How to Clean a Throttle Body

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The throttle body of a car is responsible for controlling the engine’s air intake. A well-kept throttle body means a smoother-running car engine overall—therefore, cleaning this part from time to time is essential. Luckily, you can easily handle this car maintenance in 10 to 15 minutes, without calling a mechanic. Read on, and we’ll show you how to clean a throttle body without even having to remove it from the car!

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Part 1
Part 1 of 3:

Preparing to Clean the Throttle Body

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  1. First and foremost, you’ll need plenty of space and fresh air to work. Once you’re parked in an open outdoor space, open up the hood of your car and look for the aluminum throttle body between the intake manifold and the air cleaner. [1]
    • If you’re unsure how to identify the throttle body, have someone press the car’s accelerator (while the engine is off). The throttle shaft will shift noticeably since it’s connected to the gas pedal.
  2. This is a safety precaution for your vehicle. Make sure the car is turned off, then find the negative terminal under the car’s hood—it should be on top of the battery with an attached cable. Loosen the nut on the negative terminal with a wrench, remove the negative connector cable and move it away from the battery. [2] [3]
    • The battery looks like a large block with two cables attached.
    • The negative terminal is black and marked by a “-” symbol.
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  3. Use masking tape to create tags for each hose and coupling that must be removed to reach the throttle body. You’ll need to know which hose connects with each coupling once you’re finished cleaning and need to reattach everything. [4] [5]
    • Alternatively, you can also use specifically-designed labeling tape to mark each duct.
  4. Since you’ll be working with chemicals under the hood of your car, it’s wise to use eye protection and rubber gloves for this job. [6] Make sure these are both on before you start washing out the throttle body with cleaner fluid .
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Part 2
Part 2 of 3:

Cleaning the Throttle Body

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  1. It’s usually held in place by a hose clamp, which you can loosen with a Torx or Phillips screwdriver (check the clamp to determine which one you’ll need). Gently twist and pull until you can safely detach the air duct, and be sure that you don’t disconnect any electrical wires in the process. [7]
    • Some cars may have air ducts attached to either side of the throttle body, but removing one of them should be enough to expose the throttle for maintenance.
    • In addition, some cars may have electrical wires attached to the throttle; take care not to detach any of those while you work.
    • If you’re unable to remove the air ducts yourself, stop what you’re doing and take your car to a trained mechanic for throttle cleaning.
  2. Spray throttle-body cleaner in the air duct once the throttle is exposed. Then, grab a small brush and gently scrub the interior to loosen all the varnish, dirt, and gum. [8] For this, you can use either an old toothbrush or a soft parts-cleaning brush , and wipe off the residue with paper towels every so often to clear the throttle one area at a time.
    • Continue to spray, scrub, and wipe the inside of the throttle body until all the metal is clean and bare.
    • It’ll be easier to monitor your progress if you shine a flashlight inside the throttle body between scrubbing. [9]
  3. Use a cotton swab to place the drop of oil right where the throttle shaft enters the body. This is done to help your car’s throttle blade rotate smoothly until the next cleaning. [10]
    • Keep in mind that you don’t need a lot of oil to do this. One drop is plenty!
  4. There’s no official ruling on how often you need to clean the throttle body, but you can keep your car running smoothly by doing this periodically. You can also look for a few signs that your car’s throttle body needs cleaning. [11] These include:
    • Your car has an unsteady idle, which drops when you come to a stop, and may even lead to an engine stall.
    • Your car’s “Check Engine” light might turn on.
    • You might have a hard time shifting while driving your car.
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Part 3
Part 3 of 3:

