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Old 11-08-2009, 03:28 AM   #1
Ghettoracer
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1996 SC1
Wrench Throttle Body Cleaning

Well, I took off my throttle body yesterday and gave it a good cleaning. I noticed that there was A LOT of gummed up oil behind the throttle plate so I took off the throttle plate. After the cleaning, I notice a big jump in performance as far as acceleration and MPG.

Tools and cleaners needed:
1. 3/8ths ratchet
2. 10mm socket
3. Short Extension
4. T-10 Torx Bit
5. Flathead screwdriver
5. Carb Cleaner or brake cleaner
6. Few shop towels

Steps I used:
1. Took off my air intake tube using my flathead screwdriver.
2. Opened the throttle plate by the butterfly and took off the accelerator cable.
3. Unplugged the ICV and TPS clips that plugs into them.
4. Unplug the lines on top of the throttle body using a flathead, not prying up too hard on the clips or they will break. Try lifting a little with your fingertips once one side is unclipped and use the flathead again for the other side and gently pull up.
5. Using a 10mm socket, 3/8ths ratchet, and a short extension, took off the 2 bolts holding the throttle body making sure you do not drop the throttle body.
6. The throttle body gasket may stick to either the intake manifold or the throttle body. Make sure you try not to damage the gasket just in case you want to re-use it and set it aside.
7. Removed the throttle plate using a T-10 torx bit and removed both screws holding the plate in place and place in a small container cause they are quite small.
8. Rotate the butterfly to open the throttle plate and slide the plate out.
9. Use the same T-10 torx bit to remove the ICV and the rubber o-ring and place both screws and o-ring in the container. These two screws are bigger in size than the throttle plate screws. Make sure you note that. You can clean the o-ring with a shop rag if you like but don't spray it with carb cleaner or brake cleaner cause it will shrivel up and crack once heat is applied to it.
10. With the throttle plate out, spray a generous amount of cleaner onto the throttle body itself and ICV passages. Take your shop rags wipe it clean. You may have to shoot it with cleaner several times to remove the build up oil deposits. You can also use a small screwdriver and shop rag to clean the ICV passages.
11. Same thing happens to the throttle plate at this point. Spray a generous amount of cleaner onto the plate on both sides while using a shop rag to get the deposits off. It is clean when it looks like a polished silver look.
12. Cleaning the ICV pintle and spring, spray the ICV with cleaner. I used a shop towel and cleaner to clean the tip and a small fine brush and cleaner to clean the spring. Depending on how much cleaner you have left, I would just spray it until the liquid runs clear and let it dry.
13. Once everything is cleaned, its now time for re-assembly. Find the 2 T-10 screws for the ICV and the o-ring and re-install onto throttle body. Rotate the butterfly on the throttle body and slide in the throttle plate. There may be residual deposits in the shaft you slide in the throttle plate so make sure you wipe it again once the throttle plate is in. Take your last 2 screws for the throttle plate and tighten them down. Don't muscle down the screws or they will break.
14. Once you have your clean throttle body, check the gasket for damage. If its a paper gasket or really old gasket, you may want to replace it. Mine was still good so I cleaned it up a little with a shop rag and around the opening for the intake manifold.
15. I cleaned the opening and the flush face where the gasket sits with a razor blade. Then I took a shop rag with some cleaner on it and cleaned a little inside the intake plenum. Once that's nice and shiny, I re-installed my throttle body. Installation is the reverse of removing it.

Hope this write up is helpful to someone and feel free to add anything. Some people have different ways of cleaning throttle bodies. This one took me about 30-45 minutes to do and my acceleration and MPG has never been too good before I did this.

Cost of throttle body cleaning: Less than $10

...
1996 Saturn SC1 Coupe - 1.9L SOHC, 5 speed MP2
Mods: AEM CAI, Exhaust Muffler, more to come...

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Old 11-08-2009, 03:50 AM   #2
adventureoflink
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1997 SL2
Default Re: Throttle Body Cleaning

if you can post pictures with it and/or a video, that would be nice... my TB needs a good scrubdown

...
97 SL2
DOB: 3/19/97
Date Obtained: 5/30/07
Status: Alive, 1/2 exhaust

2004 Merc G.Marquis GS
DOB: 2/4/04
Date Obtained: 7/6/12
Status: Alive, no heat

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Old 11-08-2009, 06:40 PM   #3
braddojm
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1997 SL2
Default Re: Throttle Body Cleaning

Nice writeup. It really is amazing how a good tb cleaning will cure some ills. My 97 SL2 was idling high - cleaned the tb and settled right down to normal idle and much smoohter.

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Old 11-08-2009, 08:33 PM   #4
dorisSL
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1995 SL
Default Re: Throttle Body Cleaning

richpin has a vid on youtube (it's in three parts)

...
1995 SL, born 12/23/94, manual, WAI 190,500, "Doris"
(I'm Ben, the car is Doris)

you can't mulch at those speeds man, that's too fast

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