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Non-Varioram MAF Sensor Replacement
 
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Pelican Technical Article:

Non-Varioram MAF Sensor Replacement

Time:

1 hour1 hr

Tab:

$65 to $150

Talent:

**

Tools:

Long Philips head screwdriver, 10mm wrench

Applicable Models:

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

Parts Required:

MAF sensor

Hot Tip:

Do not use oiled filters

Performance Gain:

Better mileage

Complementary Modification:

Replace air filter

The mass air flow sensor (MAF) is used to measure the amount and temperature of air that is entering the engine at any one time. The mass air flow sensor senses the total amount of air passing the sensor and allows the fuel injection system to adjust the fuel mixture to compensate for cold weather and/or high altitude conditions.

The first indicator that you might have a problem with the MAF is the presence of a check engine light (CEL) on your dashboard. The check engine lamp can be caused by a wide variety of problems with the engine: you need to read the codes from the computer to get a starting clue as to what the problem is. However, the engine will not be operating at peak efficiency, and you will most likely experience a loss in power and a decrease in gas mileage as a result. It's best to get the problem taken care of relatively quickly, as running the engine in this condition can potentially cause damage to other components like the catalytic converters.

Vacuum leaks and other air leaks in the system can cause MAF sensor errors. If you have leaks in your air intake downstream of the sensor, then the MAF will be sensing less air than the engine is actually receiving. You should carefully inspect all of your hoses, clamps and intake tubes for air leaks prior to replacing the sensor.

The MAF sensor is located at the front of the engine just to the right side (red arrow).
Figure 1

The MAF sensor is located at the front of the engine just to the right side (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.

Disconnect the wiring connection for the MAF by rotating it counter-clockwise and pulling it off (red arrow).
Figure 3

Disconnect the wiring connection for the MAF by rotating it counter-clockwise and pulling it off (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 (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).

Use a long shaft Philips head screwdriver and loosen the clamp holding the MAF to the intake elbow (red arrow).
Figure 5

Use a long shaft Philips head screwdriver and loosen the clamp holding the MAF to the intake elbow (red arrow).

There are two clips that hold the MAF housing to the air box housing (red arrows).
Figure 6

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

Lift the airbox up and off the spud that it sits on (red arrow) and move it slightly to the right.
Figure 7

Lift the airbox up and off the spud that it sits on (red arrow) and move it slightly to the right. This will give you enough room to remove the MAF housing.

With the housing and airbox out of the vehicle you can see how the MAF clips to the box (red arrows).
Figure 8

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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Page last updated: Fri 12/9/2016 03:06:51 AM