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Thread: P0174 system too lean bank 2

  1. #16
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    Quote Originally Posted by N40GL View Post
    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?
    Check your PMs.

  2. #17
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    I've just had the code just pop up. I'm going to check that PVC hose first. I thought the car sounded a little different but haven't noticed any other issues.



    2003 Mercury Marauder 300B (Daily Driver)
    1988 LTD Crown Victoria S

  3. #18
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    Just went tru this, culprit was K&N discharge at throttle body intake , both clamps loose and probably sucking air and all not going thru MAF. tightened clamps cleared code, cleaned MAF and all good.
    hope it helps

  4. #19
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    I switched to JLT about a year ago. Did take a quick look this morning but didn't see anything obviously loose. But I'll take a closer look later. I did clear the code to see if it comes back.
    2003 Mercury Marauder 300B (Daily Driver)
    1988 LTD Crown Victoria S

  5. #20
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    I cleared the code and the Check Engine Light has not come on again yet. I drove about 60 miles. Let the car idle in the parking lot at work today and idle sounds slightly not as smooth as usual but ok. Maybe need to clean the idle air motor or something. I opened the hood to feel and visually inspect the PVC and the hoses and the connecter to the Mass air flow sensor. Everything seemed fine and secure.
    As I got back in the car, the car died. Started car and it runs normally again so probably a fluke. Did check for more codes but got P1000 which I think the means the car hasn't been driven enough yet to finish its tests.
    2003 Mercury Marauder 300B (Daily Driver)
    1988 LTD Crown Victoria S

  6. #21
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    OK, the check engine light came back on. Same P0174 but also now showing P0171. Which I believe is too lean bank 1. P1000 hasn't gone away yet but I assume that will go away once enough miles are on the car.

    Can hear that the idle is not quite normal.
    2003 Mercury Marauder 300B (Daily Driver)
    1988 LTD Crown Victoria S

  7. #22
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    Oh and I did try another Mass Airflow sensor and that didn't change anything.
    2003 Mercury Marauder 300B (Daily Driver)
    1988 LTD Crown Victoria S

  8. #23
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    Check the large hose that enters the upper intake on the right side.


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  9. #24
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    OK. I see the tear now in the big vacuum line near the intake on the passenger side. That has to be the problem.
    2003 Mercury Marauder 300B (Daily Driver)
    1988 LTD Crown Victoria S

  10. #25
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    Do my eyes deceive me, or does that vacuum line somehow attach to the other two smaller vacuum lines? Or is that somekind of other piece that I wouldn't have to replace?
    2003 Mercury Marauder 300B (Daily Driver)
    1988 LTD Crown Victoria S

  11. #26
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    2003 Mercury Marauder 300B (Daily Driver)
    1988 LTD Crown Victoria S

  12. #27
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    The picture doesn't quite do it justice, but the tear is more in the shaded part continuing along the side.
    2003 Mercury Marauder 300B (Daily Driver)
    1988 LTD Crown Victoria S

  13. #28
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    Unless I got the wrong code as 0194--

    Believe had same code/problem and if so it was the fuel rail sensor--replaced- all good--

    Update---my bad --it was 0194 not 0174--carry on...
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  14. #29
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    I'm going to do the Red Green method and put some duct tape on there for now.
    2003 Mercury Marauder 300B (Daily Driver)
    1988 LTD Crown Victoria S

  15. #30
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    Quote Originally Posted by 88LTDCV351 View Post
    OK. I see the tear now in the big vacuum line near the intake on the passenger side. That has to be the problem.


    That’s the one I was referring to. A piece of heater hose and two zip ties and be done.


    Sent from my iPhone using Tapatalk Pro
    SOLD 12/31/2021

    Cobra short block / ProCharger F1-A / Cog drive upgrade / Manley valves / Brian Tooley Racing valve springs / 80# inj. / -8 fuel line / -6 return / Aeromotive 340 pumps and regulator / 2012 GT500 TR6060 six speed / twin disc clutch / Driveshaft Shop GT500 upgraded CV joint shaft / BA5000 blow thru MAF/ 4.10's / Ford Racing 31 spline set up and Girdle / Metco D.S. safety loop / Stainless Works headers, cats, and everything else out back / ClassGlass hood / Bob's hood strut mod / Hurst line lock / Metco control arms / Addco front and rear sway bars / Monroe severe duty shocks all around / Race concepts rotors / Badgeless grille / 35% tint / FBM's interior LED kit and ambient lighting kit / Pioneer FB700 deck / kenwood speaker 4 Ch. / Rockford Fosgate 10" sub and amp / Kicker 6 X 8's all around / back up cam / bluetooth / Pioneer Xm / 704 RWHP 603 RWTQ tuned by Mo's Speedshop.

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