Horrible air filter
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Elder User
Joined: Jun 2003
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From: Bay Area, CA
Horrible air filter
The guy I go the truck said it was just changed to a K&N, so I let it go. Today 9 months later, I pull it out and its in such bad shape. There is so much road grime and grease like crap in there with a few nuts from the trees I guess. Well, Im going to get a paper filter this time, Ive heard bad things about the K&N. What is the sensor in the box? That thing was completely covered! Also The box has a broken tap, fortunatly there is nothing on the other side of the filter. Now I have a early 99, so what are my options? Can I get the newer filter box as a direct bolt in?
Senior User
Joined: Jul 2003
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From: New Jersey
I had a problem with a K&N and a early 99 also. Part of the problem is that the stock airbox pulls air off the driver's side front wheel well. I can remember changing paper filters every time i pulled my trailer when it was raining. I then switched to a K&N. Some where in the process of driving 130k miles, some of the tabs broke off and the top of the airbox was only held on by one plastic tab and the two metal retainers. At about 125K miles i took the truck into Ford to have them replace a couple of injectors and they discovered the broken airbox and decided to check the compressor blades on the turbo. Apparently crap had gotten past the filter and did some damage on the turbo. I had them replace the old airbox with one of the Ford AIS airboxes (direct bolt in). It cost me almost $ 300 but i am very satisified. If you don't like your airbox, you might try an AIS airbox or later model airbox. OR, you could try a cold air intake airbox.
I like the AIS airbox because of the increased filtering capacity and quality and it sucks air from near the radiator like in the 99.5 and later 7.3L diesels.
I like the AIS airbox because of the increased filtering capacity and quality and it sucks air from near the radiator like in the 99.5 and later 7.3L diesels.
Fleet Owner
Joined: Jun 2004
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From: Rio Rico, AZ.
Here's the link to the 6637 Napa filter mod:https://www.ford-trucks.com/forums/s...d.php?t=277571
Posting Guru
Joined: Dec 2003
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From: South Texas Coast
Also consider Tymar it is paper element open filter that replacs OEM box completely $109.
Kwik has a home made version that also works well, so I hear.
Kwik has a home made version that also works well, so I hear.
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Fleet Owner
Joined: Jun 2004
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From: Rio Rico, AZ.
Originally Posted by Phydeaux88
Also consider Tymar it is paper element open filter that replacs OEM box completely $109.
Kwik has a home made version that also works well, so I hear.
Kwik has a home made version that also works well, so I hear.
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Posting Guru
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From: South Texas Coast
Kwikk I just looked at the NAPA 6637 filter at the link you posted above. It looks very much like the Donaldson used by Tymar. How does it compare in use? Will it replace the Donaldson without having to modify the flange?
Fleet Owner
Joined: Jun 2004
Posts: 25,090
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From: Rio Rico, AZ.
Originally Posted by Phydeaux88
Kwikk I just looked at the NAPA 6637 filter at the link you posted above. It looks very much like the Donaldson used by Tymar. How does it compare in use? Will it replace the Donaldson without having to modify the flange?
Lead Driver
Joined: Jun 2003
Posts: 8,298
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From: Damon (South East Texas)
The NAPA and Donaldson filters are basically the same, just different vendors. I use the Luberfiner version of the same filter. It is the same as the Donaldson and came with a sticker on the element showing it had the same Microlite* paper. I feel it is just as good as the Donaldson. I get mine from my diesel truck part supplier at the company I work for.
Last edited by mueckster; Feb 28, 2005 at 07:25 AM.
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