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Old 04-06-2008, 04:58 AM   #1
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Air Filter condition

My air filter looks dirty on the foam side but the pleated paper side looks clean. Almost brand new. I changed my filter but did I need to? I guess the fact that the pleated side is so clean means the filter is doing a great job. I used to the old 1970's style filters where you had pleated paper on both sides and I guess that's why I thought the paper side should be dirty before changing it. Let me know what are opinions are. Thanks

Dirty foam side. Air enters here

Clean pleated side. Air exits here to engine intake

http://i25.tinypic.com/20aq3wn.jpg http://i26.tinypic.com/2zguetx.jpg http://i28.tinypic.com/2jdi1ok.jpg
2000 Boxster S: 18" Turbo wheels w/color crests, Litronics, Onboard Computer, Traction control, Cruise, Painted rollbar, Leather interior, Aluminum package, headlight washers, Porsche GT3 seats, windstop, Hi Fi six speaker amp package, DSP, CDR 220, Limited Slip, side airbags, BK Rollbar extender.
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Old 04-06-2008, 07:35 AM   #2
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Doesn't look too bad. I've seen much worse. The pleated side is the clean side and should always look perfect. No dirt ever. If you are chasing a CEL 1128, 1130, changing the air filter and cleaning/replacing the MAF are a good first step. Also look for loose vacuum lines around your intake between the MAF and intake manifold.
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Old 04-06-2008, 08:38 AM   #3
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Especially when compared to the price of Fuel these days, Filters are cheap. Not recommended that you try to pinch pennies here.

The more a filter filters, the better it can filter. But that also means the more restrictive it is. This can make your engine works harder and run leaner (since the DME compensates for the decreased air supply by also decreasing the Fuel supply).

In the end, this ain't the best for the motor and also negatively affects MPG. It doesn't take too much extra Fuel cost to pay for the Filter.

My recommendation is to change it sooner rather than later.

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