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P0171/0174, lean #1&2, fuel related??

Discussion in 'Technical Chat' started by NYCO, Jun 17, 2011.

  1. Jun 17, 2011 at 7:30 AM
    #1
    NYCO

    NYCO [OP] ┌∩┐‹(ಠ_ಠ)›┌∩┐

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    so my situation has gone from annoying to bad to worse.....

    started couple weeks ago with some trouble starting where my truck would "struggle" to turn over. It wasn't a struggle like a weak battery, but it wasn't turning over. changed my spark plugs, cleaned the maf and throttle body and still the troubles continued. So signs have been pointing to some sort of fuel problem from that issue.

    last night on my way home from work, i got a pending trouble code on my ultragauge saying P0171 and P0174 (P0171 came first then P0174 came later in the night).


    possible issues:
    Air induction system
    Injector blockage
    Mass air flow meter
    Engine coolant temp. sensor
    Fuel pressure
    Gas leakage in exhaust system
    Open or short in A/F sensor (bank 1 sensor 1) circuit
    A/F sensor (bank 1 sensor 1)
    PCV valve and hose
    PCV hose connection
    EFI main relay
    A/F sensor heater and relay circuit


    So far i have cleaned my maf again and it looks very clean now when i shine a flash light down in there.

    i had some loose clamps on my volant cai system which i have tightened all down

    i do not notice any loose vacuum lines or obvious cracks or cuts in the lines..

    drove my truck to work this morning and i bogged down bad accelerating onto the highway, almost stalled out...

    i also took the following observations down regarding my fuel trim via my ultragauge...


    idle...
    short trim bank 1 -12 to 2 (usually -2 to 2)
    short trim bank 2 -12 to 3 (usually 0 to 2)
    long trim bank 1 20 to 25 (by the time i got to work it was 28 to 33)
    long trim bank 2 15 to 20 (by the time i got to work it was 25 to 32)

    running...
    short trim bank 1 -17 to 25
    short trim bank 2 -15 to 25
    long trim bank 1 anytime i apply gas it maxes out at 39.84
    long trim bank 2 same as LTB #1



    HELP!!!!:confused:


    info on what mods i have relating to the engine.....

    2006 TRD Off-road V6

    Doug Thorley LT Headers
    Volant CAI with scoop
    URD MAF Sensor Calibrator
    URD (Walbro) Fuel Pump Kit
     
  2. Jun 17, 2011 at 8:19 AM
    #2
    mreimann

    mreimann vv I think it's growing

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    I had the same issue with my truck after I installed the urd maf calibrator and CAI. The issue ended up being a combination of air filter and maf calibrator.

    I fixed it by getting the right air filter and by removing the maf calibrator. I could probably re-instal it, but i've just been lazy.

    not sure if thats how to fix yours, but your symptoms sound a lot like mine.
     
  3. Jun 17, 2011 at 9:14 AM
    #3
    NYCO

    NYCO [OP] ┌∩┐‹(ಠ_ಠ)›┌∩┐

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    hoping not to remove the calibrator....

    this sucks...worse timing too, right before the weekend!
     
  4. Jun 17, 2011 at 11:17 AM
    #4
    NYCO

    NYCO [OP] ┌∩┐‹(ಠ_ಠ)›┌∩┐

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    anyone else have any similar issues?
     
  5. Jun 17, 2011 at 3:07 PM
    #5
    98tacoma27

    98tacoma27 is gooder 'en chicken Moderator

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    Can you easily disconnect the MAF cal to see if it changes it?

    Is there a fuel pressure problem?
     
  6. Jun 17, 2011 at 3:21 PM
    #6
    NYCO

    NYCO [OP] ┌∩┐‹(ಠ_ಠ)›┌∩┐

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    :confused:

    not really...all the wires were soldered together...no plug and play option

    so removing the calibrator would involve cutting and solder the original wires back together
     
  7. Jun 17, 2011 at 3:30 PM
    #7
    NYCO

    NYCO [OP] ┌∩┐‹(ಠ_ಠ)›┌∩┐

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    great reading...where did you find that from?
     
  8. Jun 17, 2011 at 3:31 PM
    #8
    NYCO

    NYCO [OP] ┌∩┐‹(ಠ_ಠ)›┌∩┐

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    correct, the maf hasn't moved...he mentioned removing the maf calibrator which splices into the ecu
     
  9. Jun 17, 2011 at 3:32 PM
    #9
    NYCO

    NYCO [OP] ┌∩┐‹(ಠ_ಠ)›┌∩┐

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    haven't had that tested yet
     
  10. Jun 17, 2011 at 4:31 PM
    #10
    NYCO

    NYCO [OP] ┌∩┐‹(ಠ_ಠ)›┌∩┐

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    Fuel pressure @ 20psi! Wtf!
     
  11. Jun 17, 2011 at 4:35 PM
    #11
    98tacoma27

    98tacoma27 is gooder 'en chicken Moderator

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    That be the problem.
     
  12. Jun 17, 2011 at 4:39 PM
    #12
    ColtsTRD

    ColtsTRD .....

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    mine was running rich as hell a couple weeks ago and throwing codes as well. It would run for about 5 seconds and then die...the things smelled like a muscle car it was burning so rich...ended up being a misplaced fuse. I had added a add a circuit for my CB and plugged it into the ECU area in my fuse box...it over loaded and fried my MAF too...thank god thats all it was! It cost 100 bucks to fix
     
  13. Jun 17, 2011 at 5:03 PM
    #13
    98tacoma27

    98tacoma27 is gooder 'en chicken Moderator

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  14. Jun 17, 2011 at 5:12 PM
    #14
    NYCO

    NYCO [OP] ┌∩┐‹(ಠ_ಠ)›┌∩┐

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    Yup should be 40psi....

    Got a new filter to try the cheap fix...hoping its not the pump!
     
  15. Jun 17, 2011 at 6:14 PM
    #15
    NYCO

    NYCO [OP] ┌∩┐‹(ಠ_ಠ)›┌∩┐

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    so changed out the filter and still having starting issues and my long fuel trim maxes out at 39.84 everytime i touch the gas pedal....fml

    fuel pump is less than a year old too!!!
     
  16. Jun 17, 2011 at 6:14 PM
    #16
    98tacoma27

    98tacoma27 is gooder 'en chicken Moderator

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    Warranty?
     
  17. Jun 17, 2011 at 6:16 PM
    #17
    NYCO

    NYCO [OP] ┌∩┐‹(ಠ_ಠ)›┌∩┐

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    GADGET!!!!!!!!!!!!!!!!!




    i'll have to check
     
  18. Jun 17, 2011 at 6:17 PM
    #18
    98tacoma27

    98tacoma27 is gooder 'en chicken Moderator

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    Man that sucks.
     
  19. Jun 17, 2011 at 6:20 PM
    #19
    NYCO

    NYCO [OP] ┌∩┐‹(ಠ_ಠ)›┌∩┐

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    tell me about it....killed my weekend plans
     
  20. Jun 17, 2011 at 6:35 PM
    #20
    98tacoma27

    98tacoma27 is gooder 'en chicken Moderator

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    Have you tried the old shadetree mechanic trick and smacked the fuel tank with a rubber mallet while trying to start it?
     
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