Throttle Body Manufacturer

Together with other auto parts in the fuel injection system, a throttle body is a part of the air intake system that governs the amount of air regulating in the engine connected to the driver accelerator and input.

The amount of air present decides the amount of pressure applied needed by the driver to put in the accelerator pedal. When processed carefully, air and fuel mixture is supplied in a balanced way allowing your engine to run smoothly and more efficiently.

Tangxia Industrial Zone, Ruian, Zhejiang, China 325200

MZW Automotive throttle body suppliers ensure that the radiator is in perfect working condition before selling it to you.

Founded in 1995, MZW is a brand known to supply honest and reliable auto parts aftermarkets for virtually every motor vehicle brands and models. We offer the best auto parts alternatives such as starter motor, brake parts, suspension and steering, cooling products, fuel systems, and more.

MZW Motor is inline with the best throttle body suppliers in the market. Our products are produced under the strict supervision of our employed engineers and professionals to keep quality that conforms to the highest standard established.

Why MZW Throttle Body?

When having a bad fuel injection that is caused by a failing throttle body, MZW is a brand to trust. We manufacture throttle body replacements not only to give consumers a simple alternative but also to deliver an upgrade to the overall performance of the vehicle. Our throttle body is designed with flawless functionality that eliminates typical failures from original equipment.


  • Desired product by many aftermarket businesses from many regions due to low-cost, yet effective replacement
  • Durably constructed using high-strength materials translates to longer service life
  • Tested using high-tech components for a more precise product
  • ISO certified
  • Expected to perform in not the same, better than advertised and better than OE

We guarantee you every MZW Throttle Body has passed a series of strict tests:






MZW Made Throttle Body

Don’t compromise your vehicle’s overall performance with a cheap throttle body offered by some random shops online. MZW offers the best aftermarket throttle body at a competitive price with functions and performs the same or better than many factory unit brands today.

All-in-One Solution

Alongside our throttle body, MZW has a comprehensive selection of aftermarkets. This makes us your ideal partner when it comes to auto parts replacements.

Customer Service

We offer exceptional customer service. Our team of experts is always ready to answer every concern you have. We can help you make the right purchase if you are confused what to get.

Reliable Aftermarkets

Units we offer are being utilized not only in China but also in many neighboring countries. MZW Motor provides auto parts that will not disappoint.

Throttle Body Cross Reference Lookup

Find the right throttle body by entering the OEM number or cross reference number.

We are currently updating our throttle body cross reference/OEM number database, will improve the throttle body Search Function Soon.

Please send us your list and we will do the search for you manually.

About MZW Motor

In par with the best throttle body brands, MZW ensures to produce only top-tier replacement to live-up to our partner’s expectations. Combing both worlds of affordability and quality, our alternatives will give you the benefit of getting OE-like throttle body performance that will not break your bank.

With our rich, two decades of manufacturing expertise, MZW makes sure that every order is received in their pristine, complete condition. All products are enveloped with a transit tested packaging for safer and secure product transport.


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Tangxia Industrial Zone, Ruian, Zhejiang, China 325200

MZW Throttle Body Guide

throttle body assembly The throttle body is a simple regulating device used in automotive fuel injection systems. It’s also easy to access under the hood. But despite that, many people do not know what throttle body is or even where to find it. Not to worry. In this guide, you will learn about the throttle body meaning, its location in a vehicle, and how it functions. Also included in the guide is a section to answer popular questions such as throttle body price, replacement cost, and repair options.

Throttle Body Definition: What is Throttle body on a Car?

The throttle body on a car is the device that “throttles” (regulates) engine intake airflow. The basic throttle body design is an assembly consisting of a short tube with a valve to close and open it. Differences in the device mainly occur in the type of individual components and actuator mechanism. Most throttle bodies use a type of valve called butterfly valve. A throttle body butterfly valve comprises a round metal plate that rotates on a shaft. Although rare, there are throttle bodies that use barrel or slide valves instead of the butterfly type. The throttle body location also varies across vehicles, but only slightly. Since the device regulates engine intake air, you will always find it between the intake filter and the engine intake manifold. In most vehicles, the throttle body assembly is bolted to the engine intake manifold. There are two types of the automotive throttle body; mechanical and electronic. A mechanical throttle body uses a cable to operate the valve. The cable pulls at a spring loaded arm on the device to open the valve while a spring helps to keep the valve closed. The electronic throttle body contains no cable. Instead, it uses a small electric motor to operate the valve. The working of the motor is, in turn, governed by the ECU or Engine Control Unit. The ECU issues commands based on the position of the gas pedal and engine power requirements. Throttle bodies are different sizes, depending on the type of engine. Throttle body size is expressed in mm and is a measure of the assembly’s inner bore. Sizes vary from 65mm all the way up to 90mm for the throttles of most engines. A majority of stock throttles measure between 65mm and 70 mm. For forced induction and high boost engines, the throttle body size can be up to 90mm and higher. mechanical throttle body carburetor

