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P0174 Code and intermittent sputtering

Discussion in '1st Gen Tundras (2000-2006)' started by socomoby, Jan 4, 2025.

  1. Jan 15, 2025 at 1:52 AM
    #31
    socomoby

    socomoby [OP] New Member

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    To be thorough I plan to put a homemade smoke machine together than test the vacuum lines. Also plan to buy a fuel injection test kit and test the fuel pump. The P0441 and P0455 came back as well but now that I’m thinking I believe the ECM is thinking I have a massive leak because LongFT1 is far behind LongFT2 now.

    What’s still crazy to me is if I have a leak that large you’d think I’d hear/see/smell it. I’m kinda hoping it is the fuel pump now because if not, this is one massively evasive, yet intense vac leak. Outside of a cold start idle that may be 2-3pm higher than normal, the truck settles out back around 600 rpm at idle when warm and doesn’t miss a beat when driving

    I’ll report back soon
     
  2. Jan 15, 2025 at 4:32 AM
    #32
    shifty`

    shifty` We skipped the light fandango

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    (see signature for truck info)
    Stupid question but have you checked for holes in the tank (i.e. crackhead was going to steal your gas), or squirrels chewing on the fittings, which we’ve seen way too much, even @abcinv threw codes because they chewed up his filler neck? Do you park outdoors, ever, for 1-2hr or more where that could happen? Have you smelled around under the truck for gas after the truck has been sitting for a while?
     
  3. Jan 15, 2025 at 4:40 AM
    #33
    socomoby

    socomoby [OP] New Member

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    It’s outdoors 99% of time. However I previously checked for rodent nests on top of the tank and saw nothing. Have also checked the soy-based fittings, hoses etc and also have found nothing.

    No in gas tank, no signs of gas leakage, fuel filler neck seemed fine. I didn’t get close to the filler neck so I suppose I can get a tad bit closer but it looked fine. Unless I’m missing something, I really hope it’s either a small (but intense) vac leak or the pump itself. It’s weird
     
  4. Jan 15, 2025 at 4:52 AM
    #34
    shifty`

    shifty` We skipped the light fandango

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    (see signature for truck info)
    I’d just forego the head scratching and smoke test it. Test it at the test port in the engine bay, driver side, and also test directly at the gas cap.

    It should highlight where your problem is.
     
  5. Jan 18, 2025 at 1:35 PM
    #35
    socomoby

    socomoby [OP] New Member

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    Update #2:

    So I’ll try to keep it short and sweet,

    Finally got around test the fuel pressure. Got up to 42 psi at idle and then down to 29-30 psi 5 minutes post-shutdown. As far as that test the fuel pump seems fine…

    IMG_6327.jpg

    IMG_6329.jpg

    Done a smoke test with the homemade smoke machine (slight shit show at the end) and saw absolutely nothing. Made sure intake and TB were closed off completely. No smoke. HOWEVER, unlike last time, I happen to see the slightest nick in the PCV hose. I only saw it because condensation was flowing towards it. Looked dry inside and when I flexed the hose I couldn’t see anything. Smoked it on its own and I’m almost certain no smoke released. I patched and taped the nick temporarily.

    Now here’s what’s weird. On my first update I pulled all EVAP hoses in the bay and re-inspected them. When input them back and checked scanner for giggles, the SHRTFTs were running really rich. Like the PCM was trying to finally balance out the LONGs.

    IMG_6330.jpg

    Each time I shut off and restarted, The LONGs got marginally better. Almost like I “burped” the EVAP lines. Not sure if that’s the case or it’s the PCV hose but my numbers are looking a lot more acceptable. Hasn’t had time to drive her around. Will do that then report back if this is resolved or not.
    IMG_6339.jpg

    Side note: considering I’m just shy of 200k, Now I’m wondering if I’m an idiot and if the 3 stammering starts are actually a slowly failing starter…
     
  6. Jan 18, 2025 at 2:11 PM
    #36
    bfunke

    bfunke Tundra Curmudgeon

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    Show us how that pressure gauge is hooked up to the fuel rail.
     
  7. Jan 18, 2025 at 2:29 PM
    #37
    socomoby

    socomoby [OP] New Member

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    2006 DC V8/2WD SR5 LSD
    Removed the 17mm bolt on Bank 1s side and attached a schrader there. Probably should have done it on Bank 2s side but hopefully it won’t matter. IMG_6328.jpg
     
    bfunke[QUOTED] likes this.

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