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Throttle Body Cleaning Replacement
 
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Pelican Technical Article:

Throttle Body Cleaning Replacement

Steve Vernon

Time:

1 hour1 hr

Tab:

$2 to $10

Talent:

**

Tools:

5mm Allen, flathead screwdriver, degreaser, shop rags

Applicable Models:

Porsche 944 Turbo (1986-89)

Parts Required:

New throttle body O-ring

Hot Tip:

Do NOT strip the bolts

Performance Gain:

Smoother-running engine

Complementary Modification:

New air filter

The throttle body on the Porsche 951 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 O-ring between the throttle body and the intake manifold.

The throttle body can be replaced without lifting the vehicle.

Begin by using a flathead screwdriver and removing the air intake to air box tube (red arrow).
Figure 1

Begin by using a flathead screwdriver and removing the air intake to air box tube (red arrow).

This will give you access to the intercooler to throttle body tube (yellow arrow).
Figure 2

This will give you access to the intercooler to throttle body tube (yellow arrow). The throttle is bolted to the intake manifold (red arrow) and has several components you will need to disconnect.

Use a flathead screwdriver and remove the clamp on the tube to intercooler.
Figure 3

Use a flathead screwdriver and remove the clamp on the tube to intercooler. You will need to remove the tube completely and not just the rubber sleeve between the tube and throttle body, as you will need the room to work when removing the bolts. Disconnect the two hoses connected to the tube and remove the tube (red arrows).

Disconnect the throttle switch connection from the switch mounted on the throttle (red arrows).
Figure 4

Disconnect the throttle switch connection from the switch mounted on the throttle (red arrows). The switch will stay mounted to the throttle body when you remove it. Disconnect the vacuum hose from the bottom of the body (yellow arrow).

Rotate the throttle cable housing back (red arrow) with your hand and slip the throttle cable out from the housing (yellow arrow).
Figure 5

Rotate the throttle cable housing back (red arrow) with your hand and slip the throttle cable out from the housing (yellow arrow).

Us a 5mm Allen and remove the four bolts holding the throttle body to the intake manifold (red arrows).
Figure 6

Us a 5mm Allen and remove the four bolts holding the throttle body to the intake manifold (red arrows). You must make sure the Allen is well seated in each bolt. It is also a good idea to give each one a tap with a hammer before trying to remove them. The steel bolt in the aluminum tends to corrode together. There is very little room around the throttle body to get an Allen socket in, so if you do not already own a set of long Allen keys, you should seriously consider buying one. If you strip out the lower bolts, you will probably need to remove the intake manifold to remove the bolts.

Remove the throttle body from the manifold.
Figure 7

Remove the throttle body from the manifold. Note that the throttle switch (red arrow) and throttle cable return spring (yellow arrow) stay attached to the housing.

Clean the butterfly on the throttle (red arrow) along with the walls.
Figure 8

Clean the butterfly on the throttle (red arrow) along with the walls. Always replace the O-ring gasket between the throttle body and intake manifold (yellow arrow). Installation is the reverse of removal.

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