Throttle Body vs. Carburetor

A throttle body and carburetor differ both in design and function. The throttle body assembly is just a tube and valve to control air passage. In contrast, the carburetor is more than an air regulating device. It’s a complex assembly of channels and valves that also meter fuel to achieve the required air-fuel mixture. A throttle body also only regulates air, while a carburetor regulates both air and fuel. In the modern car, the throttle body contains sensors that communicate with the ECU to determine the best operation based on engine requirements. Vehicles that use carburetors do not need a throttle body. The carburetor itself contains a throttle plate which functions like a throttle body and controls the amount of air available to mix with fuel. Both devices, whether throttle body or carburetor, perform one main function, which is to control engine power when driving.

Throttle Body Function: How does a Throttle Body Work?

The throttle body regulates the amount air available to mix air in a fuel injection engine system. It’s, therefore, responsible for situations such as acceleration, engine idle speed, and starting. Because vehicle horsepower depends on the volume of air reaching the engine, the device controls the engine power output. Here is how a throttle body works to regulate engine operation. To accelerate, a driver steps on the gas pedal. As the pedal moves down, the throttle body valve opens, the extent of which depends on how far down the pedal goes. The opening valve lets more air through. More air means more fuel in the mixture combusting in the engine cylinders; and more horsepower. The throttle body working mechanism describes is a simple representation of what happens when you press the accelerator pedal. A lot more happens, and the mechanism depends on whether you have a mechanical or electronic throttle body. If you have a MTB, stepping the gas pedal tensions the throttle cable. This cable is connected to an arm on the valve’s shaft. When under tension, it pulls the arm to open the valve when. When it slackens, a spring on the arm pulls the valve’s plate back to its closed state. In an ETB, stepping on the gas pedal causes the pedal position sensor to send a signal to the ECU. The ECU then calculates how far the throttle body valve should open and sends the commands to the small motor on the throttle body. The motor spins and, through a set of reduction gears, rotates a shaft to open the valve. Sensors on the throttle body assembly continually detect the pressure and temperature of the air passing through the device. This information is used by the engine control module to determine the correct fuel air mixture. There is also the throttle position sensor to detect the valve plate angle whose signals the ECU uses to calculate the amount of fuel needed. parts of throttle body

Throttle Body Parts

The components of a throttle body assembly are different for the different types of the device. However, the general design does not vary which a pipe consisting of a butterfly valve or any other closing mechanism. Here is the throttle body parts list for the main components.
  • Throttle Body Housing- the housing encloses all the other parts, with openings and channels necessary for the device’s operation and installation. It’s usually made from cast aluminum, which makes it resistant to rust for a longer lifespan.
  • Throttle Body Valve- the valve is the part that opens and closes to regulate the flow of air as it goes into the engine. Most throttle bodies use a butterfly valve. The working of throttle body butterfly valve is supported by several other parts; the plate, shaft, and spring.
The throttle body plate is a circular component that opens and closes the valve. It spins on a shaft that runs across the opening. The spring tensions the plate and returns it to former position when the gas pedal is released.
  • Throttle Body Position Sensor- a typical throttle body uses two main sensors, the throttle body position sensor, TPS, and the manifold absolute pressure or MAP sensor. The TPS sensor detects the valve plate angle, while the MAP sensor records the amount of air flowing through the valve.
  • Throttle Body Actuator Motor- This is the small motor found in the electronic type of the device. It provides the force to open and close the valve, and operates from the inputs of the throttle body module. The module, in turn receives commands from the main ECU or engine control unit. A set of reduction gears multiplies the rotational force of the motor.
  • Throttle Body Connector- this is that part where the throttle body wire harness attaches. It provides the pathway to deliver power to the electronic components of the device. The connector also contains the wires that communicate signals between the ECM and the sensors.
  • Throttle Body Lever- the lever is only found in mechanical throttles. As the name indicates, it reduces the effort required to operate the valve. This improves the response time. The lever connects to the cable and moves when you step on the gas pedal to rotate the valve plate.
  • Other Parts- other minor but important parts include the idle air control valve, gasket and, in some versions of the device, injectors. The idle control valve provides a pathway for air to bypass the main valve when the engine is in idle in some types of the throttle body.
Also called throttle body O ring, the throttle body gasket seals the assembly when you mount it. In some systems, you will also find fuel injectors as part of the assembly. A throttle body injector is no different from those used in the engine intake, only the position has changed. carbon build-up

