1. Welcome to Tundras.com!

    You are currently viewing as a guest! To get full-access, you need to register for a FREE account.

    As a registered member, you’ll be able to:
    • Participate in all Tundra discussion topics
    • Transfer over your build thread from a different forum to this one
    • Communicate privately with other Tundra owners from around the world
    • Post your own photos in our Members Gallery
    • Access all special features of the site

Multiple misfires after rebuild ** FIXED **

Discussion in '1st Gen Tundras (2000-2006)' started by Brynden29, Jul 16, 2022.

  1. Aug 11, 2022 at 3:28 PM
    #391
    Brynden29

    Brynden29 [OP] 2002 Tundra Limited

    Joined:
    May 16, 2020
    Member:
    #46632
    Messages:
    344
    Gender:
    Male
    First Name:
    Brynden
    Georgetown, Texas
    Vehicle:
    2002 Tundra Limited
  2. Aug 11, 2022 at 5:54 PM
    #392
    shifty`

    shifty` The Second Shortcoming of Christ

    Joined:
    Jun 20, 2020
    Member:
    #48239
    Messages:
    19,079
    ATL
    Vehicle:
    '06 AC Limited V8/4WD
    (see signature for truck info)
    Hmmm... I wonder if it's misfiring when the B1S1 O2 isn't reading? I see in the 2nd one, that last video, it's reporting.

    I may not be qualified to talk on this one.
     
  3. Aug 11, 2022 at 6:06 PM
    #393
    Brynden29

    Brynden29 [OP] 2002 Tundra Limited

    Joined:
    May 16, 2020
    Member:
    #46632
    Messages:
    344
    Gender:
    Male
    First Name:
    Brynden
    Georgetown, Texas
    Vehicle:
    2002 Tundra Limited
    It doesn’t seem to be cycling like it is supposed to. It was at 0 volts all the way home.

    The other issue is I had to extend the wires because I have long tube headers. I don’t think that would cause an issue but it is something I had to do.
     
  4. Aug 11, 2022 at 6:09 PM
    #394
    shifty`

    shifty` The Second Shortcoming of Christ

    Joined:
    Jun 20, 2020
    Member:
    #48239
    Messages:
    19,079
    ATL
    Vehicle:
    '06 AC Limited V8/4WD
    (see signature for truck info)
    I dunno, others have suggested the lines are fairly sensitive, and doing anything to the wiring, including purposeful or accidental splices, extending, etc. could impact signals being sent and received.

    Why would it only happen on Bank 1? Great question. How would you get around it or test it? No clue.

    @empty_lord, you're running LT headers, right? What'd you do on yours?
     
    N84434 likes this.
  5. Aug 11, 2022 at 7:00 PM
    #395
    empty_lord

    empty_lord They see me rollin'

    Joined:
    Feb 1, 2019
    Member:
    #25441
    Messages:
    10,024
    Gender:
    Male
    First Name:
    Dan
    Indiana, Chicagoland
    Vehicle:
    05 rollover special
    custom body work, Billies with taco ARB springs, Icon AAL, TRD FJ trail team wheels, 2019 Toyota 86 radio, Blacked out interior, Added factory power everything, heater mirrors, ETC
    I have extension harnesses.
     
  6. Aug 11, 2022 at 7:18 PM
    #396
    Brynden29

    Brynden29 [OP] 2002 Tundra Limited

    Joined:
    May 16, 2020
    Member:
    #46632
    Messages:
    344
    Gender:
    Male
    First Name:
    Brynden
    Georgetown, Texas
    Vehicle:
    2002 Tundra Limited
    Where did you get them?
     
  7. Aug 11, 2022 at 7:49 PM
    #397
    empty_lord

    empty_lord They see me rollin'

    Joined:
    Feb 1, 2019
    Member:
    #25441
    Messages:
    10,024
    Gender:
    Male
    First Name:
    Dan
    Indiana, Chicagoland
    Vehicle:
    05 rollover special
    custom body work, Billies with taco ARB springs, Icon AAL, TRD FJ trail team wheels, 2019 Toyota 86 radio, Blacked out interior, Added factory power everything, heater mirrors, ETC
    Ballenger motorsprts.
     
