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Pelican Technical Article:

Throttle Body Cleaning Replacement

Steve Vernon

Time:

1 hour1 hr

Tab:

$10

Talent:

**

Tools:

5mm Allen, flathead screwdriver

Applicable Models:

VW Golf GTI (2000)
VW Golf GTI 1.8T (2002-05)
VW Golf GTI 20th Anniversary (2003)
VW Golf GTI 337 (2002)
VW Golf GTI GLS (2001)

Parts Required:

New throttle body gasket

Hot Tip:

Remove the throttle body and let it soak in carburetor cleaner overnight

Performance Gain:

Smoother-running engine

Complementary Modification:

New fuel filter

The throttle body on the GTI Mark 4 is a precision piece of equipment that is subject to a rather harsh environment. After years of reliable service, the throttle body may become dirty or clogged, which may result in lowered performance. A simple good cleaning may be all that is needed to restore performance and improve mileage,

The throttle body is relatively easy to remove and clean. It is located on the left side front of the engine connecting the rubber intake tube to the intake manifold.

Before you begin work make sure that you have a new throttle body gasket, even if you are just taking the throttle body off to clean you will need to install a new gasket when you put it all back together.

Begin by using a flathead screwdriver and removing the clamp holding the intake hose to the throttle body. With the clamp off wiggle the hose off the throttle body and tie it aside out of the way.

Next remove the clamp and pull the small emission hose off the top of the body.

There are four 5mm Allen bolts that hold the throttle body to the intake manifold. Use a 5mm Allen and remove these.

Separate the body from the intake runner, turn it over and remove the electrical connection.

Take your throttle body to a cleaning tub or some other suitable catch container. Use a good quality carb cleaner and Scotch Brite pad and give the interior of the body a good cleaning.

The throttle body passes a high volume of air through it so the cleaner you can get it the better performance you will get.

Make sure you remove the old gasket and clean the two mounting surface areas well.

Installation is the reverse of removal.

The throttle body (yellow arrow) is relatively easy to remove and clean.
Figure 1

The throttle body (yellow arrow) is relatively easy to remove and clean. It is located on the left side front of the engine connecting the rubber intake tube (red arrow) to the intake manifold (blue arrow).

Begin by using a flathead screw diver and removing the clamp (yellow arrow) holding the intake hose to the throttle body.
Figure 2

Begin by using a flathead screw diver and removing the clamp (yellow arrow) holding the intake hose to the throttle body.

With the clamp off wiggle the hose off the throttle body and tie it aside out of the way (yellow arrow).
Figure 3

With the clamp off wiggle the hose off the throttle body and tie it aside out of the way (yellow arrow).

Next remove the clamp and pull the small emission hose off the top of the body (yellow arrow).
Figure 4

Next remove the clamp and pull the small emission hose off the top of the body (yellow arrow).

There are four 5mm Allen bolts (yellow arrows, two shown) that hold the throttle body to the intake manifold.
Figure 5

There are four 5mm Allen bolts (yellow arrows, two shown) that hold the throttle body to the intake manifold. Use a 5mm Allen and remove these.

Separate the body for the intake runner, turn it over and remove the electrical connection (yellow arrow).
Figure 6

Separate the body for the intake runner, turn it over and remove the electrical connection (yellow arrow).

Take your throttle body to a cleaning tub or some other suitable catch container.
Figure 7

Take your throttle body to a cleaning tub or some other suitable catch container. Use a good quality Carb cleaner and Scotch Brite pad and give the interior of the body a good cleaning.

The throttle body passes a high volume of air through it so the cleaner you can get it the better performance you will get.
Figure 8

The throttle body passes a high volume of air through it so the cleaner you can get it the better performance you will get.

Make sure you remove the old gasket (yellow arrow) and clean the two mounting surface (red arrow) areas well.
Figure 9

Make sure you remove the old gasket (yellow arrow) and clean the two mounting surface (red arrow) areas well.

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Page last updated: Fri 12/9/2016 02:34:47 AM