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Pelican Technical Article:

Throttle Body Cleaning

Jared Fenton

Time:

1 hour1 hr

Tab:

$10

Talent:

****

Tools:

XZN 8mm triple square driver, hose clamp pliers, carburetor cleaner, toothbrush

Applicable Models:

Jetta MkIV 2.0L (1998-05)

Parts Required:

Throttle body gasket

Hot Tip:

Clean the throttle body thoroughly

Performance Gain:

Smoother running engine

Complementary Modification:

Replace air filter

An easy project for the first timer is to clean out the throttle body on your VW Jetta. 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.

Loosen and remove the two hose clamps (green arrows) and pull the vacuum lines off the fittings leading into the throttle body.
Figure 1

Loosen and remove the two hose clamps (green arrows) and pull the vacuum lines off the fittings leading into the throttle body. A pair of hose clamp pliers works well here. Try twisting the vacuum hose on the fitting if it won't pull off. Also loosen and remove the large hose clamp (yellow arrow) holding the intake hose to the throttle body. Pull the intake hose off and set it to the side. See our article on Air Filter Replacement for more information.

Loosen and remove the four bolts (green arrows) holding the throttle body to the intake manifold.
Figure 2

Loosen and remove the four bolts (green arrows) holding the throttle body to the intake manifold. You'll need a XZN 8mm triple square driver. Don't try to remove them using a Torx driver. You'll just strip them out.

Don't forget to remove the electrical connector from the throttle body (green arrow).
Figure 3

Don't forget to remove the electrical connector from the throttle body (green arrow). Press the tab on the connector and pull it off.

Turn the throttle body over to remove the remaining vacuum hose.
Figure 4

Turn the throttle body over to remove the remaining vacuum hose. Use a set of hose clamp pliers to remove the clamp (green arrow) and pull the hose off.

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.

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. Don't over-tighten the bolts holding it in place. Installation is the reverse of removal.

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Page last updated: Sat 12/3/2016 03:10:14 AM