Can a Fram Air Filter cause P0171/P0174 codes
Cadillac
 

Cadillac Forums | Help Us Help You | Advertise | Cadillac Parts | Cadillac News | Cadillac Classifieds

Cadillac Technical Archive | Cadillac Dealers | Cadillac Reviews | Cadillac Dealer Reviews | Cadillac Vendors

CadillacForums.com is the premier Cadillac Forum on the internet. Registered Users do not see the above ads.
+ Reply to Thread
Results 1 to 11 of 11
Like Tree2Likes
  • 2 Post By dkozloski
  • 1 Post By EChas3
Cadillac STS Forum - 2005 through 2012 Discussion, Can a Fram Air Filter cause P0171/P0174 codes in Past Cadillac Vehicle Discussion; I have been having problems with the check engine light coming on, and it giving me the P1071 / P0174 ...
  1. #1
    Zman1001 is offline Cadillac Owners Member
    Join Date
    Jun 2006
    Posts
    23

    Can a Fram Air Filter cause P0171/P0174 codes

    I have been having problems with the check engine light coming on, and it giving me the P1071 / P0174 codes that the car is running lean.

    I know that one of the things is that an oiled air filter can cause an oil buildup on the Mass Air Flow sensor.

    Is the Fram air filter oiled? Could the Fram air filter be causing this problem?

    Thanks

  2. Remove Advertisements
    CadillacForums.com
    Advertisements
     

  3. #2
    dkozloski's Avatar
    dkozloski is offline Cadillac Owners 10000+ Posts
    Automobile(s): 2006 STS V8 AWD, '95 Ford Ranger
    Join Date
    Jul 2004
    Location
    Fairbanks, Ak
    Age
    75
    Posts
    27,633

    Re: Can a Fram Air Filter cause P0171/P0174 codes

    Check to make sure you reconnected the PCV line when you installed the filter.
    Don't mess with Binky Bear!


  4. #3
    chazglenn3's Avatar
    chazglenn3 is offline Cadillac Owners Connoisseur
    Automobile(s): 2005 White Diamond STS N* 1SF RWD ACC/HUD
    Join Date
    Sep 2004
    Location
    Tacoma, WA
    Age
    52
    Posts
    1,928

    Re: Can a Fram Air Filter cause P0171/P0174 codes

    Fram air filters are not oiled.

  5. #4
    Zman1001 is offline Cadillac Owners Member
    Join Date
    Jun 2006
    Posts
    23
    Thread Starter

    Re: Can a Fram Air Filter cause P0171/P0174 codes

    Thanks for the responses. I did not think that the FRAM was oiled, but since that is one of the possible symptoms is an oiled air filter causing buildup on the MAF sensor. Dealing with a 2008 STS

    I am officially above my head now. I never knew that changing an air filter would be so difficult. When I changed the air filter, I unscrewed the bolts, took out the old air filter (which looked identical to the new one, but not sure what brand), put in new one, then put screws back in. I did not see any other connections, and not sure exactly what PCV line is:

    A little more background.

    I have had the check engine light come on a few times, but would go out again. Just when I was going to take it to the dealer, we had an ignition coil go bad. Got replaced. The three days later the light came back on. Had the vacuum hose replaced. light came back on next day after getting back.

    It is now with them again and they have recently replaced the MAF sensor, but their tests are still coming up that it is running lean.

    One of the things on the checklist is that some aftermarket air filters could cause this problem. Not sure the air filter is the problem as some time had passed, but wanted to see if anyone else had run into this problem

    That is why I was asking the question.

    Thanks again.

  6. #5
    dkozloski's Avatar
    dkozloski is offline Cadillac Owners 10000+ Posts
    Automobile(s): 2006 STS V8 AWD, '95 Ford Ranger
    Join Date
    Jul 2004
    Location
    Fairbanks, Ak
    Age
    75
    Posts
    27,633

    Re: Can a Fram Air Filter cause P0171/P0174 codes

    The big rubber/plastic hose between the air filter and the throttle body has a connection about midway that goes to the PCV connection on the left valve cover. It's easy to overlook but a blind man could reconnect it. If left loose it will cause several different codes.
    Jesda and Jesda like this.
    Don't mess with Binky Bear!


  7. #6
    ddalder's Avatar
    ddalder is online now Cadillac Owners Connoisseur
    Automobile(s): 2008 STS-4 N* 1SG
    Join Date
    Aug 2008
    Location
    Canada
    Posts
    2,256

    Re: Can a Fram Air Filter cause P0171/P0174 codes

    If you purchased a Fram ToughGard filter, it is oiled. Most people don't buy these ones. Depsite this, I agree with koz. This sure sounds like there is unmetered air getting in the system. Check all the connections from the air box back, including any vacuum lines.

  8. #7
    EChas3's Avatar
    EChas3 is offline Cadillac Owners Master
    Automobile(s): 2006 STS4 V8 1SG & 2007 STS V8 1SE
    Join Date
    Jun 2008
    Location
    Cedarburg, WI
    Age
    57
    Posts
    7,758

    Re: Can a Fram Air Filter cause P0171/P0174 codes

    N*? Could this be another set of loose intake manifold bolts?
    Tom's Caddy likes this.

