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Technical: Fender Mounted MAFs and Filters

Discussion in 'Archive' started by SteveC, Oct 28, 2003.

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  1. SteveC

    SteveC Well-Known Member

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    Some more tech info from the guys at Fordchip...

    Jerry made a post on Modular Depot about this.... I figure its worth repeating here as well especially after seeing the issues on my car.

    Most blower kits relocate the MAF and filter to inside the fenderwell. Most of the time this works OK but can be the cause of some driveability issues. We have seem some cars that had a decel stall problem or a fluctuating idle when you depress the clutch and coast while coming to a stop. My car had the issue. After looking at several cars with the same issue we figured out that its actually caused by an erratic signal at the MAF and filter caused by air passing through the filter at speed. The issue is worse in a car with no foglights since you will allow more directly at the filter and MAF vs a car with a foglight filling the hole. This could also cause cruise "bucking" and other wierd probs while driving.

    To test the solution I simply put a piece of cardboard into the fascia to act as a shield for the MAF and filter. The idle is perfect now and no more stalling. We have seen the same improvement in other cars that had the initial prob.

    This should not be an issue with cars that have CAIs since the air will most likely stabilize before getting to the MAF. I could see a similar issue with Ram-Air set-ups though.

    Turbulent air through a filter mounted right ot the MAF is never a good idea. So plan on using some sort of shield around any filter mounted in an exposed position.
     
    SteveC, Oct 28, 2003
    SteveC, Oct 28, 2003
    #1
  2. Troll

    Troll banned

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    nice info man. i cant wait till i have to even worry about that problem... get it??
     
    Troll, Feb 1, 2004
    Troll, Feb 1, 2004
    #2
  3. snakeiz919

    snakeiz919 New Member

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    I have a CAI and currently experiencing this so called "bucking". I am totally confused from it. Codes read are P1117 and P1451. Can someone help?
     
    snakeiz919, Feb 14, 2004
    snakeiz919, Feb 14, 2004
    #3
  4. Junior2561

    Junior2561 [b]Junior[/b]

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    is your MAF in the fender?
     
    Junior2561, Feb 14, 2004
    Junior2561, Feb 14, 2004
    #4
  5. snakeiz919

    snakeiz919 New Member

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    No it is not. Would you say it is the IAC valve?
     
    snakeiz919, Feb 16, 2004
    snakeiz919, Feb 16, 2004
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  6. 99stangz

    99stangz New Member

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    I think i may have the problem whn i got my Lightning MAF put on and new air filter im starting to get some bucking sometimes not all the time but it has happend. So what can i do to fix this? And i dont have foglights.
     
    99stangz, Jun 17, 2004
    99stangz, Jun 17, 2004
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  7. NewStangEnthusiast

    NewStangEnthusiast Sig: Violated

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    THAT'S what's causing that... I couldn't figure out why my car was lurching, like that. I'll have to try moving the MAF farther from the filter and see if that helps.
     
    NewStangEnthusiast, Jun 17, 2004
    NewStangEnthusiast, Jun 17, 2004
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  8. WhiteSaleen248

    WhiteSaleen248 Search And Destroy.

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    Does this happen with the Vortech Kit aswell? just checking for any troubleshooting for the near future.
     
    WhiteSaleen248, Jun 17, 2004
    WhiteSaleen248, Jun 17, 2004
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  9. lbjerryh

    lbjerryh New Member

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    I have a fenderwell air filter and my car is "lurching" or bucking. Could this be my problem????
     
    lbjerryh, Apr 15, 2005
    lbjerryh, Apr 15, 2005
    #9
  10. Mustang71Lover

    Mustang71Lover Fastest Kia in Arizona

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    When Mounting a 90mm Lightning MAF with an aftermarket Ebay CAI, do you need a new intake tube to connect it to the fenderwell. I know it's a four bolt design, but wethere its the stock mustang MAF or the Lightning MAF, is that four-bolt the same size?
     
    Mustang71Lover, Apr 19, 2005
    Mustang71Lover, Apr 19, 2005
    #10
  11. emoney8924

    emoney8924 BOOOOST

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    i just installed my paxton novi 1000 it requires you to mount the maf and filter in the fenderwell, i have a really bad buck to it, feels like fuel cut, but ill def. have to try this out, if it works thank you so much in advance
     
    emoney8924, Jun 7, 2005
    emoney8924, Jun 7, 2005
    #11
  12. Tnt3932

    Tnt3932 Active Member

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    what could be used as a shield and how would one mount it inside the fenderwall?
     
    Tnt3932, Aug 21, 2005
    Tnt3932, Aug 21, 2005
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  13. silver98v6

    silver98v6 New Member

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    my car has been doing this for a little while now. i have just a CAI. MAF in same location as stock, filter in fenderwell.
     
    silver98v6, Nov 28, 2005
    silver98v6, Nov 28, 2005
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  14. Mustangkid2000

    Mustangkid2000 Well-Known Member

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    hmmmm, what year did you say your car was? Can i see a picture of the engine? If those codes are what I think they are, this problem you have has nothing to do with the MAS sensor.
     
    Mustangkid2000, Nov 28, 2005
    Mustangkid2000, Nov 28, 2005
    #14
  15. agentonge

    agentonge agentonge

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    P1117 ECT Intermittent
    P1451 EVAP Control System Canister Vent Solenoid Circuit Malfunction
     
    agentonge, Dec 22, 2005
    agentonge, Dec 22, 2005
    #15
  16. PballSqu*id69

    PballSqu*id69 New Member

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    steve i know u were familiar with mah car prob and bad idle and wat not i have a bbk fender cai could this be a problem and can u describe a good way to put a blocker in front of it?

    thankz alot
     
    PballSqu*id69, Jan 15, 2006
    PballSqu*id69, Jan 15, 2006
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  17. load

    load New Member

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    I have the same prob with bucking and I have K&N FIPK2. I posted in the drivetrain section of the forums, thinking initially it was the transmission or the clutch.
    http://www.v6mustang.com/threads/144924/

    It is not fenderwell induction - MAF is in the same place - 2002 manual 18k
    I also do not have foglights (but no fenderwell induction so that doesnt matter)
     
    Last edited by a moderator: Oct 23, 2013
    load, Jan 15, 2006
    load, Jan 15, 2006
    #17
  18. Mustang007

    Mustang007 Fire Medic

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    I also have the K&N FIPK2 and i'm having the same problems. I've actually been having this problem for years. It all started when I added the K&N FIPK2. It got worse when I bought a Diablo chip with 93 octane tune. I then switched to SCT and it got better but is still there. I've noticed that it comes and goes but is usually there throughout winter and gets worse the windier and colder it gets outside. I have noticed that my fuel pressure dips erraticly when this happens. Usually from 30psi down to 20psi for split seconds, sometimes lower.

    Could this problem be solved by tuning?
     
    Last edited by a moderator: Oct 23, 2013
    Mustang007, Jan 15, 2006
    Mustang007, Jan 15, 2006
    #18
  19. slvr2000stang

    slvr2000stang Another Statistic

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    From what I can recall it is an issue with the FIPK.
    A friend of mine had an FIPK & switched to an Ebay CAI & it went away.
     
    slvr2000stang, Jan 15, 2006
    slvr2000stang, Jan 15, 2006
    #19
  20. Justin@VMP

    [email protected] New Member

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    Tuning shouldn't be used to fix bad hardware. Do you have the stock CAI? you could put that back on and verify the KN is the problem.
     
    [email protected], Jan 15, 2006
    [email protected], Jan 15, 2006
    #20
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