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Old 09-11-2010, 09:43 PM   #1
Darthenstein
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Cleaning throttle body

Hey everyone,

2009 Focus SES 5spd 26,000 miles

I used to do on my old cars a procedure called cleaning the throttle body. I would spray some carb/throttle body cleaner directly onto the throttle body while the engine was running. This involved disassembling the air intake tube, disconnecting the MAF sensor so the car's computer would not stall the engine, and I could control the valve by pushing the spring with my thumb.

I have noticed that on my Focus I have the new drive-by-wire system, where the system is sealed and I can't really hold anything open, and I am a bit worried about opening it up myself.

Is there a way of doing this with drive-by-wire? Does it even need to be done? My car feels a little slower but it has gotten much colder out lately so that might be it.

Thank you very much!


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Old 09-12-2010, 08:10 AM   #2
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I'm not entirely sure it's necessary on these cars. The inside of the TB has some sort of coating on it behind the butterfly IIRC. Also, i remember that it may strip the coating off the inside of the TB if the wrong (or possibly any) solvent is used.

IF the DBW system is similar to a mustang's, you can just unbolt the servo motor for the DBW system and rotate the butterfly by manipulating the butterfly shaft by hand.

Obviously, doing this while the car is running is impossible and stupid, because the MAF can't read, and the car can't control the mix, and may not run at all.

In any case, unless you've never had an air filter on that car, at 26k it shouldn't be an issue to begin with.
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Old 09-12-2010, 12:10 PM   #3
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we are not supposed to spray cleaner on the throttle body on these cars. it will ruin the idle air control valve and remove the special coating on the throttle body. I believe ford has a certain procedure to clean the tb if it is neccesary. Mine has 67000 miles and is still fine so I wouldn't go messin with it personally.
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Old 09-12-2010, 12:52 PM   #4
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Sounds good...I did some looking around and they also said something about a special lining...also if I move the butterfly with my hands it can take a bit to relearn idle and all that fun stuff!

I had to do my Taurus quite frequently, as well as a bunch of the other guys...but that was pretty much a different car. Also, it is warmer out today and everything seems normal again so I guess that was it!

I'm glad I don't have to do it...it is kinda a PITA. Thank you!
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Old 09-12-2010, 06:01 PM   #5
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probably nothing wrong with your car I think all cars feel faster when they are new. At least they do to me. My focus seemed to be more spunky when new but, I think its just my imagination. Probably should start pickin on cars my own size. haha.
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Old 09-24-2010, 09:54 PM   #6
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So what would you use when you NEED to clean the throttle body? I just checked mine and there's a thick film of DIRT on the butterfly valve and a little on the sides.
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Old 09-25-2010, 02:01 AM   #7
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What would I do?

If there's a THICK film of dirt on the throttle blade, i'd reckon something's up with your air filtration. Fix this FIRST. If it's the more likely situation (gasoline deposits and general engine-running gunk), skip this step.

Then, because that sounds like a lot of (very abrasive) dirt/organic material, i'd consider REMOVING the TB and cleaning it with a non-solvent cleaner and a soft brush.
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