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Throttle Body Cleaning and Replacement
 
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Pelican Technical Article:

Throttle Body Cleaning and Replacement

Steve Vernon

Time:

3 hours3 hrs

Tab:

$10 to $375

Talent:

**

Tools:

T30, T25 Torx, 10mm, 8mm wrench, flathead screwdriver

Applicable Models:

VW GTI (2006-09)

Parts Required:

New throttle body gasket

Hot Tip:

You will need to recode the throttle body

Performance Gain:

Smoother-running engine

Complementary Modification:

New fuel filter

The throttle body on the GTI Mark V is a precision piece of equipment that is subject to a rather harsh environment. Turbo motors can increase the wear on a throttle body from the extra pressure and oil blow by. 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. If you are removing the throttle body to give it a good cleaning you will need to replace the gasket between the throttle body and the intake manifold. You will need to recode the ECM when installing a new throttle body and should be prepared to recode even if you are reinstalling the old one after cleaning.

Begin by safely jacking up and supporting the vehicle. Please see our article on safely jacking up and supporting your GTI MkV for additional information.

You will need to remove the lower engine tray.
Figure 1

You will need to remove the lower engine tray. A great many of these cars have had the engine trays and front side shields removed over the years and not replaced. If you happen to have a car that still has all the under trays and original hardware here is what you need to do. There are four T25 Torx screws (red arrows) on each side holding the tray on, remove them and slide the tray back out of the friction clips (yellow arrows) on the front air dam.

The charged air pipe and hoses run from the induction system and divert air before it reaches the throttle body (red arrow).
Figure 2

The charged air pipe and hoses run from the induction system and divert air before it reaches the throttle body (red arrow). This charged air runs through a pipe that is secured by an 8mm bolt (blue arrow) and T30 Torx (green arrow) and enters the interior by a quick release fitting (yellow arrow). Please see our article on removing the charged air pipe for additional information.

There is very little room to work on the front of the motor between the engine and the fans.
Figure 3

There is very little room to work on the front of the motor between the engine and the fans. Removing the fans and shroud will free up some much needed space, just be careful working around the exposed radiator when the shroud is removed. Please see our article on fan and shroud removal for further assistance.

With the front of the vehicle removed you can see the components that you will need to remove to get access to the throttle body.
Figure 4

With the front of the vehicle removed you can see the components that you will need to remove to get access to the throttle body. Note; you do not need to remove the front of the vehicle to perform this work but if you would like to please see our article on lock carrier removal. You can get to all these components from either above or below with the front of the car attached. With the charged air pipe removed (yellow arrow) you will be removing the lower turbo pipe (red arrow) you will need to remove the fasteners (green arrows) for the induction pipe.

On the lower left side unclip the quick release clip from the lower turbo hose and separate the hose from the intercooler (red arrow).
Figure 5

On the lower left side unclip the quick release clip from the lower turbo hose and separate the hose from the intercooler (red arrow). You can leave it attached to the induction pipe and remove it with the pipe or remove it completely now.

Disconnect the wiring connection (red arrow) from the boost sensor (yellow arrow).
Figure 6

Disconnect the wiring connection (red arrow) from the boost sensor (yellow arrow).

Use a flathead screwdriver and loosen the clamp on the throttle body hose (red arrow).
Figure 7

Use a flathead screwdriver and loosen the clamp on the throttle body hose (red arrow).

Working from below remove the T30 screw holding the charged air pipe bracket to the engine (red arrow).
Figure 8

Working from below remove the T30 screw holding the charged air pipe bracket to the engine (red arrow).

Working from the top of the vehicle remove the 10mm nut (red arrow) holding the charged air pipe bracket on and remove the pipe.
Figure 9

Working from the top of the vehicle remove the 10mm nut (red arrow) holding the charged air pipe bracket on and remove the pipe. Use care to wiggle it and the intake hose off the throttle body and out through the bottom of the vehicle.

Disconnect and remove the air intake wiring connector from the sensor (red arrows) and then remove the throttle wiring from the connection on the throttle body (yellow arrows).
Figure 10

Disconnect and remove the air intake wiring connector from the sensor (red arrows) and then remove the throttle wiring from the connection on the throttle body (yellow arrows). Both connections are simple push pull connections.

Working from underneath the front of the vehicle you can get easier access to the four T30 Screws (red arrows, only one shown) on the throttle body.
Figure 11

Working from underneath the front of the vehicle you can get easier access to the four T30 Screws (red arrows, only one shown) on the throttle body.

There is a series of hoses and wires that you will need to work around and through.
Figure 12

There is a series of hoses and wires that you will need to work around and through. I found that a six inch T30 driver worked best. Take your time and find the best angle to get the driver (red arrow) onto each screw (yellow arrow). You do not want to strip these screws so make sure the Torx is well seated before removing them.

With the screws removed you can remove the throttle body out of the vehicle from the top (red arrow).
Figure 13

With the screws removed you can remove the throttle body out of the vehicle from the top (red arrow). Watch for the radiator when removing it.

There is a rubber gasket (red arrow) that sits in a cut out in the intake manifold (yellow arrow).
Figure 14

There is a rubber gasket (red arrow) that sits in a cut out in the intake manifold (yellow arrow). This gasket causes a seal between the intake manifold and the throttle body and must be replaced even if you are reinstalling the old body.

Use some carburetor cleaner and give the throttle body and valve a good cleaning (red arrow).
Figure 15

Use some carburetor cleaner and give the throttle body and valve a good cleaning (red arrow). Installation is the reverse of removal. If you are installing a new throttle body you will need to recode the ECM and you should be prepared to recode even if reinstalling the old body.

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Comments and Suggestions:
notttravis Comments: This post is for the early mk5, FSI engine, is there a guide for the newer 08.5+ TSI engines. Thankyou!
November 5, 2016
  Followup from the Pelican Staff: All articles are here:

http://www.pelicanparts.com/techarticles/Volkswagen_Golf_GTI_Mk_V/VW_GTI_Mark_V_Tech.htm

I didn't see a later model version. - Nick at Pelican Parts
 
CaseyB Comments: During the last step, you mention the throttle body needs to be "recoded" By this, do you mean it requires VAG-COM/VCDS? Or can I simply turn the key to accessory and it will perform the realignment that way?
October 13, 2016
  Followup from the Pelican Staff: You need a scan tool to set the limit / adapt the new throttle housing. - Nick at Pelican Parts  

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Page last updated: Fri 12/9/2016 02:36:39 AM