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Persistent fuel intake problem (P0171)

Discussion in '1st Gen. Tacomas (1995-2004)' started by Benfatto, Dec 21, 2016.

Page 2 of 5
  1. Dec 29, 2016 at 9:02 PM
    #21
    jammer

    #21
    jammer 2003 Toyota PreRunner 3.4L

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    I experienced the same problems when I had a cracked spark plug in my 3.4. Dealership replaced my plugs and when going up any sort of incline the truck would stall and skip. Idling or just going down the the road you couldn't tell there was an issue. The check engine light never came on.
    Took it back to the dealership and they had over tightened and cracked one of the plugs.
    Good Luck and hope you find the problem
     
    jammer, Dec 29, 2016
    #21
    mechanicjon likes this.
  2. Dec 29, 2016 at 9:16 PM
    #22
    mechanicjon

    #22
    mechanicjon They call me "Jonny Stubs"

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    4 cylinder. 1 coil. Have you looked at distributer cap and rotor?
     
    mechanicjon, Dec 29, 2016
    #22
    ThunderOne[QUOTED] likes this.
  3. Dec 30, 2016 at 11:00 AM
    #23
    Benfatto

    #23
    Benfatto [OP] Well-Known Member

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    Yeah maybe I should not rely on the computer giving me the correct code and check the ignition instead. Next week I'll look at it with someone else.
     
    Benfatto, Dec 30, 2016
    #23
  4. Jan 5, 2017 at 8:19 AM
    #24
    Benfatto

    #24
    Benfatto [OP] Well-Known Member

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    [​IMG]
    Does this look the way it's supposed to look?
     
    Benfatto, Jan 5, 2017
    #24
  5. Jan 5, 2017 at 8:27 AM
    #25
    Benfatto

    #25
    Benfatto [OP] Well-Known Member

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    And the coil is hidden inside the block on the front?
     
    Benfatto, Jan 5, 2017
    #25
  6. Jan 5, 2017 at 8:35 AM
    #26
    Mush Mouse

    #26
    Mush Mouse Club Soda Not Seals

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    where ever you want me to be
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    its a Toyota truck and that's all the modifications needed
    Mush Mouse, Jan 5, 2017
    #26
  7. Jan 5, 2017 at 8:53 AM
    #27
    mechanicjon

    #27
    mechanicjon They call me "Jonny Stubs"

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    ok to remove that cover just put it back.

    img_20170105_104137.jpg
     
    mechanicjon, Jan 5, 2017
    #27
  8. Jan 5, 2017 at 9:11 AM
    #28
    mechanicjon

    #28
    mechanicjon They call me "Jonny Stubs"

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    Are you able to read live data with code reader? or just codes?
     
    mechanicjon, Jan 5, 2017
    #28
  9. Jan 5, 2017 at 9:29 AM
    #29
    Benfatto

    #29
    Benfatto [OP] Well-Known Member

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    I can't take the cover off without breaking it. Perhaps i'm missing something
     
    Benfatto, Jan 5, 2017
    #29
  10. Jan 5, 2017 at 9:30 AM
    #30
    Benfatto

    #30
    Benfatto [OP] Well-Known Member

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    Just codes. And I'm not getting any, ever since I fixed the vacuum leak.
     
    Benfatto, Jan 5, 2017
    #30
  11. Jan 5, 2017 at 9:31 AM
    #31
    eon_blue

    #31
    eon_blue If I would, could you

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    This. I had a P0171 for awhile back when I first got my truck, the shop replaced the MAF, O2 and air/fuel sensors as well as my spark plugs and wires and still couldn't get it to go away. Finally we traced it to a vacuum leak on the TRD supercharger, the tech that found it told me that with a P0171 it's almost always a vacuum or exhaust leak somewhere.
     
    eon_blue, Jan 5, 2017
    #31
  12. Jan 5, 2017 at 9:35 AM
    #32
    Benfatto

    #32
    Benfatto [OP] Well-Known Member

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    Yes I found a leak on both the intake and the exhaust and I fixed those. I'm no longer getting any code, yet I still have problems. Anytime I need power, uphill or when accelerating quickly, the engine stutters and almost stalls.
     
    Benfatto, Jan 5, 2017
    #32
  13. Jan 5, 2017 at 9:35 AM
    #33
    eon_blue

    #33
    eon_blue If I would, could you

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    Was it doing that back when you had the code/before you fixed the leaks? Or is this a new issue that started right after?
     
    eon_blue, Jan 5, 2017
    #33
  14. Jan 5, 2017 at 9:38 AM
    #34
    eon_blue

    #34
    eon_blue If I would, could you

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    I was going to say it sounds like a fuel delivery issue but it sounds like you've tested it all already...have you tried checking it for codes even though the check engine light isn't on? Codes sometimes get stored without showing up as a CEL. Seems like an issue like that would throw some kind of code.
     
    eon_blue, Jan 5, 2017
    #34
  15. Jan 5, 2017 at 9:38 AM
    #35
    Benfatto

    #35
    Benfatto [OP] Well-Known Member

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    I have this problem ever since I got the car 2 years ago. It used to occur only after a very long drive, more than 3 hours. Now I have it all the time. I checked and replaced almost anything I could think of.
     
    Benfatto, Jan 5, 2017
    #35
  16. Jan 5, 2017 at 9:40 AM
    #36
    eon_blue

    #36
    eon_blue If I would, could you

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    hmmm weird. You've replaced the spark plugs/wires? How many miles are on them?
     
    eon_blue, Jan 5, 2017
    #36
  17. Jan 5, 2017 at 9:49 AM
    #37
    CD20H

    #37
    CD20H Well-Known Member

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    Ok, here is what you do.
    Check the spark on the plugs. Pull one plug, leave it connected to the wire, place the plug on a metal surface ON THE ENGINE and have someone turn the engine over. Look for a distinctive blue spark. If the spark is blue and strong, reinstall spark plug and move to the next. This will eliminate the spark issue.
     
    CD20H, Jan 5, 2017
    #37
    eon_blue likes this.
  18. Jan 5, 2017 at 10:01 AM
    #38
    10MGM

    #38
    10MGM Well-Known Member

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    Temperature related. If possible test ignition coil when hot or replace with known good one. Distributor rotor looks suspect. I would replace rotor and cap regardless.
     
    10MGM, Jan 5, 2017
    #38
  19. Jan 5, 2017 at 10:08 AM
    #39
    Benfatto

    #39
    Benfatto [OP] Well-Known Member

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    Where did they hide the ignition coil on this engine?
     
    Benfatto, Jan 5, 2017
    #39
  20. Jan 5, 2017 at 10:10 AM
    #40
    Benfatto

    #40
    Benfatto [OP] Well-Known Member

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    $12 on Amazon, yeah why not
     
    Benfatto, Jan 5, 2017
    #40
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