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Air Box and Air Flow Sensor Removal
 
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Pelican Technical Article:

Air Box and Air Flow Sensor Removal

Steve Vernon

Time:

1 hour1 hr

Tab:

$500 to $1,200

Talent:

**

Tools:

17mm wrench, 5mm Allen, flathead screwdriver

Applicable Models:

Porsche 944 Turbo (1986-89)

Parts Required:

New air box or air flow meter

Hot Tip:

Wipe down the inside of the airbox

Performance Gain:

Proper running motor

Complementary Modification:

Change cabin air filter

The air box and air flow meter are attached and best worked on with them out of the car. You will also need to remove them to perform several projects on the front of the motor. Most air boxes on these cars have been damaged over the years and glued or bolted back together with all different types of fasteners. Do not be surprised if your air box has different or missing fasteners when you go to work on it.

Begin by opening the hood and having a look at the engine.
Figure 1

Begin by opening the hood and having a look at the engine. The air box is located in front of the engine (red arrow) with a cold air intake running to the left front fender area (yellow arrow). The air flow sensor is under the lid and intake tube (green arrow).

Remove the two flathead screws connecting the air box to the intake tube (red arrows).
Figure 2

Remove the two flathead screws connecting the air box to the intake tube (red arrows).

Remove the tube by lifting it up and pulling it out from the grommet it sits in within the inner fender (red arrow).
Figure 3

Remove the tube by lifting it up and pulling it out from the grommet it sits in within the inner fender (red arrow).

Remove the three fasteners securing the air box lid to the base (red arrows).
Figure 4

Remove the three fasteners securing the air box lid to the base (red arrows).

Disconnect the line running to the turbo pipe with a 17mm wrench.
Figure 5

Disconnect the line running to the turbo pipe with a 17mm wrench. Note that there are two washers (red arrows) that need to be replaced if you remove the line.

Disconnect the clamp over the pipe by reaching down and unclipping it.
Figure 6

Disconnect the clamp over the pipe by reaching down and unclipping it. Then remove the lid. Next, use a flathead screwdriver and loosen the hose clamps on both ends of the pipe (red arrows).

Remove the pipe from the engine (red arrow).
Figure 7

Remove the pipe from the engine (red arrow).

Remove the three fasteners on the air box mounts (red arrows).
Figure 8

Remove the three fasteners on the air box mounts (red arrows).

Disconnect the wiring for the air flow sensor.
Figure 9

Disconnect the wiring for the air flow sensor. Use care when working with the connection; make sure the wire is released before removing it (red arrow). These connectors get very brittle with age. You do not want to damage it.

Use a flathead screwdriver and loosen the clamp holding the air flow sensor to the tube (red arrow).
Figure 10

Use a flathead screwdriver and loosen the clamp holding the air flow sensor to the tube (red arrow).

Slip the air box and air flow sensor back out from under the intake tube and up and out from the motor (red arrow).
Figure 11

Slip the air box and air flow sensor back out from under the intake tube and up and out from the motor (red arrow).

With the air box and air flow sensor removed you can see all the room you have to access the other components on the front of the motor.
Figure 12

With the air box and air flow sensor removed you can see all the room you have to access the other components on the front of the motor. Installation is the reverse of removal.






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