  9. #8
    Zman1001 is offline Cadillac Owners Member
    Join Date
    Jun 2006
    Posts
    23
    Thread Starter

    Re: Can a Fram Air Filter cause P0171/P0174 codes

    Thanks everyone. It was just the Fram Extra Guard filter.

    I will let everyone know what it is. My car has been at the dealer for over one week now trying to figure this latest one out. The reason I posted this question is because they called me asking about the filter. Again, their check list that they are going down says that after market air filters could cause the "lean" codes, and they called me.

    I will let you know what finally comes back, since they already replaced the MAF sensor and it is still showing it running lean.

  10. #9
    REALTORBENJAMIN's Avatar
    REALTORBENJAMIN is offline Cadillac Owners Fanatic
    Join Date
    Dec 2012
    Posts
    275

    Re: Can a Fram Air Filter cause P0171/P0174 codes

    Quote Originally Posted by Zman1001 View Post
    Thanks everyone. It was just the Fram Extra Guard filter.

    I will let everyone know what it is. My car has been at the dealer for over one week now trying to figure this latest one out. The reason I posted this question is because they called me asking about the filter. Again, their check list that they are going down says that after market air filters could cause the "lean" codes, and they called me.

    I will let you know what finally comes back, since they already replaced the MAF sensor and it is still showing it running lean.
    Ever get sorted? Thinking of ditching my KnN filter and putting a regular one in to see if that increases my MPG. I am averaging up to 19L/100km right now = 12 MPG?

  11. #10
    Submariner409's Avatar
    Submariner409 is offline If it won't run, stick on fender vents
    Automobile(s): 2002.5 F55 STS, 2004 F150 SuperCab 4x4
    Join Date
    Feb 2006
    Location
    MD Eastern Shore
    Age
    75
    Posts
    49,835

    Re: Can a Fram Air Filter cause P0171/P0174 codes

    ALL pleated paper air filters have some tiny amount of "oil" in them. It's part of the paper forming/pleating process. Smell one. NONE of the commercially available pleated paper air filters has enough "oil" in it to damage anything.

    K&N filters, if the wash and oil type, are typically abused by the owners because, as with all hype and snake oil, if a little is good, more must be better. We decode and replace quite a few MAF sensors of different types due to K&N zealots screwing things up with that damned "filter oil". (Marvel Mystery Oil - a few drops - works just fine. Let it spread through the media for 3 days.)

    For any vehicle with a divorced MAF and air ducting clamped to the filter box/throttlebody, any clamp left loose, and sensor or PCV line left open/unplugged, any rip in the intake ducting causes lean mixture codes.

    For example, in this picture, any air leak at or after the MAF WILL set lean codes. Ask me how I know.

    Actually, FRAM makes damn good air filters. Their oil filters, however, leave something to be desired. I happen to be partial to WIX filters.

  12. #11
    Midnight is online now Cadillac Owners Fanatic
    Automobile(s): 2005 STS 1SG
    Join Date
    Nov 2009
    Location
    Baltimore
    Age
    40
    Posts
    291

    Re: Can a Fram Air Filter cause P0171/P0174 codes

    My 2005 STS N* had an issue with the MAF sensor, although I'm sorry I don't remember the exact codes, it's been a couple years.

    It was an intermittent problem and I actually bought a new MAF sensor, which is surprisingly not too expensive, thinking that would solve it, but it didn't. From there, I hooked my code reader which has some live output (one of which is the MAF sensor value). With the car running I was able to reproduce the problem when wiggling the MAF sensor harness' wires.

    On inspection it looked like the wire had a spiral cut in the insulation and the wire itself, at a similar pitch to the wrapped "tape" that bundles up and protects the wires. I don't know if this taping is done at the factory by a robot or by hand, but my theory is somehow it was done wrong and weakened the wire and over the years it fatigued and separated internally.

    Anyway, I just cut and spliced and re-taped and no more problems.

    So something to definitely check especially if this was some kind of manufacturing problem.

    good luck.

Quick Reply Quick Reply

Register Now

Please enter the name by which you would like to log-in and be known on this site.

Please enter a password for your user account. Note that passwords are case-sensitive.

Please enter a valid email address for yourself.

What Cadillac(s) do you own? (Or type NONE)

Please select your insurance company (Optional)

Your date of birth and age are displayed in several places on the forum. Only the administrator will have access to your date of birth should you choose to hide it via the privacy option below.

Log-in

Human Verification

In order to verify that you are a human and not a spam bot, please enter the answer into the following box below based on the instructions contained in the graphic.



Bookmarks

Cadillac Posting Rules

  • You may post new threads
  • You may post replies
  • You may not post attachments
  • You may not edit your posts
Read about Lincoln | Buick | Kia Forte Forum
Need products for your Cadillac? Check out your options at the links below:

custom floor mats | Cadillac Chrome and Black Chrome Wheels | window tinting