throttle body

The throttle body is the device that allows air into the engine. Basically it's a butterfly inside a bore that opens as you push on the accelerator pedal. When it's fully shut, it still allows the minimum amount of air (known as minimum idle air) into the engine to keep it from dying. Throttle bodies can also incorporate EGR functions.

-Bruce

No throttle body info here but good sites nonetheless:

you can get to a library, check out some auto repair manuals,like Motors, etc. and read them. Auto "mechanics" is a never endinglearning process.

Thanks for the info Ill check out those sites...

Try here.. See the technical articles

Go here

The throttle body simply meters the amount of air entering the engine, a throttle position sensor is attached to the throttle plate shaft and measures throttle opening by using a 5volt reference signal from the ECM and varying the output from less than 1volt to 5volts depending on throttle opening. So at idle the output voltage back to the ECM will be low, at 1/2 throttle the output voltage back to the ECM will be roughly 2.5volts and at W.O.T. or wide fukin open the output voltage back to the ECM will be 5volts. Fuel injection is not that complicated once you understand the fundamentals, It uses various sensors such as throttle position, manifold pressure (vacuum), water temperature, air temperature, RPM, knock sensor and a timing sensor. Early systems used a M.A.F. (mass air flow) sensor to determine how much air was entering the engine, the most notorious of these types used a tungsten wire that was heated to a specific temperature, as air entered the sensor and attempted to cool the wire the ECM would increase the voltage and this difference in current flow was how the ECM determined air flow. (pretty basic huh) ROFL

-- Mad Dog