  8. Aug 12, 2022 at 4:32 AM
    #398
    dbittle

    dbittle Middle Age Member

    Joined:
    Aug 10, 2020
    Member:
    #50632
    Messages:
    227
    Gender:
    Male
    Huntsville AL
    Vehicle:
    2006 V8 RCLB 2WD
    It jumped out at me that the long term fuel trims on both banks were 21%. Something, and it could be o2 sensors, is making the ecu dump tons of fuel into the engine. Are the plugs really black?
     
    shifty` likes this.
  9. Aug 12, 2022 at 4:51 AM
    #399
    Brynden29

    Brynden29 [OP] 2002 Tundra Limited

    Joined:
    May 16, 2020
    Member:
    #46632
    Messages:
    344
    Gender:
    Male
    First Name:
    Brynden
    Georgetown, Texas
    Vehicle:
    2002 Tundra Limited
    I can check them today. I do have the 12 hole injectors from dirty deeds. Maybe the ECU needs to figure them out?
     
  10. Aug 12, 2022 at 5:02 AM
    #400
    shifty`

    shifty` The Second Shortcoming of Christ

    Joined:
    Jun 20, 2020
    Member:
    #48239
    Messages:
    19,079
    ATL
    Vehicle:
    '06 AC Limited V8/4WD
    (see signature for truck info)
    That could be, but usually I'd expect the ECU to dump lots of fuel if its intake sensor(s), i.e. MAF in this case, detected a shit-ton of air coming in OR the O2 sensors were telling it you were burning overly-lean. Remember, 3 things needed for an engine to run: metered air, fuel, spark. The ECU's job is to use the MAF, IAC, TB to electronically meter and control the air coming in so it knows how much fuel it needs to spray, throws its spark in-time, then measures the result on the backside using O2 sensors. If it detects too rich on the backside, it should adjust the fuel down, or vice-versa, adjust the fuel output up if too rich.

    If you think about it as a logical chain like that, it really helps for troubleshooting purposes. It's really easy to confirm spark and timing, as you already have done. It's easy to measure the MAF is in spec. It's not so easy to see what the O2 sensors are doing or reading, or what the injectors are outputting. Also not easy to ensure the TB and sensors associated with it are calibrated and working. That's something I've always needed to lookup on a car-by-car basis.
     
    Brynden29[QUOTED][OP] likes this.
  11. Aug 12, 2022 at 5:03 AM
    #401
    Brynden29

    Brynden29 [OP] 2002 Tundra Limited

    Joined:
    May 16, 2020
    Member:
    #46632
    Messages:
    344
    Gender:
    Male
    First Name:
    Brynden
    Georgetown, Texas
    Vehicle:
    2002 Tundra Limited
    That video was also at idle when I just started the truck. Would that make a difference?
     
  12. Aug 12, 2022 at 5:05 AM
    #402
    shifty`

    shifty` The Second Shortcoming of Christ

    Joined:
    Jun 20, 2020
    Member:
    #48239
    Messages:
    19,079
    ATL
    Vehicle:
    '06 AC Limited V8/4WD
    (see signature for truck info)
    Possibly? I'd expect less at idle, but every engine is different. My familiarity with 2UZ isn't huge. I can sit here and talk shop with you about deep internals of GenIII SBC engines all day long. I'm really learning as I go with these Toyota engines.
     
    Brynden29[QUOTED][OP] likes this.
  13. Aug 12, 2022 at 9:08 AM
    #403
    Brynden29

    Brynden29 [OP] 2002 Tundra Limited

    Joined:
    May 16, 2020
    Member:
    #46632
    Messages:
    344
    Gender:
    Male
    First Name:
    Brynden
    Georgetown, Texas
    Vehicle:
    2002 Tundra Limited
    So I used a smoke machine to check for vacuum leaks and I don’t have any, which is good. I have the new o2 sensor and I didn’t have to extend the cable. I just took the connector from the stock location under the header and ran it down between the engine and tranny and it reaches perfectly to the new o2 sensor. I am going to replace one vacuum line that is old and brittle just to be safe then I will fire it up and check it out.
     
  14. Aug 12, 2022 at 9:13 AM
    #404
    KNABORES

    KNABORES Sarcasm incoming

    Joined:
    Jan 1, 2020
    Member:
    #40572
    Messages:
    8,911
    Gender:
    Male
    Arkansas
    Vehicle:
    2000 Limited TRD AC 4X4 Thunder Grey 270k miles. 2019 Limited TRD CM 4x4 Cement Grey 75k miles
    2000: Bilstein 5100's 16x8 589's with 265/75/16 and 1.25" spacers Flowmaster 50 series over the axle dump Pioneer touchscreen with backup camera Full interior and dash LED conversion Trailer brake controller with 7 pin Bedliner coat bumpers & trim ARE topper 2019: ARE topper with full Bedrug kit and Vortex rack TRD shifter 1.25" wheel spacers (I like to live dangerously) Red tow hooks for that +15 grip bonus
    For the wiiin!!! Doing an ancient dance to ward off check engine lights and codes right now.
     
