Throttle Body

Air plays a vital role in enabling fuel combustion in your engine. And making sure your engine receives the right amount of air needed for combustion is your vehicle's throttle body. Now, this component is essentially comprised of a housing with an air valve inside. Like the rest of the valves in your car, the air valve is what controls airflow into your engine via its intake manifold. Depending on your vehicle's design, this particular valve will either be employed in MFI throttle bodies or TBI systems. MFI throttle bodies are basically used in multi-point fuel injection systems to regulate airflow. While in TBI systems or throttle body injection systems, this valve is also where fuel is shot through to make its way into the engine cylinders. In most engines, throttle bodies also come with the IAC (Idle Air Control) valve. This secondary circuit is what your vehicle uses to regulate airflow when your vehicle is idling. With a working IAC valve, stalling during idling is easily prevented. Aside from having slightly varying functions, throttle bodies can also differ according to their designs. Some of the predominant designs used today include butterfly valves, pinch valves, and barrel-type valves. To find out which type of throttle body your car uses, we recommend checking your owner's manual.

All show, no go. That's how your fuel-injected car would act once its throttle body conks out. On most cars, the throttle is mechanical. A mechanical throttle uses a cable to make the throttle linkages move the throttle plate.The plate's position determines how much air flows into your car's engine. There are electronic throttles as well. Electronic throttle systems are controlled by the engine control unit (ECU), eliminating the use for a throttle cable. The ECU sets the throttle plate's position according to information sent by different sensors (such as the engine speed sensor and the accelerator pedal position sensor).Both types of throttle bodies, however, become prone to failure as time passes. Once the throttle fails, your car may idle or accelerate roughly. It may not even start up properly at all. Simply put, throttle failure can paralyze your car. The throttle body may become defective due to corrosion, leading to stuck parts or burnt-out sensors.If you want to keep your car moving, make sure it has a fully functioning throttle. Auto Parts Deal has just the right stuff to help you with that.


• Vital to the air intake system on fuel-injected cars

• Highly resistant to corrosion

• Has durable valves and linkages that last longer than stock

For your car to have a proper intake of air, a good throttle body must be installed properly. The throttle body is the one that controls the amount of air entering your engine's combustion chamber. To help you out, here are the steps on getting the throttle body properly in place:

Required skill level: Intermediate

Required tools and materials:

• 0.25-inch sockets
• 0.25-inch ratchet
• Wrench set
• Screwdriver set

Removing the hat

The first thing to go would be the throttle body hat (or simply, the hood). If your vehicle has an aftermarket air intake installed, it would be easier for you. If not, you would just need to remove the flex hose first before the throttle hat.

Disconnecting the throttle

After removing the hood, you would see three electronic connections attached to the throttle body: one in the rear and two on the driver side. To remove the two on the side, simply push down on the tab and pull them off. For the other one, you would need to slightly lift the tab to be able to take it off. Next, remove the vacuum line found in front of the throttle body.

After getting the electric connections out, it's time to focus on the throttle cables. There are also three throttle cables in the assembly - all of which have a C-shaped end connecting them to the throttle. Do not pry them off. To remove them, you need push out the cables toward the opposite direction it is being pushed in. Remember to push the cables past the stud to get it out.

Removing the body

You need to remove the bolts holding the throttle cable attachment brace to the body (there are two in front and one behind the spring on the side). The brace is still attached to the cables so do not move it very far.

Now, you need to remove the four bolts on top of the throttle body. After taking them off, you should be able to lift the body off. Remember to cover the opening after removing the body to make sure that nothing falls in it.

Installing the throttle body

Remove all the sensors (the idle motor, the throttle position sensor, and the MAP sensor) from the old throttle body and install them on the new part. You can now place the new body in place, replacing all the bolts you removed before.

After putting back all the bolts and cables, you would just need to disconnect the negative side of the battery for about 10 to 20 seconds. Reconnecting it after allows the computer to reset and learn the setting with the new air flow rates.