
01 Jul 2004, 03:49 pm
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Fanatic Cruiser
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Join Date: Oct 2001
Location: Los Angeles, California, USA.
Posts: 543
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Believe it or not, the jury is still out on the benefits of using a "performance filter". Paper vs cotton gauze vs foam air filters is a debate that has been going on for years. The paper guys state, isn't an air filters job to remove as many particles as possible BEFORE it gets into your engine?, and any performance improvements from other filter designs are so minor you won't notice them anyways. The cotton gauze camp states their filters flow better than paper and "filter up to 99% of paper" and is reusable. And the foam fans state, if cotton gauze filters so good then why do those companies offer foam pre-filters as extra cost options?, then you might as well buy a foam filter and get the extra filtration and increased air flow and is also reusable. Many criticize that reusable filters work well in some applications but not in others, so consistency/repeatable results is in question. But why are there so many TSB's warning about the use of cotton gauze and foam filters that need or use tactified oil that may migrated and collect on and damage your mass air sensor? For example:
Quote:
quote:The following is a memo from GM stating the use of rechargeable air filters may cause transmission shift problems, engine driveability problems & SES Light On problems (throwing codes). It also states these problems will NOT be covered under warranty. Yes, in part of the memo, it states "excessively oiled" filters. But for the most part, it reads any use of this type of filter & these issues won't be covered.
quote:
SERVICE - ALL BUICK, CADILLAC, CHEVROLET, GMC TRUCK, ISUZU, OLDSMOBILE, PONTIAC AND HUMMER DEALERS
Subject: A/T Shift, Engine Driveability Concerns or SES Light On as a Result of the Installation of an Aftermarket Reusable, Excessively Oiled Air Filter -- 2004 and Prior Cars and Lt Duty Trucks and 2003-2004 HUMMER H2
Message #: VSS20040056
Corporate Bulletin Number 04-07-30-013 will be available in SI on March 18, 2004.
Automatic Transmission Shift, Engine Driveability Concerns or Service Engine Soon (SES)
Light On as a Result of the Installation of an Aftermarket Reusable, Excessively Oiled Air Filter
Models: 2004 and All Prior Cars and Light Duty Trucks
2003-2004 HUMMER H2
DO THIS
First, Inspect the vehicle for a reusable aftermarket excessively oiled air filter
DON'T DO THIS
DO NOT repair under warranty if concerns result from the use of a reusable aftermarket oiled air filter.
The installation of an aftermarket reusable, oiled air filter may result in:
1. Service Engine Soon (SES) Light On
2. Transmission shift concerns, slipping and damaged clutch(es) or band(s)
3. Engine driveability concerns, poor acceleration from a stop, limited engine RPM range
The oil that is used on these air filter elements may be transferred onto the Mass Air Flow (MAF) sensor causing contamination of the sensor. As a result, the Grams per Second (GPS) signal from the MAF may be low and any or all of the concerns listed above may occur.
When servicing a vehicle with any of these concerns, be sure to check for the presence of an aftermarket reusable, excessively oiled air filter. The MAF, GPS reading should be compared to a like vehicle with a OEM air box and filter under the same driving conditions to verify the concern.
Transmission or engine driveability concerns that are the result of the installation of an aftermarket reusable, excessively oiled air filter are not considered to be warrantable repair items.
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Then there was one person that actually had his entire stock air box flow tested and found that the air filter had no effect on the air flow and any restrictions were because of the OEM airbox design.
http://theoildrop.server101.com/ubb/...;f=15;t=000215
Can go here and read or search posts:
http://theoildrop.server101.com/ubb/...ubb=forum;f=15
Air filter
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