How to Clean a Throttle Body: Making Things Run Smoother
Cleaning your vehicle’s throttle body regularly can help improve its drivability and performance.

John Hsu - Writer
MotorTrend Staff - Photographer
Manufacturer - Photographer

Jul 23, 2024



The throttle body controls airflow into an engine. For fuel-injected engines it’s usually housed between the air filter and intake manifold. Keeping this component clean can help your vehicle deliver noticeably smoother performance.

A dirty, grimy, or clogged throttle body can lead to rough idling, poor acceleration, and stalling. Cleaning the throttle body is a simple task that requires no specialized knowledge. You can do it in 10 to 15 minutes.

It's generally recommended that you perform this task every 30,000 miles. Unsteady idling, sluggish acceleration, and trouble shifting while driving are signs that it may be time to clean your throttle body.



Tools and Materials

The tools and materials you need for throttle body cleaning cost little to nothing. These include:
　　
Specialized throttle body spray should be available at your local auto parts supply store or the automotive section of a hardware store. You can also use a throttle body cleaner alternative, such as WD-40 or a carburetor cleaner.



Step 1: Locate and Disconnect the Throttle Body

Start by locating the throttle body under the hood. It's the component that’s normally located between the air cleaner and the intake manifold on fuel-injected cars.

If you're unable to identify the throttle body, ask someone to step on the gas pedal while the engine is off. This will cause the throttle shaft to shift noticeably, as it's connected to the accelerator.

After you've located the throttle body, disconnect the battery as a safety precaution and ensure you've turned the engine off.

Remove any hoses and ducts connected to the throttle body. You could label them with masking tape first so that you know which hose to connect to each coupling when you reattach them later.

To remove the air intake tube, use a Phillips or Torx screwdriver to loosen the hose clamp. Gently twist and pull the duct until it comes off. Be careful not to disconnect any electrical wires or terminals in the process.

Sometimes, the throttle body has two air intake tubes, one on each side. In this case, you only need to remove one of them to expose the throttle for cleaning.

Step 2: Spray Cleaning Solution

Put on your rubber gloves and eye protection before applying the cleaning solution to the throttle body. This will protect you from the hazardous chemicals in the cleaner.

It's fine to spray the cleaner onto the butterfly valve with the assembly in place. It won't cause debris to fall into the engine as long as you don't overdo it. You need to clean both sides of the valve. If your vehicle has a cable-driven throttle, you can open the valve by hand.

Things get a little trickier with a drive-by-wire throttle body. You can't open the valve by hand, as it can damage the system. Instead, depress the throttle pedal. You can do this by placing something heavy on the gas pedal to keep the valve open or asking someone to step on the pedal.

After applying the cleaner, let it soak for about 10 minutes before cleaning the throttle body.



Step 3: Scrub Away Debris

Follow this guide on how to clean the throttle body without removing it:

1. Gently scrub the inside of the throttle body with a toothbrush to loosen any dirt, varnish, or gum. This is also an effective way to get into hard-to-reach crevices.

2. Use a rag or paper towel to wipe up the residue. If you see any remaining buildup, continue to spray the cleaner, scrub, and wipe until the metal is clean and bare.

3. Be careful to avoid getting cleaner on the sensors during the cleaning process and clean up any liquid or residue that may have spilled onto any of the surrounding components, such as the engine.

4. When you've finished cleaning, lightly lubricate the throttle shaft to ensure smooth movement. Use a cotton swab to apply a small drop of general-purpose oil at the points where the shaft enters the throttle body.



Step 4: Clean the Mass Airflow Sensor (Optional)

The MAF sensor ensures proper airflow into the engine. It can help your vehicle run more smoothly and deliver better gas mileage.

Here's how to clean the throttle body sensor:

1. Locate the MAF sensor. This is a small black square box between the throttle body and the air filter box. Use a Phillips screwdriver to remove each of the screws securing the sensor to your car.

2. Hold the straw of the MAF cleaner around 4 inches away from the silver wire or plate of the MAF sensor. Spray 10 to 15 times or as many as it takes to make the wire or plate sparkle.

3. Let the cleaner air-dry for one hour and reinstall the MAF sensor.



Step 5: Reassemble and Test

Use the labels you made earlier to correctly reconnect the hoses and ducts to the throttle body. Double-check all connections and tighten each clamp securely.

After you've put everything back in place, start the engine and let it idle for several minutes. Then, take your car for a test drive to see if there's any difference in its drivability and performance.



Tips for Best Results

Follow these tips to get the best results from throttle body cleaning:
　　


Boost Your Car's Performance With Throttle Body Cleaning

Knowing how to clean the throttle body is a useful skill that can benefit your vehicle. This easy DIY job is a great preventative maintenance measure that can immediately improve your car's drivability and efficiency. Consider making throttle body cleaning a part of your routine vehicle maintenance.

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