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Engine Air Filter Replacement
 
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Pelican Technical Article:

Engine Air Filter Replacement

Steve Vernon

Time:

30 minutes30 mins

Tab:

$20 to $100

Talent:

*

Tools:

Hands

Applicable Models:

Porsche 993 Carrera (1995-98)
Porsche 993 Carrera 4 (1995-98)
Porsche 993 Carrera 4S (1996-98)
Porsche 993 Carrera S (1998)
Porsche 993 Targa (1996-98)
Porsche 993 Turbo (1996-97)

Parts Required:

Air Filter

Hot Tip:

Do not use oiled filters

Performance Gain:

Cleaner engine

Complementary Modification:

Replace cabin air filter

Every 10,000 miles or so, you should change the engine air filter in your Porsche 993 and more often if you drive on a lot of unpaved roads or live in a dusty or desert environment. The air filters protect the air intake system, valves, pistons, cylinder walls, and engine oil from dust and debris that can be sucked in under normal operation. Replacement is a snap and should only take 30 minutes or so.

Air filters are like oil in that you will no doubt hear discussions on the different types of air filters used in vehicles. There are basically two different types of air filters: the stock paper or cloth air filters and aftermarket units. These aftermarket units utilize an oil-soaked fabric to achieve freer air flow. While this may sound good, many aftermarket filters also do not filter as well as the stock units, in addition the oil can damage the MAF. The various horsepower claims of some aftermarket filters are somewhat suspect. The primary advantage of the aftermarket units is that you usually only have to purchase one, and it will last the life of your car. The bottom line is to carefully research any aftermarket filter before you install it to your car. Make sure that it filters as well or better than the original Porsche specifications for your year car.

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 from the bell housing connected to it by the air opening (red arrow).
Figure 2

If your car has a manual transmission there is a rubber hose from the bell housing connected to it 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.
Figure 4

Begin by releasing the two clips for the air box lid (red arrows) and remove the lid.

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).

If you have a standard transmission 993 and your filter looks like this you are going to have a clutch job in the very near future.
Figure 6

If you have a standard transmission 993 and your filter looks like this you are going to have a clutch job in the very near future. All of this brown evenly distributed dust is actually clutch material that is from the bell housing breather tube and is a sign of severe clutch wear.

Make sure to inspect the inside of the air filter housing for dirt and debris and give it a good wipe down, there is no point putting a clean filter into a dirty housing.
Figure 7

Make sure to inspect the inside of the air filter housing for dirt and debris and give it a good wipe down, there is no point putting a clean filter into a dirty housing. Also look for any oil from the MAF opening as this can be a sign of trouble with the motor. Installation is the reverse of removal.

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