Throttle Body Problems

A throttle body rarely goes bad. Nonetheless, it does eventually to the extent of requiring service or replacing. When it does finally goes bad, you will easily know since signs appear as engine performance issues. Before we can look at the symptoms, let’s first see what causes the device to go bad. Reasons for throttle body failure include the following.

Worn or Corroded Parts

Over time, a throttle body’s moving parts wear down or give in to corrosion. This results in the valve not opening or closing properly. Wear often happens in the gears and motor parts of an electronic throttle, while corrosion mostly affects the metal surfaces. The throttle body connector pins can also corrode. Worn parts can only be replaced, either through a throttle body rebuild or by installing a new assembly altogether. Corrosion can be removed by cleaning up the affected parts. However, that depends on the severity of the problem. Most of the time, replacement is the only option.


Clogging results from a buildup of debris and carbon deposits over a long period. This often leads to issues such as sticky throttle body parts and valve problems. When dirt covers most of the valve parts, it interrupts the smooth flow of air and affects the atomization of the fuel mixture. Dirt buildup can also affect the sensors, causing them to send incorrect signals or to stop functioning.. Throttle body cleaning to remove build-up usually solves clogging problems. However, you should only use the type of cleaner meant for throttle body assemblies. Using the multipurpose types of cleaners may not produce the expected results. You cannot mistake the cleaner for throttle body since it’s always labeled

Sensor Damage

Besides the throttle body itself getting damaged, sensor malfunction can bring about issues. The working of the device is controlled by different sensors such as MAP and TPS. If faulty, the throttling operation is affected. This leads to throttle body symptoms. Sensor issues can be corrected in various ways. If the fault is caused by dirt buildup, cleaning the sensor restores its function. Throttle body sensor adjustment, too, fixes looseness problems. Sensor cleaning and adjustment are usually the first options before considering more drastic steps such as replacement.

Vacuum Leak

The gasket for the throttle body serves to ensure a leak-free installation. With time, though, the gasket may break down and leak air. Throttle body gasket leak is one of the problems that cause noticeable problems. It leads to inadequate air in the engine, even with the valve open. A leaking gasket can be replaced. The part is usually sold individually and is one of the components that get changed when servicing the throttle. Besides fixing throttle body leak, installing a new gasket ensures throttle air remains protected from engine heat.

Electrical Faults

These result from loose, worn, broken, or corroded connectors. Bad ground, too. The electronic parts of the throttle assembly must receive adequate power and the sensors should have good connections. Problems cause the motor to malfunction and the sensors to send incorrect signals or none at all. Electrical faults usually require replacing the bad part. A throttle body connector is sold individually, for example. The motor, too, can be purchased as an independent part to replace a burnt one. However, severe problems with the electrical parts of the device should be corrected by installing a new one.

Sticking throttle cable

This problem affects mechanical throttle bodies. The cable sticks due to dirt and wear or lack of lubrication, which usually happens when it has been used for a long time. When the cable binds, the opening and closing of the throttle valve become unpredictable. A sticking cable can be repaired by cleaning or lubricating it. If severely worn or frayed, it needs replacing. If left in place, you risk losing acceleration when you need it. Response time would also be affected, among other issues.

Bad Throttle Body Symptoms

A bad throttle body causes many noticeable symptoms. The engine may lose performance dramatically or behave erratically. It may even stall during idle, when starting, or while running. If the throttle body valve or sensor is not working properly, you may experience a drop in throttle performance or lose it completely. Common throttle body symptoms include the following
  • High or low engine idle speed that leads to stalling or overconsumption of fuel
  • Rough engine idle
  • Poor acceleration
  • Erratic acceleration or acceleration that happens unexpectedly
  • The car using too much fuel than usual
  • Dashboard light coming onto indicate engine malfunction
  • A reduction of engine power due to inadequate air or incorrect sensor signals
  • Odd throttle body noise such as whistling often caused by vacuum leaks
throttle bodies different designs

