-cylinder gasoline engine designed by General Motors. It is an undersquare aluminum DOHC inline-four displacing 2.7 liters (165 cid) and tuned for strong low-end torque.
The Generation III small-block V8 is a "clean sheet" General Motors design ... an intake manifold and MAF-sensor with higher ... 2007–2013 Chevrolet Silverado 1500;
It is a one-to-one relationship with an offset of -100 kPa for boost pressure. Thus, a MAP sensor will always read 100 kPa more than a boost sensor measuring the same conditions. A MAP sensor will never display a negative reading because it is measuring absolute pressure, where zero is the total absence of pressure.
In January 2018, GM announced an improved version of AFM called Dynamic Fuel Management to be initially released in Chevy Silverado trucks. This system shuts off any number of cylinders in a variety of combinations, maximizing fuel economy and avoiding switching between banks of cylinders.
Despite using the Silverado nameplate, the vehicle does not share its underpinnings with the ICE-powered Silverado, as it is built on a narrower version of the dedicated electric platform used by the GMC Hummer EV. The Silverado EV is the first Chevrolet-branded electric pickup truck since the experimental S-10 EV and VIA VTRUX. [4]
On November 26, 1983, a Texas Western Aviation Beechcraft King Air crashed on final approach to MAF after initiating a go-around. The plane pitched up in an extremely nose high attitude, entered a left bank, stalled and crashed. All eight occupants (one crew, seven passengers) were killed.