    NewImprovedRon and FrenchToasty like this.
  15. Aug 12, 2022 at 9:48 AM
    #405
    Brynden29

    Brynden29 [OP] 2002 Tundra Limited

    Joined:
    May 16, 2020
    Member:
    #46632
    Messages:
    344
    Gender:
    Male
    First Name:
    Brynden
    Georgetown, Texas
    Vehicle:
    2002 Tundra Limited
    Does resetting the ECU actually do anything? I’m wondering if I should just disconnect the battery for a few minutes before trying it again.
     
    FrenchToasty likes this.
  16. Aug 12, 2022 at 10:01 AM
    #406
    dbittle

    dbittle Middle Age Member

    Joined:
    Aug 10, 2020
    Member:
    #50632
    Messages:
    227
    Gender:
    Male
    Huntsville AL
    Vehicle:
    2006 V8 RCLB 2WD
    Good on the smoke test! Would you be able to re-do the data video with the truck at normal operating temperature? That would tell us if the fuel trim anomaly was just because the truck was cold. If it wasn't a real symptom, we're headed in the wrong direction if we chase it.
     
  17. Aug 12, 2022 at 10:35 AM
    #407
    Brynden29

    Brynden29 [OP] 2002 Tundra Limited

    Joined:
    May 16, 2020
    Member:
    #46632
    Messages:
    344
    Gender:
    Male
    First Name:
    Brynden
    Georgetown, Texas
    Vehicle:
    2002 Tundra Limited
    Here’s a video of the start up after resetting the ECU. The misfires start right after I start it. I don’t think the o2 sensors even start working yet.

    https://youtu.be/6cwWHo1Jovs
     
  18. Aug 12, 2022 at 11:20 AM
    #408
    shifty`

    shifty` The Second Shortcoming of Christ

    Joined:
    Jun 20, 2020
    Member:
    #48239
    Messages:
    19,079
    ATL
    Vehicle:
    '06 AC Limited V8/4WD
    (see signature for truck info)
    Resetting ECU just forces it to start over from scratch on what it's learned so far. Think of it as induced amnesia. The engine can definitely do all the things it needs to survive still, but it hasn't quite tuned itself in to be able to do everything efficiently. So sometimes you'll see weird idling, other strange behaviors.

    That said, after you complete a full drive cycle, it may iron the wrinkles out and everything stops failing. I've had a couple of cars in the past that'll automatically stop the drive cycle test if something is 'off' enough to throw a code though. Like, they won't bother to complete the drive cycle / calibration cycle until you fix whatever tripped the code. Not sure if Toyota does that.
     
  19. Aug 12, 2022 at 12:13 PM
    #409
    Brynden29

    Brynden29 [OP] 2002 Tundra Limited

    Joined:
    May 16, 2020
    Member:
    #46632
    Messages:
    344
    Gender:
    Male
    First Name:
    Brynden
    Georgetown, Texas
    Vehicle:
    2002 Tundra Limited
    The number 7 plug is black.
    A9CF9FFA-377E-4AF7-8E61-5106B3F63A7D.jpg
     
  20. Aug 12, 2022 at 12:18 PM
    #410
    shifty`

    shifty` The Second Shortcoming of Christ

    Joined:
    Jun 20, 2020
    Member:
    #48239
    Messages:
    19,079
    ATL
    Vehicle:
    '06 AC Limited V8/4WD
    (see signature for truck info)
    Holy shit, that's really really black.
     
    FrenchToasty likes this.
  21. Aug 12, 2022 at 12:18 PM
    #411
    Brynden29

    Brynden29 [OP] 2002 Tundra Limited

    Joined:
    May 16, 2020
    Member:
    #46632
    Messages:
    344
    Gender:
    Male
    First Name:
    Brynden
    Georgetown, Texas
    Vehicle:
    2002 Tundra Limited
    Here are all the plugs.

    FE1E38D0-46BA-471C-817A-4719C3414F84.jpg
     
  22. Aug 12, 2022 at 12:19 PM
    #412
    Brynden29

    Brynden29 [OP] 2002 Tundra Limited

    Joined:
    May 16, 2020
    Member:
    #46632
    Messages:
    344
    Gender:
    Male
    First Name:
    Brynden
    Georgetown, Texas
    Vehicle:
    2002 Tundra Limited
    What would cause that? Too much fuel?
     
