8 Symptoms of a Bad Throttle Body (& Replacement Cost)

The throttle body controls the amount of air entering the engine.

Here’s how to check for a bad throttle body. The throttle body is an important mechanical component found in fuel-injected vehicles that control and regulates the amount of air flowing into the engine. The best way to diagnose if your vehicle’s throttle body is in its appropriate condition is by using a test procedure. However, a flawed combustion process will not occur properly if the throttle body is damaged by an improper mixture of air and fuel.

In this article, we will discuss the common symptoms of a bad throttle body, the location, and the replacement cost. I’ll start with the signs to look for.

Bad Throttle Body
Bad Throttle Body

8 Bad Throttle Body Symptoms

Check Engine Light

The throttle body has some angle sensors and other sensors installed in it. As soon as the car’s onboard computer detects a problem with the throttle body signal, the check engine light illuminates. The check engine light also comes on due to several other reasons, which is why you should have the car scanned for any trouble codes when it pops up on your dash.

Rough Idling

If you notice your car’s engine is idling a lot and it makes odd noises, it could be because the throttle body is dirty or damaged.

The car engine is most sensitive when idling, where you’ll notice symptoms first. They’ll be dirtier or worse in the throttle body.

Rough Acceleration

The throttle body regulates the air-fuel mixture that is entering the engine. If a car’s throttle body is faulty, it may be causing problems when accelerating.

There are a number of possible causes of a bad throttle body and if your acceleration is uneven then it’s very likely that you will need to replace the throttle body.


Misfires often occur either when the air-fuel mixture is too rich or when it comes to a weak spark from the spark plug.

We’ve seen this before. It is a simple matter of incomplete combustion. A bad throttle body can cause the fuel-air mixture to get out of balance, and it can also cause your engine to misfire.

Over-revving the engine is the easiest way to detect a misfire.

High RPM Idle

The idle air control system opens or closes the throttle body to adjust the idle speed.

The engine may need to have its throttle body changed if there’s a problem with the throttle body. A not calibrated throttle body can also cause this. You can calibrate the throttle body with most diagnostic scanners.

Stalling Idle

A throttle body can affect your engine speed in either direction, or the RPM can affect the throttle body.

The RPM should not drop to the point where it can cause the engine to die. This is often caused when there’s a large amount of soot and dirt on the throttle body flap, which will cause less air entering the engine and therefore cause lower idle RPM. A throttle body cleaning and a throttle body calibration with a diagnostic tool usually solve this problem.

Poor Engine Performance

The engine needs both adequate air and fuel supply to perform effectively.

If your engine isn’t getting enough air from your air intake system, the engine will suffer, and if left uncorrected, the driver could feel a drop in performance. If your car feels like it lost half of its power when accelerating, it can definitely be caused by a bad throttle body.

Changed Fuel Consumption

It’s time to do some engine repairs. You have to replace the carburetor, fuel pump, air filter, and throttle body.

This can cause a bad throttle body, so be sure to do the maintenance at regular intervals to maintain your vehicle’s performance.

Refueling your car less frequently might sound like a good thing, but your engine doesn’t think the same in the long run.

What Is a Throttle Body?

The throttle body of your vehicle is a butterfly valve, and it’s a fairly simple device.

The throttle body’s primary function is to regulate and control the amount of air allowed into the engine.

The input data is sensed from the driver’s pressure on the accelerator pedal of the vehicle. The air flowing into the internal combustion engine at this time would cause a drop in pressure, which will affect the speed of the engine and its output torque, thus making the car unable to accelerate as fast as Most vehicles have one throttle body. It’s usually found at the base of the carburetor on the intake manifold.

The throttle body also depends on other parts, such as the air filter.

Cleaning the Throttle Body

Even if you’ve got a good air filter on your car, dirt and soot come from the turbocharger, EGR valve, and crankcase ventilation and get stuck on the throttle body valve. After the engine has run for a while, it will cover the valve enough that the RPM will be affected.

Dirt in the throttle body will cause many problems. This will prevent the engine from running smoothly, so it is often possible to clean it out. To find out more about cleaning the throttle body, you can check out our Throttle body cleaning guide.

Remember to recalculate the throttle body after you do this repair. Though.

Throttle Body Location

Throttle bodies are found at the intake manifolds of vehicles and are usually attached to the intake manifold. Aluminum is the material that throttle bodies are made from.

The throttle body’s location can vary, but it can also vary for different vehicles. However, according to its purpose, the throttle body should be placed between the air filter and the intake manifold.

Throttle Body Replacement Cost

The cost to replace the average throttle body is between $250 and $650, depending on the car model and labor costs. The average throttle body cost is between $200 and $500, while the labor cost is between $50 and $150.

The throttle body can be differently priced depending on different vehicle models, models, and the manufacturing company. Q: How to run a program in the background? I’m using ubuntu 10. It is important to know how much it will cost to replace a throttle body, as it will influence your decision to replace it.

Regular maintenance can help prolong the life of the throttle body’s parts and you may not need a replacement for a while. The labor cost associated with the replacement of your car is an economic issue, depending on which mechanic you will choose to repair your automobile.

Make sure you take a new scan of the throttle body valve before replacing it, and then make the appropriate adjustment with your diagnostic scanner.

Throttle body FAQs

Can I replace the throttle body myself?

Replacing the throttle body is sometimes easy. It’s usually straightforward in most cars if you understand how it works. For some vehicle models, however, it is necessary to reset/calibrate the throttle body with a diagnostic scanner after the replacement, which most people don’t have at home.

Does cleaning the throttle body make a difference?

Cleaning the throttle body can make a difference, but it depends on how dirty it is. Throttle bodies get dirty over time. You might have to do a bit of cleaning or rebuilding to restore them to their best performance.

When your car is dirty, you need to work harder and it won’t work as well. If your throttle body is dirty, cleaning it could make a noticeable difference in your car’s performance.

Can you drive with throttle body problems?

It depends on how serious the throttle body problems are. If the throttle body isn’t working correctly, your car won’t be able to move very well. If there is a problem with the throttle body, the car will usually not start.

How do you reset a throttle body?

There are a number of different ways to reset a throttle body, depending on the make and model of your vehicle. Some models may require the battery to be disconnected from the charger for a period of time so the system can reset and for others, you’ll need a diagnostic tool to learn the settings. See if there’s a repair manual for your specific car model.


What is a throttle body?

A throttle body is the part of the engine that controls the amount of air that enters the engine.

Why does my car have a bad throttle body?

The throttle body may be damaged, worn out, or clogged with dirt and debris.

What can I do to fix a bad throttle body?

You will need to replace the throttle body. It will cost around 50$ – 150$

What are the symptoms of a bad throttle body?

The symptoms of a bad throttle body include a rough idle and low power. The throttle body is an important component of the engine. It controls the airflow into the engine and it is the most common cause of engine failure.

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