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Old 07-07-2008, 05:34 PM
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Join Date: Jan 2007
Location: Live Oak, FL
Vehicle: 1998 Ford F-150
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Cleaning the 4.2L Throttle Body

For those in speculation on whether or not to clean the throttle body on your truck. It is very straight-forward to do and should only take a maximum of 30 minutes to do. Anyone who knows how to turn a screw can do this.

Note: Proceed at your own risk. This post is solely for informational purposes only. I will not be held responsible for any damages to occur. Also, this process was done with an aftermarket K&N Series-77 Cold Air Intake in place of the stock intake. If you have a stock intake, or another brand of intake with different mounting pieces, the process may be different.

1.) Here's the first step in doing this. Take a trip to your local automotive store and pick up a can of Throttle Body Cleaner. DO NOT get Carb cleaner, these vehicles are fuel injected. I picked up a 12 oz. can of STP Throttle Body/Intake Cleaner. Some places may reject customers under 18, but my AutoZone didn't so for those under age, check before you stand in line for 20 minutes.

For my intake, I used a 6/29 Allen wrench and you can opt. to use a 10mm wrench to take off the throttle cable cover for additional room to work with.



2.) I opted to take off the throttle cable cover so I could spin up the engine from the engine bay rather than being in the cab. Remove both 10mm bolts and place aside. I then used a 6/29 Allen wrench head and removed both brackets on my 90 degree elbow to my CAI tube. I used the rubber fitting to hold it out of the way.





3.) Shake the can well and fire away. You can immediately see all the carbon buildup wash away. Pull the throttle butterfly open and spray down there. The opening past the butterfly leads to the intake manifold, so your engine will be hesitant to start at first. Once you belive you have used enough to clean it out, let it all air dry and behind reassembly.


Last edited by Raptor05121; 07-07-2008 at 05:39 PM.
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Old 07-07-2008, 05:36 PM
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Join Date: Jan 2007
Location: Live Oak, FL
Vehicle: 1998 Ford F-150
Posts: 2,415
Note: Hold your breath when you spray and be sure to use safely glasses if you have them, this stuff stinks!

Dirty:



Clean:





4.) Reassemble:

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Old 07-07-2008, 05:37 PM
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Join Date: Jan 2007
Location: Live Oak, FL
Vehicle: 1998 Ford F-150
Posts: 2,415


5.) Make sure you dont have any tools lying around and go start your engine. Mine took 3 tries and about 5-8 seconds a time before it fired. It will act sluggish as it burns it through. You may need to press on the gas a bit to help it out. After a minute, she will be cleaned out. Proceed to enjoy your more responsive engine and better economy!

Edit: If any moderators could make this a sticky for future reference, I'm sure many would appreciate it!

-Alex
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Thanks dirtyd88!
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Old 07-07-2008, 05:54 PM
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Join Date: Sep 2002
Location: Seffner,Florida
Vehicle: 2007 Ford F150
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Very well done.........but,you didn't use the soft bristle tooth brush! If you had,you would have removed more carbon! Trust me on this; I use to clean mine on my 97 every 3k miles,and the IAC valve every 10k miles!
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2007 F150XL,4.2V6,3:55 non L/S,auto
Dark Blue Pearl Metallic
Injection is nice but ide rather be Blown!!!
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