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Thread: P0174 system too lean bank 2

  1. #1
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    P0174 system too lean bank 2

    Hey guys this is the first time I've posted on this site, hope I'm in the right spot. On my home earlier my car started hesitating and missing out of nowhere. No engine codes threw. Got home, let the car sit and then came back out to screw with it and the engine code finally threw p0174. I've looked the code up and I know what Google will give me and it's not enough to go on. Just curious if anyone has any knowledge they can drop on me, I would greatly appreciate it. Thanks.

  2. #2
    Join Date
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    could be vacuum leak, check vac lines for cracks, they get brittle over time. could be 02 sensor, coukd be dirty maf
    2004 SB Ported Trilogy 48
    Has supporting mods and stuff
    Thanks to Marty O for his help in updating this car.

    R.I.P.
    Rex "SC Cheesehead"

  3. #3
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    Hey there I just had this problem last week. Codes read p0171 and p0174 took it to the dealership and the pcv tube was leaking. Small crack underneath the tube was causing the codes and too much air in the system. the part was 50bucks at ford. After the fix check engine light was cleared and she's running wel as of right now. Just my two cents. Good luck bud
    Born 06/17/03
    2003 B
    #7,784 of 7,838

  4. #4
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    Check the PVC tube for leaks. Seems to be a more common cause as of late as the cars age.

  5. #5
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    Anyone got a picture of where the PCV tube is (the leaky part)?

    "That's what." - She

    Kenny Brown Mercury Marauder 'S' - Kenny Brown Signature Edition #10 of 10
    Silver Birch #126 of 426 (in 2003)
    Mercury Division, Ford Motor Company, Panther/Marauders #7,221 of 7,838 (in 2003)



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  6. #6
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    Quote Originally Posted by N40GL View Post
    Anyone got a picture of where the PCV tube is (the leaky part)?
    For me it was right where the hose hooks up to the upper intake area. The center section is a hard plastic or metal. The soft ends are where the problem seems to present itself.

  7. #7
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    You can't miss it, it's a very large house connected to the intake cover. PM me and I can walk you through it.
    '03 300A Marauder, 107K miles, flowmaster 40 series mufflers, 2nd cats deleted, HID 6000K foglights, SilverStar Ultra's headlights, goodyear gatorback belt, K&N FIPK, K&N drycharger, SS inserts, spoiler, MSD COP's, Nitto Motivo's.

  8. #8
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    Is this correct (see picture)?
    Attached Images Attached Images

    "That's what." - She

    Kenny Brown Mercury Marauder 'S' - Kenny Brown Signature Edition #10 of 10
    Silver Birch #126 of 426 (in 2003)
    Mercury Division, Ford Motor Company, Panther/Marauders #7,221 of 7,838 (in 2003)



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  9. #9
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    I had the same problem, when I installed the K&N CAI... This was what I did.
    Last edited by Gerry24; 07-08-2018 at 08:19 PM.

    Righteous Indignation
    03 300A
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    4054 of 7093 in Black.
    Born 8/23/02
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  10. #10
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    Was this just to reinforce the connection, like stress relief?

    "That's what." - She

    Kenny Brown Mercury Marauder 'S' - Kenny Brown Signature Edition #10 of 10
    Silver Birch #126 of 426 (in 2003)
    Mercury Division, Ford Motor Company, Panther/Marauders #7,221 of 7,838 (in 2003)



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  11. #11
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    You got it, there was a small hole there and I improvised.

    Righteous Indignation
    03 300A
    4055 of 7838
    4054 of 7093 in Black.
    Born 8/23/02
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  12. #12
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    After figuring all this out, here's what I did (in case anyone else has this quirky setup on their MM).

    Patient: 2003 MM, Kenny Brown Supercharged.

    1. First problem: where's the PCV valve? Apparently it's on the back of the driver's side valve cover (see picture 1). The part I got from Napa wasn't anything like what I needed. Fortunately, I had one in the tool box and swapped it. I plugged the second tube, and then glued and heat shrunk the little plug over the tube to make sure it stayed (that's the blue tubing) (see picture 1a).

    2. I couldn't figure out what was at the other end of the hose, since it had three hose clamps (see picture 2). After taking it apart, it was a brass sizing neck, changing the size of the small hose (from the PCV valve) to the larger size going into the intake.

    3. So I used a larger hose to go into the intake (see picture 2a), and used the brass sizing neck to join the smaller hose from the PCV valve (see picture 2.b).

    TBD: We'll see if it throws any more P0174 codes.

    I'd be interested to learn if anyone else's intake looks like mine. The PCV valve that Napa thought I needed (see picture 3) (Motorcraft P/N EV257) fits nowhere on my car. The Deutsch part (see picture 4) did.
    Attached Images Attached Images

    "That's what." - She

    Kenny Brown Mercury Marauder 'S' - Kenny Brown Signature Edition #10 of 10
    Silver Birch #126 of 426 (in 2003)
    Mercury Division, Ford Motor Company, Panther/Marauders #7,221 of 7,838 (in 2003)



    How the management of 'MercuryMarauder.net' works.

  13. #13
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    Nice right up and images

    Righteous Indignation
    03 300A
    4055 of 7838
    4054 of 7093 in Black.
    Born 8/23/02
    Adopted in 1/15.

  14. #14
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    Interesting
    '03 300A Marauder, 107K miles, flowmaster 40 series mufflers, 2nd cats deleted, HID 6000K foglights, SilverStar Ultra's headlights, goodyear gatorback belt, K&N FIPK, K&N drycharger, SS inserts, spoiler, MSD COP's, Nitto Motivo's.

  15. #15
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    I may have spoken too soon. I have another PCV valve on the passenger side, front of the valve cover (nearest the radiator). In that one, the Motorcraft part fits. So I've now changed both, and put on new hoses and related hardware. I have a pending code in the computer (P0174), so am mystified as to what's causing it.

    Anyone have ideas?

    "That's what." - She

    Kenny Brown Mercury Marauder 'S' - Kenny Brown Signature Edition #10 of 10
    Silver Birch #126 of 426 (in 2003)
    Mercury Division, Ford Motor Company, Panther/Marauders #7,221 of 7,838 (in 2003)



    How the management of 'MercuryMarauder.net' works.

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