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Pelican Technical Article:

Non-Varioram Airbox Removal

Steve Vernon

Time:

1 hour1 hr

Tab:

$0

Talent:

**

Tools:

Long Philips head screwdriver, 10mm wrench

Applicable Models:

Porsche 993 Carrera (1995)
Porsche 993 Carrera 4 (1995)

Hot Tip:

It's a tight fit but don't force it

Performance Gain:

Access to the right side of the motor

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 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 inspect the systems on the right side of 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 you have a standard transmission, pull the rubber breather hose from the bell housing off the lid (red arrow), then release the two clips and remove the lid.
Figure 2

If you have a standard transmission, pull the rubber breather hose from the bell housing off the lid (red arrow), then release the two clips and remove the lid. If you have a Tiptronic this opening will be plugged on the lid as there is no hose from the bell housing.

Remove the air filter, if your filter is covered with brown dust you should inspect your clutch and be prepared to replace it in the near further.
Figure 3

Remove the air filter, if your filter is covered with brown "dust" you should inspect your clutch and be prepared to replace it in the near further. This even brown material (pictured here) is actually clutch wear.

Use a 10mm wrench and remove the bolt that holds the wiring harness and air box to the top of the intake manifold (red arrow).
Figure 4

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

There are two clips that hold the MAF housing to the air box housing (red arrows).
Figure 5

There are two clips that hold the MAF housing to the air box housing (red arrows). Reach in and unclip these.

Use your long handle Philips screwdriver and loosen the hose clamp on the lower hose to airbox and slip the hose off the box (red arrow).
Figure 6

Use your long handle Philips screwdriver and loosen the hose clamp on the lower hose to airbox and slip the hose off the box (red arrow).

Lift the airbox up off the spud it sits on and you can now remove the airbox from the engine compartment; it is a tight fit but it will slip out.
Figure 7

Lift the airbox up off the spud it sits on and you can now remove the airbox from the engine compartment; it is a tight fit but it will slip out.

With the airbox removed you can see the rubber spud that is sits in on the right side of the manifold (red arrow).
Figure 8

With the airbox removed you can see the rubber spud that is sits in on the right side of the manifold (red arrow).

With the housing and airbox out of the vehicle you can see how the MAF clips to the box (red arrows).
Figure 9

With the housing and airbox out of the vehicle you can see how the MAF clips to the box (red arrows). Before installing the new housing put a little lubricant around the edge of the airbox housing gasket to help when inserting the MAF. Installation is the reverse of removal.

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Comments and Suggestions:
mikey Comments: Just purchased a 993 and going through my car and found the rubber hose in figure 6 missing. What is it? and should I replace immediately?
February 27, 2017
  Followup from the Pelican Staff: This is the air inlet for the secondary air injection system. Only USA cars have it. If your airbox is plugged where the hose should plug into the airbox, simply ignore the hose. If it is open, replace the hose ASAP. That will allow dirty air into the engine. - Casey at Pelican Parts  

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Page last updated: Sun 5/28/2017 03:18:02 AM