Overdrive is the normally allowed position
If the vehicle is shut off and then restarted , the overdrive will be allowed
To turn off the overdrive feature , the button on the end of your gear selector has to be pushed and the O/D OFF light comes on in your dash ( if you push the button again the O/D OFF light will go out and the overdrive feature is allowed )
Take it in. There is either a problem with your transmission or with the overdrive switch itself. Overdrive switch should be a lot cheaper to fix. I'm assuming the light not only goes on, but the overdrive physically turns off as well when the light is on.
The button turns the Overdrive on and off. Leave it on unless you are towing something.
Turns the Overdrive on and off. Used for towing because you should never tow with the transmission in overdrive.
The button does not switch from Overdrive to Automatic. The button just turns the overdrive off. Overdrive is not a separate drive system as your question implies. Normally you leave the car in overdrive mode. That way the transmission shifts into overdrive at highway speeds, thus saving fuel. If you are saying the transmission is stuck in overdrive and it will not disengage then seek out a A/T professional.
On my 1994 there is a button in the end of the gear shift arm. This turns off the overdrive and the dash says "Overdrive Off" above the odometer and gas mileage messages. Other than that, I don't know.
It should indeed stand for Electronic Controlled Transmission. It will basically make the transmission delay shifting until the engine revs higher, giving you a bit more power. There should also be a button on the gear selector itself that probably turns on and off the overdrive, as described below. Of course the problem with running your car in ECT mode, means you will be using more gas. This is either the Overdrive button or the Traction Control button. On this car, I think this stands for Electronic Controlled Transmission, which means it turns the overdrive on an off. While traveling at 50 mph push the button. If you hear and see the engine rpms go up on the tach, this is the overdrive button.
my stereo turns itself off
It turns off by itself.
SPIN ITCH! Get it?!
There are many possible meanings to the word overdrive. Many people use the word overdrive to mean going beyond normal. As far as automotive terms go, overdrive simply means that the transmission output shaft spins at a faster rate than the input shaft. So, for example, if a transmission had a .70 overdrive ratio, then the transmission output would spin one full turn for every .70 turns of the input shaft.
No. Overdrive causes the engine to turn slower at any given speed. Its main use is to improve fuel mileage. In a transmission without overdrive, when you select high gear, the transmission ratio is one-to-one, written as 1:1. This means each time the engine makes one revolution, the output shaft (driveshaft in a rear-wheel-drive car) also turns one revolution. In a car with overdrive, there is one more gear. When in overdrive, each time the engine makes one revolution, the output shaft turns morethan one revolution. This is the 'over' part. So the car goes faster for the same engine speed, or, put another way, the engine turns slower for the same vehicle speed. Since most engines produce peak horsepower at a fairly high RPM, and the overdrive slows the engine down, there is actually less horsepower (and torque) available at the wheels while the overdrive is engaged. This is why most manufactuters recommend not using the overdrive when towing heavy loads.
No it turns itself on