American V8 engine switches off cylinders?

Question

Can anyone tell me the American manufacturer that has a V8 engine that can switch off cylinders for efficiency when it is under low demand? I can't remember, I've read about it before on their website and now can't remember who it was.

Thanks

Answer 1

2005+ Pontiac Grand Prix GXP
2005+ Chevy Monte Carlo SS
2005+ Chevy Impala SS
They are also putting this on the new Chevy and GMC trucks.

Answer 2

Cadillac tried it in the early '80s with a disasterous 8-6-4 engine. That thing broke way too often.

Chrysler brought the idea back with their new Hemi, and GM has been using it on some of their cars too. I think all three systems I mentioned (Cadillac, Chrysler, and modern GM) work in different ways.

Answer 3

If you have a carb check the idle screw. make sure you bring the idle to normal in drive. Thus screw is also a fast idling screw. In the cold weather. there is a little cam on the carb which goes to a third step and makes the car idle fast to reach operating temperature. If the throttle is close abruptly when you turn the engine off. the car "diesels". To prevent this the car makers have a devise that is electronic and its called an anti-dieseling solenoid this screw of this solenoid must touch the cam if it doesn't turn this screw with a open end wrench until it touches. The car must be running and someone must be in the car to put it in stationary "drive" and adjust the idle accordingly. check to see if the screw goes down. adjust the screw until there is no more dieseling when you turn off your car,

Answer 4

Cadillac was the first with one one they called 4-6-8..
none of these work the pistons still drag up and down the cylinders it's a sales gimmick

Answer 5

GM does it on their Tahoe crowd of SUVs and Trucks, maybe something else, not sure.
Dodge does this on their Hemis, though the only one I've seen advertised with this is the Durango, and obviously it's twin the Chrysler Aspen.

Answer 6

generalmotors

Answer 7

G.M.