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Throttle Body Cleaning
 
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Pelican Technical Article:

Throttle Body Cleaning

Jared Fenton

Time:

1 hour1 hr

Tab:

$0 to $275

Talent:

**

Tools:

Screwdrivers, T30 Torx driver, pliers

Applicable Models:

Porsche 955 Cayenne (2004-10)
Porsche 955 Cayenne GTS (2008-10)
Porsche 955 Cayenne S (2003-10)
Porsche 955 Cayenne Turbo (2003-10)
Porsche 955 Cayenne Turbo S (2006-10)

Parts Required:

Throttle body gasket

Hot Tip:

Use care when moving the throttle butterfly

Performance Gain:

Smoother running engine

Complementary Modification:

Replace intake plenum boots

An easy project for the first timer is to clean out the throttle body on your Porsche Cayenne. As the miles build up on your car, the emissions control devices on your engine allow a certain amount of air back into the intake. This air is typically mixed with a combination of carbon and also oil vapors. Over time, this mist leaves deposits on the throttle body which if not cleaned periodically, can lead to uneven running or even a sticking throttle.

Removing the throttle body is a simple procedure that can be done in under an hour. Begin by opening the hood and removing the engine covers (see our article on engine compartment cover removal for more information). You'll also need to remove the front cover on the engine itself. This is the one that reads either "Turbo" or "4.5L V8". Simply pull up on it to remove.

Begin removal of the throttle body by first loosening the two hose clamps holding the plastic boots to the intake plenum (green arrows).
Figure 1

Begin removal of the throttle body by first loosening the two hose clamps holding the plastic boots to the intake plenum (green arrows). You'll also want to remove the electrical connection to the throttle body in order to access the mounting pin below (yellow arrow). Squeeze the two tabs on the top and bottom of the connector and pull the switch off.

Now you'll need to remove the plastic boots from both sides of the intake plenum.
Figure 2

Now you'll need to remove the plastic boots from both sides of the intake plenum. Pull each boot back far enough to free it but take care not to damage the boot.

The intake plenum is held to the throttle body by two long plastic T30 Torx pins.
Figure 3

The intake plenum is held to the throttle body by two long plastic T30 Torx pins. You'll need to rotate each pin so that the mark on the pin (green arrow) lines up with the mark on the bracket (yellow arrow). This mark corresponds with a locking tab on the bottom of the pin. Once lined up, pull the pins up and out. This may take a bit of effort and it's not uncommon to see the locking tabs broken. If the tabs are broken, don't worry about it.

Now carefully pull the plenum off the throttle body.
Figure 4

Now carefully pull the plenum off the throttle body. You'll now want to carefully lift the plenum up high enough to disconnect the vacuum fitting below (green arrow). Squeeze the two tabs in and pull the fitting off.

On the right of the throttle body, you'll see a valve attached to a bracket by a rubber sleeve (green arrow).
Figure 5

On the right of the throttle body, you'll see a valve attached to a bracket by a rubber sleeve (green arrow). Use a screwdriver to carefully pull the sleeve off the bracket.

Now you're ready to remove the throttle body.
Figure 6

Now you're ready to remove the throttle body. Remove the four T30 Torx bolts holding the throttle body to the intake manifold (green arrows, Note that the right lower bolt is not visible in this Picture). Once the throttle body is removed, carefully remove the bracket and set it aside.

Shown here is the buildup of carbon and oil sludge on the backside of the throttle body.
Figure 7

Shown here is the buildup of carbon and oil sludge on the backside of the throttle body. Clean the deposits off with some carburetor or brake cleaner on a soft, clean rag. You don't want to scratch the surface of the throttle bore or the butterfly. Also keep in mind that the throttle body on the Porsche Cayenne is electronically operated. There is no direct link between the pedal and the engine. That said, take care when rotating the butterfly. You will encounter a bit of force to move it, but don't force it. You could damage the unit, which is very expensive and requires the factory computer to mate it with the engine.

Here's the same throttle body after cleaning.
Figure 8

Here's the same throttle body after cleaning. You can really see the difference here after a few minutes work. When re-installing the throttle body, use a new seal where it mates to the intake manifold and don't over-tighten the bolts holding it in place.

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Comments and Suggestions:
Kevin N Comments: My car was running rough on cold start. Took it to my local high end car repair shop, not the dealer. They cleaned the throttle body for me for $200. Car runs great now! I suggest you find a local reputable service shop, or try the simple procedure above, exercising caution as described.
August 1, 2016
  Followup from the Pelican Staff: Thanks for the additional info and feedback. We appreciate it.
- Nick at Pelican Parts
 
Michael S Comments: Good day to you. Please note that I have contacted my local porsche dealer to make an appointment for throttle body cleaning and they have advised me that they don't suggest to open the throttle for clean. They said that a problem will occur afterwards. What is your opinion? You have an article abt that..
July 27, 2016
  Followup from the Pelican Staff: Some shops prefer cleaning them, then resetting adaptations if needed. If done right, you will not affect the throttle plate coating. Follow the steps in the article, you should be OK. - Nick at Pelican Parts  

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