Problems After Cleaning Throttle Body And How To Fix

A throttle body is an essential part of an automobile engine. It is utilized to get air into the engine for operational purposes.

This item can fail for various reasons, and one of the issues might occur after cleaning throttle.

So, what are the problems after cleaning throttle body, and how to fix them? If you are interested in this, keep scrolling down to find out more!

What Does The Throttle Body Mean and How Does It Work?

problems after cleaning throttle body
Throttle Body Mean and How Does It Operate


The throttle body is a pipe with a horizontal shaft and a valve. It is used to regulate the quantity of air that enters the engine.

The throttle body has two sensors – the volume control sensor and the mass airflow sensor, which are meant to give data to a controller.

Depending on that data, a specified amount of gasoline is delivered to the engine’s injectors.

How It Works

The throttle body is usually placed between the intake manifold and the air filter and comprises a sensitive throttle mechanism that regulates a vital element of fuel combustion: airflow.

The airflow, which is fundamental to the atomization process, helps maintain the air-fuel mix proportions required to start the engine.

A throttle body temperature sensor, which detects the temperature of air combination encountering your engine’s fuel injection system, is the primary control for throttle pressure.

This critical adjustment ensures that spark ignition produces the best fuel economy.

Airflow is completely dominated by a butterfly valve called the throttle plate and is managed by the driver by pushing the accelerator/gas pedal from inside the car.

This reacts to a sensor gauge on the throttle bottle, indicating that it permits extra air to reach the combustion chamber, boosting RPM and horsepower output. As a result, the automobile accelerates.

What Are The Problems After Cleaning Throttle Body?

rough idle after cleaning throttle body
What Happen After Cleaning Throttle Body

Does cleaning throttle body make a difference? Some problems can arise with the throttle body, such as:

  • Rough Idle 
  • Dirt buildup
  • Poor fuel efficiency
  • An illuminated check engine light
  • Electrical Issues
  • Power Deficiency
  • Car stalling or jerking

The most common case is rough idling, but sometimes, you will spot other accompanying signs, which will be described below:

Rough or High Idle – The Most Prevalent Issue

Can a dirty throttle body cause rough idle? Yes, dust in the throttle body disrupts airflow, resulting in an imbalanced idle speed.

Rough idle is the most typical sign of your throttle body not functioning well. You will notice the rough idle after cleaning throttle body when accelerating swiftly or stopping at a stop sign.

There are a few possible causes of high idle after cleaning throttle body with some corresponding remedies. First, ensure that all suction hoses are securely attached and are not leaking.

If the hoses are in excellent condition, inspect the throttle body for buildup or debris that might be triggering the issue.

Lastly, the idle control valve may be jammed open when your throttle body is tidy and the hoses are in an excellent state.

This valve regulates the quantity of air reaching the motor at idle. Therefore, once it becomes stuck open, it might result in shaking idling.

Should you believe the idling control valve is malfunctioning, get it examined by a professional.

Dirt Build-up

One of the most typical difficulties after throttle body cleaning is dirt buildup, which reduces its effectiveness and, consequently, the engine’s performance.

Keep in mind there might be carbon residue depositing within the throttle body, so keep that in mind while cleaning it.

Poor Fuel Efficiency

After cleaning the system, the car’s throttle body may be blocked if the average mileage per gallon declines by 10 to 15%. In this case, you will have to pay additional expenses for petrol.

An Illuminated Check Engine Light

A malfunction with the throttle position detector might explain why your check engine remains illuminated after washing the throttle body.

This sensor informs the computer how much to open or shut the throttle; if it fails, the car starts to slow down, and the check engine turns on.

Another alternative is that the idle air control (IAC) valve is malfunctioning, 

Moreover, if the car is idling very slowly, there might be a vacuum leak.

Electrical Issues

When washing the throttle body, check sure all internal sensors are dirt-free. The throttle body sensor will misread the signal and convey false information if it is clogged with dirt.

Once an electrical fault occurs, the vehicle changes to a lower-capacity mode, leading to a poor power supply.

Power Deficiency

After the throttle body is broken, it will create greater or lesser air in the motor. Cars experience minor acceleration issues as a result of this.

