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Pelican Technical Article:

Airbox Removal

Steve Vernon

Time:

30 minutes30 mins

Tab:

$0

Talent:

**

Tools:

Flex-shaft, 7mm socket, 10mm wrench

Applicable Models:

Porsche 993 Carrera (1996-98)
Porsche 993 Carrera 4 (1996-98)
Porsche 993 Carrera 4S (1996-98)
Porsche 993 Carrera S (1998)
Porsche 993 Targa (1996-98)
Porsche 993 Turbo (1996-97)

Hot Tip:

Do not use oiled filters

Performance Gain:

Access to the right side of the engine

Complementary Modification:

Replace air filter

The airbox on the 993 covers most of the access to the right side of the engine. You will need to remove the box to service many of the components on the right side including the MAF, fuel rail and power steering pump to name a few. Removing the airbox is quick and simple and even if you are not doing further work it is a great way to see more of the systems on the motor.

Over the years your car may have been serviced by multiple people including previous owners and this can lead to parts replaced with different size fasteners and hardware. The sizes of the nuts and bolts we give may be different from what you have so be prepared with different size sockets and wrenches. If something is different on your vehicle please let us know and share your info to help other users. If you have any questions or comments or even a different procedure you would like to share please leave it below and please leave your vehicle information.

Whether you have an OBD1 engine, Varioram, Tiptronic or standard transmission the airbox is on the right side of the engine (red arrow).
Figure 1

Whether you have an OBD1 engine, Varioram, Tiptronic or standard transmission the airbox is on the right side of the engine (red arrow).

If your car has a manual transmission there is a rubber hose connected to the cover by the air opening (red arrow).
Figure 2

If your car has a manual transmission there is a rubber hose connected to the cover by the air opening (red arrow). Simply pull this hose off.

Tiptronic transmissions do not have this hose and the opening is capped off (red arrow).
Figure 3

Tiptronic transmissions do not have this hose and the opening is capped off (red arrow).

Begin by releasing the two clips for the air box lid (red arrows) and remove the lid and filter, note that on standard transmission lids there will be an additional hose you need to remove.
Figure 4

Begin by releasing the two clips for the air box lid (red arrows) and remove the lid and filter, note that on standard transmission lids there will be an additional hose you need to remove.

Tilt the filter out and then pull it straight back and out (red arrow).
Figure 5

Tilt the filter out and then pull it straight back and out (red arrow).

Use a 10mm wrench and remove the bolt that holds the wiring harness and air box to the top of the intake manifold (yellow arrow).
Figure 6

Use a 10mm wrench and remove the bolt that holds the wiring harness and air box to the top of the intake manifold (yellow arrow). Reach in and squeeze the wiring connection for the air temperature senor and disconnect the wiring from the sensor (red arrow)

Reach in and disconnect the wiring to the MAF sensor by turning it counter clockwise (red arrow).
Figure 7

Reach in and disconnect the wiring to the MAF sensor by turning it counter clockwise (red arrow). Next you will need to use a flex-shaft and 7mm socket to reach the hose clamp that holds the MAF to the manifold (yellow arrow)

With the clamp loosened, reach in and rotate the MAF housing towards the front of the vehicle until the electrical connection is pointing straight up (red arrow).
Figure 8

With the clamp loosened, reach in and rotate the MAF housing towards the front of the vehicle until the electrical connection is pointing straight up (red arrow).

Next use your flex-shaft and 7mm socket and loosen the clamp connecting the inside of the airbox housing to the lower hose (red arrow).
Figure 9

Next use your flex-shaft and 7mm socket and loosen the clamp connecting the inside of the airbox housing to the lower hose (red arrow). When separating the airbox make sure this clamp does not drop down into the engine as it is a pain to find.

Reach your hand into the MAF and push the air box off of it while slightly lifting the box (red arrow).
Figure 10

Reach your hand into the MAF and push the air box off of it while slightly lifting the box (red arrow). The MAF housing will not come out of the engine bay while attached to the airbox

Lift the airbox up and out.
Figure 11

Lift the airbox up and out. It is a tight fit but take your time and it will slip out no problem if you have everything disconnected.

With the airbox out you can see the air temperature sensor (red arrow) and the two spuds the air box sits on (yellow arrow).
Figure 12

With the airbox out you can see the air temperature sensor (red arrow) and the two spuds the air box sits on (yellow arrow).

With the airbox and MAF sensor out of the car you can see how it rotates in the airbox to clip into the box (red arrow).
Figure 13

With the airbox and MAF sensor out of the car you can see how it rotates in the airbox to clip into the box (red arrow). This is an important step when reinstalling as you will have to place the MAF housing back into the manifold in the straight up position and then when the airbox is installed rotate it towards the rear to clip it into place.

Here are the two mounting studs that the airbox will sit on (red arrows).
Figure 14

Here are the two mounting studs that the airbox will sit on (red arrows). The forward stud is missing its spacer. Installation is the reverse of removal.

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Page last updated: Sat 4/29/2017 03:15:27 AM