The purpose of the throttle body on a fuel-injected engine is to regulate the air charge into the cylinders through precise metering of the air intake. There is a throttle position sensor on the opposite side of the throttle linkage cable that is called a potentiometer. Its purpose is to send a voltage consistent with the throttle opening to the computer. The computer uses this input to follow the amount of load requested and regulate the injector on time and the ignition timing.
Remove the air cleaner and duct hose assembly using the common screwdriver. Disconnect the electrical connector on the mass air flow by pulling out the plug. Disconnect the intake air temperature sensor found in the air duct.
Disconnect the idle air control on the side of the throttle body by pulling the electrical connector out. Disconnect the throttle position sensor opposite the throttle cable levers.
Disconnect the throttle cables by turning the throttle lever on the throttle body all the way open by hand and then removing the now slackened cables from the throttle lever.
Remove the heated water hoses from the bottom of the throttle body if there are any (this is vehicle dependent). Use the needle nose pliers to remove the clamps by squeezing the clamps and pulling them off. Pull the hoses off. Not all vehicles have these, although there are a few that do.
Remove the four bolts running through the throttle body and into the intake manifold. Use appropriate ¼-inch drive socket and ratchet. Lift the throttle body off the intake manifold. Protect the metal gasket that is in between the throttle body and intake. This gasket must be reused. Install the new throttle body and components in reverse order of removal.