Cleaning Up Afterwards

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  1. Remove any dirt or liquid that may have spilled onto the car’s engine (or surrounding parts) while cleaning. Ensure that you wipe everything up before reattaching all components in the car that you moved earlier.
    • Clean off your tools and dispose of the paper towels and rubber gloves in the trash can. Keep in mind that the cleaner fluid is flammable, so you may want to wrap the paper towels in a bag and then throw them away.
  2. First, use the labels you made to attach ducts in the right places and tighten each clamp to the same degree they were initially. Then, reconnect the battery ; use your wrench to re-tighten the nut on the connector cable, securing it back in place. [12]
    • Move all tools and materials out from under the hood of your car before reattaching the battery.
    • To ensure you’re tightening clamps accurately, think about the force that went into loosening each clamp and apply roughly the same pressure as you tighten them back up. [13]
  3. This is a quick check to make sure everything is working smoothly. When you turn on your car’s engine, note that a stumble is common. You may even experience a rough idle; both are caused by cleaner fluid and residue that fall into the intake manifold. [14]
    • If either of these occurs, don’t panic. Your car will return to normal once the cleaner and residue burn away.
  4. If you cleaned the throttle body as part of routine maintenance, you might not notice much difference in your car’s drivability. If you cleaned the throttle body because it was getting too grimy, you’ll likely see a performance improvement—especially when idling and shifting gears. [15]
    • Even if your car doesn’t feel all that different, remember that cleaning the throttle body is supposed to be preventative. Your car will drive smoother in the long term!
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Expert Q&A

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  • Question
    How do I locate the throttle body?
    Michael Dey
    Automotive Technician
    Michael Dey is an Automotive Technician specializing in sharing detailed automotive content and restorations on rare and exotic vehicles. Michael has been passionately working on and restoring cars for over 15 years. He has a follower base of over 30,000 YouTube subscribers and 28 million views. Michael is a Factory Trained Master Guild Audi Technician and ASE Certified Master Automotive Technician.
    Michael Dey
    Automotive Technician
    Expert Answer
    To locate the throttle body in a car, you need to follow the path of the intake system. Begin by identifying the open-air intake, which is usually located near the headlights or front grille with the hood open. Once you've found this, look for a series of ducts or pipes leading from it. In turbocharged cars, these pipes will connect to the turbocharger. Next, locate the airbox, which is the component separating the open-air intake from the engine and houses the air filter. All intake air passes through the airbox. In naturally aspirated cars, follow the plumbing from the airbox until you reach the throttle body. For turbocharged cars, the path from the airbox will lead to a hard line or plumbing that connects to the turbocharger inlet. From there, the turbocharger outlet is piped to the throttle body. Manufacturers have different setups, so if you still can't locate your throttle body, I suggest consulting with your trusted mechanic.
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      Things You’ll Need

      • Eye protection
      • Rubber gloves
      • Flashlight
      • Torx or Phillips screwdriver
      • Old toothbrush or soft parts-cleaning brush
      • Throttle body cleaning fluid
      • Paper towels
      • Cotton swabs
      • Household oil

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      References

      1. ↑ https://www.youtube.com/watch?v=YiOtKbj75Hk
      2. ↑ https://www.jdpower.com/cars/shopping-guides/how-to-disconnect-a-car-battery
      3. ↑ https://www.mobil.com/en/lubricants/for-personal-vehicles/auto-care/vehicle-maintenance/how-to-do-it-yourself/proper-throttle-body-cleaning-guide
      4. ↑ https://www.popularmechanics.com/cars/how-to/a81/1272341/
      5. ↑ https://www.mobil.com/en/lubricants/for-personal-vehicles/auto-care/vehicle-maintenance/how-to-do-it-yourself/proper-throttle-body-cleaning-guide
      6. ↑ https://www.youtube.com/watch?v=YiOtKbj75Hk
      7. ↑ https://club.autodoc.co.uk/magazin/how-to-clean-a-throttle-body
      8. ↑ https://www.popularmechanics.com/cars/how-to/a81/1272341/
      9. ↑ https://www.youtube.com/watch?v=YiOtKbj75Hk
      1. ↑ https://club.autodoc.co.uk/magazin/how-to-clean-a-throttle-body
      2. ↑ https://club.autodoc.co.uk/magazin/how-to-clean-a-throttle-body
      3. ↑ https://www.youtube.com/watch?v=YiOtKbj75Hk
      4. ↑ https://club.autodoc.co.uk/magazin/how-to-clean-a-throttle-body
      5. ↑ ​​ https://club.autodoc.co.uk/magazin/how-to-clean-a-throttle-body
      6. ↑ https://club.autodoc.co.uk/magazin/how-to-clean-a-throttle-body

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