How to clean your throttlebody
- Carburetor cleaner. Any cheap brand will do. You can find it at your parts store, or even Wal-Mart
- Rags to soak up the mess
- Old toothbrush or other small items to get in the tight places
- Sockets/wrenches & other misc tools
How To Do It
Remove the intake tube by Loosen the hose clamp around the intake tube & throttlebody and remove the intake tube from the throttlebody. If you have the stock air intake, loosen the hose clamp on the airbox as well, and remove the hose from the car. The closeup image of the throttlebody shows my custom intake attached, so unless you have a custom intake, yours won't look like that.
Remove the black vacuum hoses from the top of the throttle body. You can see them in the picture above, grouped in three.
Now unbolt the TB by removing the 2 bolts holding the throttle body on the plenum using a 13mm socket. You should remove these bolts to free up the TB from the plenum, so you can have access to the back of the throttle body. This isn't necessary, but you can get it much cleaner with access to the back. The throttle body wont come completely off because the throttle cable and stuff are still hooked on. You can remove these if you like to get it all the way off, but it is not necessary.
You can also remove the IAC plate on the top of the throttle body, as well as the valve attached to the plate. It is held in place with about 5 torx screws. This will give you access to a bunch of little passageways, as well as the end of the IAC valve, that will be full of black gunk. This is not necessary, but as long as you are cleaning it, you might as well do a good job. If you are still having idling problems after cleaning, and you did not clean the valve, you should definately do so.
Time to clean that baby! Spray that carb cleaner into the TB. You should put a rag under the TB to catch the junk that runs out so it doesnt get all over. It can ruin paint! List the throttle lever to open the throttle butterfly so you can spray inside. If you unbolted the TB, be sure to spray if from behind as well. If you removed the IAC, clean all the passages under it on the TB, as well as the passages in the IAC itself. Use an old toothbrush if necessary
Once you think you have everything nice and clean, put it all back together in the reverse order you took it apart. But before you reassemble, maybe you want to get a more thorough clean, and clean the inside of the plenum as well?
Fire the engine up. It may take some extra craking for it to start, and You might have to give it a little gas right off the bat to keep it running, depending on how much cleaner you actually got inside, but after that, it run a heck of a lot better!
Note: If your car idles excessivly high, and/or a check engine light comes on after cleaning, you probably have a vacuum leak. Make sure you reconnected all vacuum lines, make sure you didnt crack any, and make sure you didn't damage the TB gasket.