K&N Filter and Ford Service Bulletin ? - Ford Powerstroke Diesel Forum
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post #1 of 12 Old 12-22-2012, 08:50 AM Thread Starter
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K&N Filter and Ford Service Bulletin ?

My truck is in the shop because it was randomly blowing white smoke, had a high pitch screech with backing off the throttle, was getting about 9 mpg and had exhaust in the cab.

They say it's a bad crack in the Y tube and something else that I don't remember because he also said that Ford had issued a service bulletin about CARB approved K&N filter systems contributing to white smoke problems.

So I get to thinking about this and call BS. The air/fuel ratio does not change because of a filter or intake mod unless something else isn't working right. The only thing I could think of (provided everything is functioning correctly) is that maybe the upper limit of the air flow sensor is below that of what the intake is now providing.

Any of you Ford Mechs know anything about this. Of course the service tech is recommending that I put the stock intake and filter back on after they fix all the other problems but they also know that I'm not voiding my warranty by staying with the K&N.

Thanks for any info you guy's can provide.

Steve Schefer
Santa Rosa, Ca

08' F350 Super Duty 4x4 OffRoad. 6.4l, Fabtech 6" lift, Procomp 20" wheels/Toyo 37's, K&N Intake. 9" total over stock lift.
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post #2 of 12 Old 12-22-2012, 10:22 PM
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Well, k&n is one of the worst filtering filters for our trucks.. The worst! They let so much dirt/ debris through compared to s&b and afe filters. Idk about the other information mentioned but I do know that about k&n filters for our turbo Diesel engines.


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post #3 of 12 Old 12-23-2012, 05:14 AM
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Quote:
Originally Posted by mts678 View Post
Well, k&n is one of the worst filtering filters for our trucks.. The worst! They let so much dirt/ debris through compared to s&b and afe filters. Idk about the other information mentioned but I do know that about k&n filters for our turbo Diesel engines.AutoGuide.com App[/color]
About K&N filters, I've never heard this before. How does a company go from number one in filtering to last as SB and AFE have taken over? Hmm...I wonder...

Spartan'd, 4" ICON Stage II, 35" Duratracs, XPD additive and M1 full synthetic
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post #4 of 12 Old 12-23-2012, 05:16 AM
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K&n is the worst i bought one and put my stock filter back on after 15 thousand miles do it it eating my compressor wheel...


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post #5 of 12 Old 12-23-2012, 05:34 AM
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Yea do about five mins of searching on here you will learn why k an n gets a big thumbs down


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2000 f-350 4x4 extended cab, went from a flatbed work truck to what you see now, all done by me. Early 99 engine, heavy duty low stall converter, rebuilt trans, all new uvch, rebuilt injectors, all new icp, idm, cps, hutch mod, k&n intake, white valve covers, wicked wheel, 5 inch exhaust, php hydra chip 15pos, 16 inch bullet hole rims painted gloss black, 33x10 wild country mtx, lowered the back level
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post #6 of 12 Old 12-23-2012, 05:43 AM
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I'll definitely check it out...I've got AFE setup, so I'm not overly concerned (unless it has a KN filter on it), but I honestly thought that KN had a good rep for their products.

I guess they went from a quality race product to the equivalent of a FRAM in what, 10-15 years?

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post #7 of 12 Old 12-23-2012, 06:02 AM
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K&N completely denies the claims on their website

but keep in mind this can void your warranty if ford wants to prove that the filter caused the issue

but I will never run one again I had two identical intakes and the one running the K&N
was dusty past the filter and dusted the MAF sensor

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post #8 of 12 Old 12-23-2012, 06:59 AM
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AFE part number

I have a K&N intake, Does anyone have a part number for an AFE filter to replace my K&N. I would like to replace just the filter if possible.
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post #9 of 12 Old 12-23-2012, 07:59 AM
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I use the K&N drop in filter..no intake mod. My dealer has never mentioned anything.
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post #10 of 12 Old 12-24-2012, 09:43 PM
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Quote:
Originally Posted by Danno1961 View Post
I have a K&N intake, Does anyone have a part number for an AFE filter to replace my K&N. I would like to replace just the filter if possible.
I don't have it on hand. But get on performance truck products website and enter in ur truck info and you'll see the filters. Depends on what intake you have, what size the hole is, ect. You just need to make sure the inside diameter if the filter hole that slips on the intake Tube is the same.


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Marshall
2000 F250 7.3L CCSB 2WD
Tinted | Focal speakers & 12" Kicker | CTS Edge Insight | Wicked Wheel | 6 pos chip | 05 grill & lights | 08 mirrors & tailgate | EBVP delete | 08 console | Nathan P3 train horns & Onboard Air
Switching to hid's? Do it right!

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