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Old 08-22-2011, 08:31 AM   #1
nertil1
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Default Throttle Body Cleaning

Hey guys,

How do you go about cleaning the throttle body? I know that you have to take the cover off and I've heard that GM sells a cleaner you can get. Do you just spray it in the while the engine is running? If so, where do you exactly spray it? Or can you just get a rag and clean it by hand?

Thanks!
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Old 08-22-2011, 09:54 AM   #2
MalibuKen
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Default Re: Throttle Body Cleaning

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Originally Posted by nertil1 View Post
How do you go about cleaning the throttle body?
What makes you think it NEEDS cleaning ??
Auto parts stores sell the stuff too; probably a good bit cheaper.

It looks somewhat like the throat of a carb. Just a wide, open hole with a plate at the bottom.

Warm the engine. Take the duct work loose, or off.
Spray a little cleaner around inside the hole.
Let it sit for 15 seconds or so and then start the engine.
Spray some more around in the hole; not too much.
Shut off engine.
Repeat once more.
Done.

DO NOT STICK A RAG OR ANYTHING ELSE IN THERE.

P.S. While having the dealership do this costs a good bit more, giving the "technician" a chance to inspect the throat and other associated parts is worth something. They might notice another problem that you would miss.

Last edited by MalibuKen; 08-22-2011 at 09:57 AM.
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Old 08-22-2011, 03:48 PM   #3
nertil1
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Default Re: Throttle Body Cleaning

There's nothing wrong but I'm close to 50K and I'm sure some gunk has collected in there. Ok thanks!
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Old 08-22-2011, 04:11 PM   #4
Rodents
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Default Re: Throttle Body Cleaning

Quote:
Originally Posted by MalibuKen View Post
Warm the engine. Take the duct work loose, or off.
Spray a little cleaner around inside the hole.
Let it sit for 15 seconds or so and then start the engine.
Spray some more around in the hole; not too much.
Shut off engine.
Repeat once more.
Done.

DO NOT STICK A RAG OR ANYTHING ELSE IN THERE.
Yeah, prior to electronic throttle control, you're correct but these cars are now electronic throttle control, no accelerator cable. You DON'T want any cleaner to seep into that throttle body. Take the air intake off the throttle body, use a clean rag and spray the rag with carb cleaner or even brakeclean works too. Get the rag good and wet but not soaked and open the throttle plate by hand and wipe the area where the throttle plate rests in the bore and wipe the end of the plate off as well. No need to go real deep but get the area around the plate good and clean.

Don't use anything that will scratch the throttle body like a screwdriver that rips through the rag and gouges the bore. Now all of this is done with the key off. Doesn't have to be a warm engine.
Now when you reassemble the air intake and you start the engine, the idle will be higher than normal for a few minutes, it should settle on it's own as the ECM learns to adjust to the new air flow around the throttle plate. Even the first few stops you make while driving you may get the feeling that the car is pulling a little, give it time to adjust, and you should be good to go.
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Old 08-22-2011, 04:25 PM   #5
nertil1
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Default Re: Throttle Body Cleaning

Thanks Rodents!

To get to the throttle body, you have to remove the 2 hose clamps connected to the engine cover. I can get the one on the air filter off, that's pretty easy but how do you get the one under the cover off (right in front of the throttle body). I can see the screw pointing out on the right side under the cover and I can loosen it with a long flat head but I'm afraid to take it off because I won't be able to get it on again. It's such a tight space in the there.
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Old 08-22-2011, 04:28 PM   #6
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Default Re: Throttle Body Cleaning

Quote:
Originally Posted by nertil1 View Post
Thanks Rodents!

To get to the throttle body, you have to remove the 2 hose clamps connected to the engine cover. I can get the one on the air filter off, that's pretty easy but how do you get the one under the cover off (right in front of the throttle body). I can see the screw pointing out on the right side under the cover and I can loosen it with a long flat head but I'm afraid to take it off because I won't be able to get it on again. It's such a tight space in the there.


Don't loosen it all the way, just enough to get the inlet housing off, maybe 7 or 8 turns tops. There should be a stop molded into the housing rubber sleeve that holds the clamp from turning too far. It looks worse than it is.
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Old 08-22-2011, 04:56 PM   #7
nertil1
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Default Re: Throttle Body Cleaning

Yes, I'm was just gonna loosen it but when I remove the cover, the hose will come off with it correct? My issue is how do I get the hose back on nice and tight on the rubber sleeve to tighten the clamp? I can't wiggle the hose back on the sleeve because there's no room for my hand.
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Old 08-22-2011, 06:53 PM   #8
Rodents
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Default Re: Throttle Body Cleaning

As long as you just loosen the clamp at the throttle body and work the housing straight up, you should be okay. Sometimes there's an insert that comes off but it just slides back on the housing before you put everything together. There's no need to get your hand in there to position anything after you install the housing. You position the components before setting the housing back on the throttle body. Just watch the throttle body area as you pull the housing off, that way if some pieces separate you should be able to see how they were put together.
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Old 08-22-2011, 07:52 PM   #9
nertil1
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Default Re: Throttle Body Cleaning

Ok, I see what you're saying. Thanks a lot Rodents!
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Old 08-23-2011, 06:43 AM   #10
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Default Re: Throttle Body Cleaning

I found it much easier to clean by removing the actual throttle body from the intake manifold. Its only four bolts.
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