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Do-It-Yourself Projects
Cleaning Engine Throttle BodiesPrintable version
Degree of DifficultyEasy
Easy
Estimated Time45 minutes
45 minutes
Modern electronic fuel-injection systems are some of the most trouble-free systems in your vehicle. However, if your vehicle has accumulated more than 75,000 miles, there is some routine fuel-injection-system maintenance that should be considered. The two most common maintenance jobs are fuel-injector cleaning and throttle-body cleaning. Cleaning fuel injectors is generally not a do-it-yourself project, but you can clean the throttle body on your vehicle with common tools and specialized spray cleaners.

While throttle-body cleaning is good preventative maintenance, it should also help engine drivability. In fact, if you've noticed a rough idle, stumbling initial acceleration or even stalling - all when the engine is fully warmed up - a dirty throttle body could be the culprit. Once you look inside a throttle body, you will probably be surprised at the dirt, gum and varnish that have accumulated there over time.
Setup
Park your vehicle outside in a well-lighted, level area. Because the throttle-body cleaners are volatile, we do not recommend doing this job indoors.

Locate the throttle body under the hood in the engine compartment. Here are some hints on what to look for:
  • The throttle body is located between the air cleaner and the intake manifold of the engine.
  • Most throttle bodies are made of aluminum.
  • The throttle body is connected to the gas pedal of your vehicle with a linkage or flexible cable, which moves the throttle shaft when the gas pedal is depressed. (If you're having difficulty locating the throttle body, ask a helper to press the accelerator - with the engine off - so you can see the movement of the throttle shaft.)
Once you have located your vehicle's throttle body, look at how it is attached to the air-intake tubes. Sometimes throttle bodies are attached with special fasteners called Torx-head screws. If so, you will need Torx bits or Torx screwdrivers to remove these fasteners. More commonly, a flat-blade or Phillips-head screwdriver should do the trick.

There may be one or more electrical wires that connect to the throttle body. Do not disturb these; for purposes of this project, you should not need to disconnect any of these terminals.

While we always recommend that you follow all appropriate safety precautions for these DIY projects, this is even more important for this project. Do not smoke when you are working on your vehicle, wear all recommended skin and eye protection and generally be aware that you are dealing with a flammable spray cleaner.
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