  23. Aug 12, 2022 at 12:19 PM
    #413
    FrenchToasty

    FrenchToasty The Desert rat, 6 lug enthusiast

    Joined:
    Sep 15, 2019
    Member:
    #36156
    Messages:
    15,435
    First Name:
    Mo
    The SoAz
    Vehicle:
    2006 DC 4.88s Elocker and some other trippy stuff
    None
    @Darkness
     
    shifty`[QUOTED] likes this.
  24. Aug 12, 2022 at 12:55 PM
    #414
    Jack McCarthy

    Jack McCarthy Truck repair enthusiast; Rust Aficionado

    Joined:
    Nov 2, 2020
    Member:
    #54409
    Messages:
    7,727
    Gender:
    Male
    First Name:
    Bill
    North of Boston
    Vehicle:
    02 Tundra AC SR5 V8 4x4
    That's a lot of misfires causing your spark plugs to foul in such a short period of time.

    I think early on somewhere in this thread saga, you said they were fine.
     
    BubbaW likes this.
  25. Aug 12, 2022 at 1:10 PM
    #415
    Brynden29

    Brynden29 [OP] 2002 Tundra Limited

    Joined:
    May 16, 2020
    Member:
    #46632
    Messages:
    344
    Gender:
    Male
    First Name:
    Brynden
    Georgetown, Texas
    Vehicle:
    2002 Tundra Limited
    So is it more likely that I have too much fuel in each cylinder? If the timing was off would that cause a misfire? I know I checked it 3 times, but it just seems like something isn’t right.
     
  26. Aug 12, 2022 at 1:28 PM
    #416
    dbittle

    dbittle Middle Age Member

    Joined:
    Aug 10, 2020
    Member:
    #50632
    Messages:
    227
    Gender:
    Male
    Huntsville AL
    Vehicle:
    2006 V8 RCLB 2WD
    Yeah, here's the road I'm mentally following. The fuel trim numbers are saying that the engine thinks it's really lean, so it's adding a bunch of extra fuel to compensate. It's not really lean, so the extra fuel is making the mixture too rich to burn very well (creating misfires). The evidence is the black carbon fouled plugs.

    So, if you had an vacuum leak upstream of the cylinders, you would have white or tan plugs because the mixture would really have been too lean and the engine was behaving correctly to add the extra fuel. Since that's not the case, either extra air is getting into the exhaust stream before the upstream oxygen sensors, or the sensors themselves are telling lies to the ECU. Could you have an exhaust leak from the headers, maybe the flanges aren't sealing properly or something?
     
    shifty` and Jack McCarthy like this.
  27. Aug 12, 2022 at 1:39 PM
    #417
    Brynden29

    Brynden29 [OP] 2002 Tundra Limited

    Joined:
    May 16, 2020
    Member:
    #46632
    Messages:
    344
    Gender:
    Male
    First Name:
    Brynden
    Georgetown, Texas
    Vehicle:
    2002 Tundra Limited
    I am following your logic, the problem is, it is misfiring before the o2 sensors have a chance to even warm up to start sending info to the ECU.

    I can check for an exhaust leak, but I think I would hear that if it was happening.

    I just checked the timing on the drivers side bank and it looks spot on. I really am at a loss on this one. I cleaned my air filter, I have an air raid intake, once it is dry I am going to go drive it some. Just to see how it does.
     
    shifty` likes this.
  28. Aug 12, 2022 at 2:08 PM
    #418
    Brynden29

    Brynden29 [OP] 2002 Tundra Limited

    Joined:
    May 16, 2020
    Member:
    #46632
    Messages:
    344
    Gender:
    Male
    First Name:
    Brynden
    Georgetown, Texas
    Vehicle:
    2002 Tundra Limited
  29. Aug 12, 2022 at 2:10 PM
    #419
    shifty`

    shifty` The Second Shortcoming of Christ

    Joined:
    Jun 20, 2020
    Member:
    #48239
    Messages:
    19,079
    ATL
    Vehicle:
    '06 AC Limited V8/4WD
    (see signature for truck info)
    Yes. And it looks like it's on the ports that aren't firing correctly.

    Didn't you say you have DD 12-holes?

    If yes, you may seriously want to consider cleaning up those plugs and reinstalling OEM, just to test.

    Edit: Although it absolutely could be that you're not getting good readings from your bank 1 O2 sensors, or anything @dbittle mentioned.
     
  30. Aug 12, 2022 at 2:16 PM
    #420
    Tundra2

    Tundra2 Zoinked

    Joined:
    Feb 10, 2019
    Member:
    #25875
    Messages:
    11,788
    Gender:
    Male
    First Name:
    Noah
    Western Kentucky
    Vehicle:
    '00 Tundra V8 SR5 '03 Corolla Virus
    I haven't been following along. What did you suspect was wrong with your throttle body?
     

Products Discussed in

To Top