2008 chevy tahoe question?

Question

ok, how do they do that? run on 4 cylinders until the extra power is needed then it runs on 8? seems to me that in 4 cyl mode, the re,maining 4 would become a drag on the system. any thoughts?

Answer 1

there is no "drag" on the system, only 4 cylinder are powering the car, this is to cut down on fuel consumption. Finally GM actually is getting smart about fuel consumption, but a Tahoe... Piece of crap, GM like all other American car companies are cutting corners left and right, nearly the entire dash on all GM's and Ford's are made of the same crappy cheap ABS plastic, I could go on...

Answer 2

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With Active Fuel Management™ from GM, power is delivered when you need it.

The next-generation Vortec 5.3L (standard on 2WD models, available on 4x4 models) and 6.0L V8 engines (available on 3LT and LTZ models and requires Autoride Suspension, 4.10 rear axle ratio; not available with Z71 Off-Road Suspension Package) transition seamlessly from eight cylinders to four cylinders and back again, making them both powerful and efficient. In addition, the Driver Information Center displays a message, notifying the driver of this transition.
In situations where extra power is not needed — such as cruising down the highway or on level roads — Active Fuel Management™ deactivates four of the eight cylinders with seamless precision.
When load demands increase — such as when the vehicle accelerates or travels uphill — valves are reactivated to provide eight-cylinder operation.
The bottom line: These next-generation Vortec V8 engines are more efficient in providing the energy to move the vehicle when only four of the eight cylinders are operating.

Answer 3

the computer controls the fuel rail and a solenoid the rail has the injectors and the computer turns them off, the solenoid then opens the intake and exhaust valves so no back pressure till needed