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Throttle Body Cleaning
 
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Pelican Technical Article:

Throttle Body Cleaning

Jared Fenton

Time:

1 hour1 hr

Tab:

$10

Talent:

****

Tools:

5mm hex driver or socket, Standard screwdriver, spray cleaner

Applicable Models:

Audi A6 (1997-04)
Audi A6 Quattro (1997-04)
Audi S6 (2002-03)

Parts Required:

Throttle Body Gasket

Hot Tip:

Clean the throttle body thoroughly

Performance Gain:

Smoother running engine

Complementary Modification:

Replace throttle body boot

An easy project for the first timer is to clean out the throttle body on your Audi A6 2.7T. 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 requires you to remove the boost pressure sensor and engine covers beforehand. Please see our articles on Boost Pressure Sensor Replacement and Engine Cover Removal for more information.

Loosen and remove the two hose clamps (green arrows) and pull the turbo feed pipes out of the rubber boot on the front of the throttle body.
Figure 1

Loosen and remove the two hose clamps (green arrows) and pull the turbo feed pipes out of the rubber boot on the front of the throttle body. Use caution when doing so. You may crack the boot if it is old and dried up.

Press the tab (green arrow) on the electrical connector going to the throttle body with a small screwdriver and pull it off.
Figure 2

Press the tab (green arrow) on the electrical connector going to the throttle body with a small screwdriver and pull it off. Loosen the hose clamp (purple arrow) holding the rubber boot to the throttle body and pull it off.

Now loosen and remove the four 5mm hex bolts (green arrows) holding the throttle body to the intake manifold.
Figure 3

Now loosen and remove the four 5mm hex bolts (green arrows) holding the throttle body to the intake manifold.

A 5mm hex socket as shown here works well in removing the bolts due to the clearance with the turbo feed pipes.
Figure 4

A 5mm hex socket as shown here works well in removing the bolts due to the clearance with the turbo feed pipes.

Shown here is the throttle body removed from the engine.
Figure 5

Shown here is the throttle body removed from the engine. Note the buildup of oil mist and grease inside. You'll want to use some carburetor cleaner along with a toothbrush to clean the inside. Make sure you clean well around the vacuum fittings. (Note that the throttle body shown is for general reference, but similar enough for our purposes).

Be sure to remove the old gasket from the throttle body.
Figure 6

Be sure to remove the old gasket from the throttle body. In some cases, you may need to scrape all the remnants off with a razor blade. Be sure not to gouge the surface.

Here's the same throttle body after cleaning.
Figure 7

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 gasket where it mates to the intake manifold and don't over-tighten the bolts holding it in place. Installation is the reverse of removal.

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Page last updated: Fri 12/9/2016 03:02:06 AM