Proof #325803 that K&N filters on a Powerstroke is bad - Page 2 - Diesel Forum -
'99 & up Upgrades and Aftermarket - 7.3L Engine Upgrading or adding OEM or aftermarket equipment to your 1999-Up Super Duty or Excursion with 7.3L Power Stroke diesel engine. Please confine discussion of topics in this forum to those items that are specific to the 7.3L Power Stroke engine.

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post #16 of 20 (permalink) Old 11-02-2010, 10:22 PM
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Big K&N conical on mine without any problems.

I am curious about the 'newfound turbo whistle' comment. If your truck was not making that noise with the k&n, than that bad boy was so clogged up it may have sucked some particles through and ANY filter will do that. Engine sucks on a clogged filter long enough, **** will get through it

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post #17 of 20 (permalink) Old 11-03-2010, 05:28 PM
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Originally Posted by cdacaraudio View Post
and what is the "Right way" to install a drop in filter
(Warning ! - Do not try this unless you are qualified to replace your own air filter.)

1) Insert new /oiled filter into bottom/stationary air box being careful to line up rectangular air filter. It only fits one way with the screen facing up.

2) The rubber seal on the filter must contact both the bottom part of the box and the lid when it's closed

3) Push the 2 tabs of the lid near the driver's fender in tight and clamp the lid down.

*Note : If does not fit right or dust is seen past the rubber seal, then it's not working. Repeat step 1 or seek qualified assistance.

Maybe this could be a FAQ?

Perhaps it is an issue with high boost and bigger turbos. Hmmm.

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post #18 of 20 (permalink) Old 11-15-2010, 06:22 PM
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mine looked like that, I did the CCV mod and added the AFE XR and its nice and clean. The filter has about 75k to 90k miles on it now. I noticed today that the filter was sucked in. I called AFE and they are sending a new filter and some other parts that are worn due to age. The system was put on in 03.

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post #19 of 20 (permalink) Old 11-16-2010, 10:34 PM
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Very LARGE miss conception about K&N's. A lot of people say that they let particles though and they will errode the compressor wheel. And others say well the oil collects in the ducting. Well my friends, the simple fact is, if the filter is cleaned and re-oiled CORRECTLY you will have no problems.
I had a K&N on my old 7.3 for 10 years and 160,000 miles, I live in El Paso where we have dust storms on a fairly regular occasion. I cleaned it and oiled it every oil change, I had zero problems with it.
Cleaning correctly and oiling correctly is very easy, (not trying to sound like a jerk) but read the instructions on the box. Over oiling as well as under oiling can cause issues. Along with improper cleaning. Biggest thing is making sure that the cotton in the filter is completely dry before oiling, and whatever you do, do not use compressed air to dry it, you will make weak spots in the cotton that will then tear and let dust through.

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post #20 of 20 (permalink) Old 10-01-2016, 02:34 AM
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I believe could be other issues other than K & N. I've ran a K & N over 300,000 miles with no issues. I do have a spare to rotate out when cleaning is needed, so I don't have to wait and can clean when time permits.
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  Diesel Forum - > 1999-2007 Ford Super Duties > '99 & up Upgrades and Aftermarket - 7.3L Engine

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