Materials to Maintain Your ZHP IIIII Hand Protection IIIII Tools to Maintain Your ZHP
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  1. #11
    Join Date
    Mar 2011
    Location
    Beaverton, OR
    Posts
    979
    I've had my K&N CAI for almost 3 years, never had any issues...other than abstaining from pressing the loud pedal. I've never washed, cleaned or oiled it, which may not be great, but it's still "relatively" pink. Plus, the oil can damage the MAF and throw codes if it's on there a bit too thick, so I decided to just not oil it. It does come pre-oiled out of the box. I do however take the MAF off and clean it about once a year, literally spray the shit out of it with some CRC MAF cleaner. Do it 5-6 times, letting it dry for a min or so in between sprays, all good after that. I can't imagine that the non K&N filter you have is causing any issues, but I suppose it's possible? Either way, you posted that link to the correct K&N filter for this CAI, which you can probably pick up at your local Autozone. It's a bit bigger, and frankly, it just looks better



    2016 BMW M340i


    BMW CCA Member . Dinan Stage 1 Software . Dinan 3.5" Exhaust . Dinan CAI & Turbo Inlet . VSRF Charge Pipe . H&R Sport Springs . CF: Front Splitter, Rear Valance, Trunk Spoiler, Roof Spoiler, M3 Mirror Covers . BMW Performance pedals . Gloss black ///M kidneys . 12mm F / 15mm R BMS Spacers. NGK 94201 Plugs .

    2013 BMW X5 M-Sport - Sold
    2009 550i M-Sport - Sold
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  2. #12
    Join Date
    May 2016
    Location
    Pekin, Illinois
    Posts
    132
    Thanks for the post, I have an offer to send an Airbox, I just need to pay freight. I may also pick up the K&N filter as well. I just did a 4.5 Hour trip and avoided 75 MPH, which is where the car has thrown the code. I went 65-70 and then cruised at 80 MPH. I think there may be some validity with the resonant issue with the filter.


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  3. #13
    Wow, super interesting you wrote this yesterday. Today I went to get the airbag recall on my 04 ZHP (dealer is 40 min away 90% highway). I was going 75-80 mph most of the time and on the way back got the same two codes. I have the Injen SRI. I've replaced most of the common vacuum leaks since I've owned it.

    Ive had no issue for the month that I've had it installed but my daily commute only gets me up to 65 mph, maybe.

    ¯\_(ツ)_/¯


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  4. #14
    Join Date
    May 2016
    Location
    Pekin, Illinois
    Posts
    132
    Well, I will say that I am going to call K&N on Monday. As mentioned in my first post, everything looks fine at idle and at 3000 RPM on the Snap-On scanner. Apparently turbulence causes issues with the MAF properly metering the flow.


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  5. #15
    Join Date
    Dec 2016
    Location
    Boston, MA
    Posts
    643
    Quote Originally Posted by roadbiker_2 View Post
    This is what is on the car.
    I know a lot of people who would tell you this is the problem; At 70+mph, you're getting a ram-air effect, where the engine is no longer drawing air in by itself because the high pressure area in front of the radiator is cramming 70mph air into the funnel and blowing it into the side of the air filter. The air becomes turbulent to the point that it screws with the MAF's signal to the ECU and throws a code (or two.) Considering that you said you only get the codes when driving at 75-80mph, I'd say this is a strong candidate for the cause.
    Name:  K&N.jpg
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    You might be able to remedy this by fabricating a baffle something like this (you could test the theory with a piece of cardboard or something taped there temporarily) so the air is no longer blowing directly at the inlet.
    Name:  K&N-1.jpg
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    I'm not a fan of these CAI's because they defeat the purpose of the sealed air box which BMW designed to take advantage of the ram air effect, unlike the K&N setup where air can escape around the sides of the incomplete box.

    The other thing you could do is swap in your old box (if you still have it) or borrow one for a day and see if that fixes the problem. Or borrow someone's MAF... Process of elimination. That's what mechanics will do until they find the problem, which can get expensive.

    Good luck... Keep us posted with your results for future reference.

  6. #16
    Join Date
    May 2016
    Location
    Pekin, Illinois
    Posts
    132
    Well, I did have an offer for a free box from someone earlier, still working out details on that. I happen to have the luxury of having not one, but two ZHP's (Tongue in Cheek), which means I have all of the above. I also have all of the above for maintenance issues as well, Cold weather CCV, DISA, VANOS, etc. Maybe two of things can mean a whole lot of maintenance . . . I'm getting caught up, but my sons car really threw some cold water on getting the other ZHP done.


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  7. #17
    Join Date
    Jan 2014
    Location
    SoCal
    Posts
    146
    I had a few problems with my K&N as well. About 6 months ago I kept getting a code that would magically disappear by the time I got to my local indie. Turns out that I had a vacuum leak at the F-connector that plugs into the Intake. It wasn't much and took high RPM's for it to reappear. A quick change of the rubber grommet and all was good again.
    Other problems included oil getting on MAF sensor and more recently my filter kept falling off. I tried new clamps but it still kept happening so I am back to stock for now... I do miss the sound tho...

  8. #18
    Join Date
    Jan 1970
    Location
    Southern California
    Posts
    18,064
    That's a bummer. Love the extra sound.

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    Randeaux/Rando/John/jr - '06 Cic ZHP; Southern California
    "ZHP or not, I still like you"


    ZHP Performance Package, Cold Weather Package, Leather, Jet Black/Black/BlackCube, NAV, Anthracite Black "my individual" interior trim
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  9. #19
    Quote Originally Posted by roadbiker_2 View Post
    Well, I did have an offer for a free box from someone earlier, still working out details on that. I happen to have the luxury of having not one, but two ZHP's (Tongue in Cheek), which means I have all of the above. I also have all of the above for maintenance issues as well, Cold weather CCV, DISA, VANOS, etc. Maybe two of things can mean a whole lot of maintenance . . . I'm getting caught up, but my sons car really threw some cold water on getting the other ZHP done.


    Sent from my iPhone using Tapatalk
    Roadbiker, Did you ever solve the issue?

    I was having both p0171/p0174 codes at highway speeds and I believe a new fuel pump has solved my issue. Mine was original (150k miles).
    I've had the new pump for 9 days and the code has not shown up yet (knock on wood).
    I'll update this if something changes.


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  10. #20
    Join Date
    May 2016
    Location
    Pekin, Illinois
    Posts
    132
    I have the Airbox, but the car is with my son in college. He will be home for Spring Break in about two weeks. I have determined that the intermittent SES light, with codes P0174 and P0171 in this order, were the result of turbulent flow into the MAF at highway speeds. Specifically at 75 MPH. The SES light has not throw for almost a month now with him driving regularly around Milwaukee, as well as the 4.0 hour drive to take the car up to him. I stayed away from from 75 on the highway, and it never showed up.

    As the car currently has a K&N Cold Air Intake on it now, I will need to reuse the upper Intake rubber I just replaced on the wife's car to do a quick road test once it is home. It was throwing the P0174 and P0171 codes roughly every 30 miles if you put the cruise on at 75 MPH.


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