Pushing the gas pedal, you will anticipate the throttle body to pump more air in to spark the entering fuel. If the throttle body is defective, there would not be enough air to ignite, leading to a lack of power.

Car Stalling, Jerking Or Misfire

Can a dirty throttle body cause stalling? Yes, and one explanation is that you did not thoroughly clean the throttle body. These symptoms may occur if there remains dirt on the component.

Properly read the manufacturer’s directions when you clean the main parts and all the nooks and crannies.

Another scenario is that when cleaning, you damaged the throttle body. These indications might occur if you accidentally scrape or break the item in any manner.

So, be careful and minimize using abrasive tools or scrubbing too aggressively.

What Causes A Rough Idle After Cleaning The Throttle Body?

does a dirty throttle body affect performance
What Is The Reason Causes A Rough Idle After Throttle Body Cleaning

Since rough idle is the most common trouble after cleaning the throttle body, let’s inspect what will typically cause them:

Vacuum Leak

The airflow gauge precisely monitors the amount of oxygen that enters the engine through the throttle body.

A vacuum leak might develop when the throttle body admits more air into the machine, and the CPU compensates by supplying extra fuel.

When you let your vehicle on driving mode, it assists in relearning idling and enables the car to go down for roughly a couple of minutes with all accessories turned off.

Because of the additional air intake, the information will not equal the airflow detected by the ECU, causing the Check Engine light to illuminate.

Torn Intake Hose

The intake manifolds provide metered air to the combustion engine’s intake manifold. When they tear, it might end up with rough idling because the air passes via the throttle.

When debris reaches the intake manifold via holes or leaks, it entails various engine issues, including poor performance and stalling. It can enter the motor and do significant harm.

Computer Readjusting

Cleaning the throttle body causes the system to restart, which requires your car’s computer to readjust, resulting in greater fuel being fed to the system and an increase in idle speed.

How To Fix High Idle Problems After Cleaning The Throttle Body?

After locating the issues, how can you fix them?

  • Allow the computer time for relearning: You should be conscious that the delay will initially be large until the software rediscovers it. After the computer relearning idle mode, switch on your AC for three minutes with the fan on high.
  • Remove and clean the throttle body: Thoroughly cleaning the bore’s front and rear should resolve the issue.
  • Using a computer scan tool: It examines throttle valve movement and position to detect deterioration and suggest a replacement as needed to address serious idle issues.
  • Manually reset electronic throttle control: Switching on the motor and waiting three seconds. After that, push and release five times in five seconds.

Then, wait seven seconds before completely depressing the gas pedal and holding it for roughly 20 seconds, or until the check engine warning light flashes and remains illuminated.


Does A Dirty Throttle Body Affect Performance?

Yes. When the throttle valve is unclean, it impacts the vehicle’s smooth operation. Unexpected idling, jerky or slow acceleration, poor fuel efficiency, and stalling are all signs of a malfunction.

How Much Does It Take To Repair A Throttle Body?

Throttle body components generally range around $200 and $500, based on the vehicle. Labor charges for this repair are often inexpensive, so installing the item professionally may cost you $50 to $150.

What Does Cleaning The Throttle Body Do?

A clean throttle body means fewer debris and contaminants on the blades, which may enhance airflow and make the engine operate more smoothly. 

If your automobile begins to idle poorly, polishing the throttle body is unquestionably a good idea. It can also aid the car’s performance and fuel efficiency.

Can You Drive With A Faulty Throttle Body?

No, you shouldn’t, due to two factors.

The first is a matter of safety. When your throttle is malfunctioning, your car might not move as you wish. This considerably raises the risk of an accident, a major concern.

The latter worry is less crucial than safety, but it might impact your money account. This is because operating with a malfunctioning throttle body might lead to more engine damage.

Improper fuel and air ratios reduce your vehicle’s efficiency and economy and increase wear and tear.

These failures will wreak havoc on numerous components, followed by higher repair costs when you begin repairs.


Problems after cleaning throttle body can arise due to some reasons we have listed above. The clearest sign here is rough idling, so pay close attention to that.

Hopefully, this post has served you well with useful information. Thank you, and see you soon!

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