Throttle Body FAQs

Q1. How many throttle bodies does a car have? A. Many cars use a single throttle body. There are also those that use more than one throttle. Although rare, you will find vehicles that have a throttle for each line of cylinders. Some even use a throttle body for each cylinder. These are usually large automobiles or performance vehicles. More throttle bodies mean faster response when you step on the gas pedal, among other benefits. Q2. What is a throttle body spacer? A. it’s a small, round piece of metal part that people install between a throttle body assembly and the mounting surface. Proponents of the part argue that it improves performance by improving the flow of air through the throttle and into the intake manifold. While that is not documented, the throttle body spacer continues to be a popular modification component with many car owners. It’s also purely aftermarket, which means auto makers do not install it in their vehicles. Q3. Does throttle body size matter? A. It does. Size affects the amount of air that the device makes available to the engine. That means the wrong size will have a negative impact on the engine. Stock throttle bodies are usually perfectly sized. But if you just modified your engine, you may also need to change the throttle using an aftermarket model. The current one could be over-restricting airflow and causing the engine to underperform. A “too large” throttle would also affect engine performance and increase emission, especially if the exhaust cannot cope. Q4. How long does a throttle body last? A. throttle bodies usually to not get damaged easily and can last a long time. Most of the time, they only get clogged, which also takes a long time to become a noticeable problem. Cleaning the assembly at 7500 miles minimum adds more years of service life. The life of throttle bodies also results from the many replaceable parts it contains. Most of the time, faults are corrected by changing the bad component. Q5. What is throttle body cleaning and how does it help? A. Throttle body cleaning involves removing dirt buildup to restore efficiency. Throttle bodies get dirty with time, especially from the accumulation of carbon deposits. Dirt affects the assembly in many ways such as interrupting airflow or causing parts to stick together. Cleaning also involves the sensors, which also become faulty when covered with dirt. If you choose to do the cleaning yourself, ensure that you have the right throttle body cleaner with you. Ensure, too, that you use the correct procedure. That is because doing it wrongly risks damaging some parts of the assembly or not removing everything. This short video shows how to clean an electronic throttle body. Q6. Can you drive with a bad throttle body? A. you could but the performance of the engine would be erratic or unpredictable. In severe cases, you may lose control of the engine output, which could be dangerous when on the road. A badly damaged or dirty throttle could even cause the engine to stall. You do not want that to happen when you are out on the road. In a nutshell, you should consider seeking throttle body service or replacing as soon as you notice signs of failure. Q7. Can you repair a throttle body? A. You can. Throttle body repair involves doing things that restore the device’s functioning and operation. These involve cleaning the entire assembly, including the sensors, and replacing the damaged parts. The cost when you go the DIY way is lower. You only need a throttle body repair kit which costs around$50 average. At a throttle body repair shop, you may need to spend around $100 as service charges. Nevertheless, that would still be cheaper than installing a new assembly, especially if the problem is fixable. Q8. When should you consider a throttle body replacement? A. Throttle bodies require replacing when faulty and cannot be repaired. Such situations include an excessive buildup of dirt, worn parts such as the valve components, motor, and gears. Besides throttle body issues, you many need to replace the existing assembly if you modify your engine. A more powerful engine requires a larger amount of air- and a larger throttle. Q9. How much is the throttle body price? A. The throttle body cost varies greatly and starts from around $50 to several hundred dollars. The highest-priced models can even be as high as $100. The price depends on several factors such as brand, design, and the type of parts and features available. That also means a mechanical throttle body will cost a different amount from the electronic type. When buying a throttle body, it’s essential to ensure the model and type of the device is compatible with your car’s engine. Q10. What is the throttle body replacement cost? A. The cost for throttle body replacement varies but you can expect to spend between $100 and $200. The amount depends on your type of vehicle or the charges of the particular repair shop. Adding the price for throttle body, the total cost could amount to $150 for the most inexpensive model to as high as a few hundred dollars or more. There are car owners who choose to replace their throttle bodies. While that lowers the costs considerably, you should only consider doing so if you know how to replace a throttle body without difficulty.


The throttle body on your car is one of the components that the engine depends on to run properly. As such, you should routinely service it. A bad throttle body causes all sorts of concerns, from starting issues to acceleration and idle speed problems. To correct them, you may need to have the device cleaned or rebuilt. You could also choose to replace it depending on the situation. All these things need you to have adequate information about throttle bodies. We hope this guide helps you make important decisions regarding the car part.

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