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  #1  
Old 04-06-2017, 04:51 PM
TheMarauderMan TheMarauderMan is offline
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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.
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Old 04-06-2017, 05:10 PM
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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
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Old 04-07-2017, 09:23 AM
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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
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Old 04-07-2017, 11:04 AM
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Check the PVC tube for leaks. Seems to be a more common cause as of late as the cars age.
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Old 04-07-2017, 12:35 PM
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Anyone got a picture of where the PCV tube is (the leaky part)?
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Old 04-07-2017, 12:57 PM
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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.
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Old 04-07-2017, 01:10 PM
jmsa540 jmsa540 is offline
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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.
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Old 04-09-2017, 12:07 PM
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Is this correct (see picture)?
Attached Images
File Type: jpg PCV Diagnosis.jpg (86.9 KB, 68 views)
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Old 04-09-2017, 12:33 PM
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I had the same problem, when I installed the K&N CAI... This was what I did.
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Last edited by Gerry24; 07-08-2018 at 08:19 PM.
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Old 04-09-2017, 02:43 PM
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Was this just to reinforce the connection, like stress relief?
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Old 04-09-2017, 03:06 PM
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You got it, there was a small hole there and I improvised.
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Old 04-09-2017, 05:28 PM
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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
File Type: jpg pcv hose 1.jpg (95.6 KB, 64 views)
File Type: jpg pcv hose 1a.jpg (98.7 KB, 60 views)
File Type: jpg pcv hose 2.jpg (103.0 KB, 59 views)
File Type: jpg pcv hose 2a.jpg (96.8 KB, 54 views)
File Type: jpg pcv hose 2b.jpg (99.4 KB, 55 views)
File Type: jpg pcv hose 3.jpg (35.8 KB, 47 views)
File Type: jpg pcv hose 4.jpg (62.3 KB, 46 views)
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Old 04-09-2017, 05:33 PM
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Nice right up and images
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Old 04-09-2017, 05:45 PM
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Interesting
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Old 04-09-2017, 09:18 PM
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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?
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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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