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Varioram Air Intake Temperature Sensor Replacement
 
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Pelican Technical Article:

Varioram Air Intake Temperature Sensor Replacement

Steve Vernon

Time:

30 minutes30 mins

Tab:

$30 to $60

Talent:

**

Tools:

Hands

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)

Parts Required:

Temperature sensor

Hot Tip:

Remove the airbox if your hands are too big

Performance Gain:

Proper information to the EMC

Complementary Modification:

Replace air filter

On the 993's induction system, the MAF sensor is used to determine the volume and density of the air entering the throttle body. The air temperature however is computed by a separate air temperature sensor incorporated into the air filter housing. This sensor is very important for computing the proper air to fuel ratio in the engine. If you are getting an error code for the air intake sensor, you should replace this sensor right away.

Replacement is quick and easy and if your hands are small enough, you do not need to remove the air filter box. If you cannot reach or fit your hands where the sensor is, please see our article on air box removal for additional instructions.

The air intake temperature sensor is located on the rear of the airbox just behind the Variorum actuator on Variorum engines (red arrow).
Figure 1

The air intake temperature sensor is located on the rear of the airbox just behind the Variorum actuator on Variorum engines (red arrow).

Unclip the two clips (red arrows) on the air filter housing cover (on manual transmission cars disconnect the hose as well) and remove the cover and filter.
Figure 2

Unclip the two clips (red arrows) on the air filter housing cover (on manual transmission cars disconnect the hose as well) and remove the cover and filter.

The sensor is towards the rear of the airbox housing (red arrow), unless you have large hands you should be able to reach in and work on it (it may help to remove the 10mm nut in front of it holding the wiring harness and airbox to the manifold).
Figure 3

The sensor is towards the rear of the airbox housing (red arrow), unless you have large hands you should be able to reach in and work on it (it may help to remove the 10mm nut in front of it holding the wiring harness and airbox to the manifold).

Remove the electrical connection by squeezing in on the metal clip and pulling it off the sensor (red arrow, shown on the heat temperature senor as they are the same type and you can't really get a good picture of the air temperature sensor).
Figure 4

Remove the electrical connection by squeezing in on the metal clip and pulling it off the sensor (red arrow, shown on the heat temperature senor as they are the same type and you can't really get a good picture of the air temperature sensor).

Pull the sensor from the housing, it may help if you reach into the airbox and push as well as pull.
Figure 5

Pull the sensor from the housing, it may help if you reach into the airbox and push as well as pull.

With the airbox removed from the engine you can see how the sensor just sits in a rubber grommet and is held in place by friction only (red arrow).
Figure 6

With the airbox removed from the engine you can see how the sensor just sits in a rubber grommet and is held in place by friction only (red arrow).

Pull the old sensor out, use a small amount of lubricant and install the new sensor.
Figure 7

Pull the old sensor out, use a small amount of lubricant and install the new sensor. Installation is the reverse of removal.

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