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Multiple misfires after rebuild

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

  1. Sep 15, 2022 at 7:08 PM
    #571
    FrenchToasty

    FrenchToasty Desert rat, 6 lug enthusiast

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  2. Sep 15, 2022 at 7:15 PM
    #572
    shifty`

    shifty` Push the envelope. Watch it bend.

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    upload_2022-9-15_22-15-14.jpg
     
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  3. Sep 15, 2022 at 7:55 PM
    #573
    NickB_01TRD

    NickB_01TRD You don't need less cars, just more driveway.

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    @Brynden29 I'd say roll with the coil packs but get the proper denso sparkplugs from rockauto or a local parts store.
     
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  4. Sep 15, 2022 at 8:22 PM
    #574
    Brynden29

    Brynden29 [OP] 2002 Tundra Limited

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    Which plugs should I get?
     
  5. Sep 15, 2022 at 8:26 PM
    #575
    NickB_01TRD

    NickB_01TRD You don't need less cars, just more driveway.

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    Denso K20R-U is what I got for my 01
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  6. Sep 16, 2022 at 4:59 AM
    #576
    shifty`

    shifty` Push the envelope. Watch it bend.

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    And only for reference sake to confirm what Nick is saying, this is taken directly from the '02 owner's manual that's here on the forum. You've got two options. Gapping is below the recommended plugs.

    upload_2022-9-16_7-59-9.jpg
     
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  7. Sep 24, 2022 at 9:27 AM
    #577
    Brynden29

    Brynden29 [OP] 2002 Tundra Limited

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    Here are the drivers side plugs (misfire side):
    3FC5CD90-AC88-4801-9D42-D25C3D223E86.jpg

    Here are the passenger side plugs (working side):
    F1BD78BB-3C41-4F5E-AC5F-797DFB610CE4.jpg

    They all look good to me.
     
  8. Sep 24, 2022 at 9:38 AM
    #578
    Brynden29

    Brynden29 [OP] 2002 Tundra Limited

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    I just did a cold compression test:

    1 - 210
    2 - 210
    3 - 204
    4 - 195
    5 - 198
    6 - 215
    7 - 215
    8 - 210
     
  9. Sep 24, 2022 at 10:27 AM
    #579
    Brynden29

    Brynden29 [OP] 2002 Tundra Limited

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    I swapped the ECU back to my stock one. When it first started I was only getting misfires on 1 & 3. Once the STFT went negative it started missing on all the cylinders. I hooked a vacuum gauge to the intake manifold:

    910E2F5B-6F49-4169-9315-60C7015BBABB.jpg

    I don’t know how much vacuum I should have at idle. Here is a video of the gauge:

    https://youtube.com/shorts/1zkrxs6OrFU?feature=share

    Thoughts?
     
  10. Sep 24, 2022 at 10:55 AM
    #580
    Brynden29

    Brynden29 [OP] 2002 Tundra Limited

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    I also hooked up the exhaust back pressure tester to the drivers side upstream o2 port. It was right about 0 but when I reved it up and let off it actually went negative. So I assume it is very free flowing? Should there be some back pressure at idle? If there isn’t could that mean and exhaust leak at the manifold? I know that I tightened the nuts down but they were the original nuts and I don’t know if I should have replaced them. Thoughts on that too? Thanks guys.
     
  11. Sep 24, 2022 at 10:57 AM
    #581
    Brynden29

    Brynden29 [OP] 2002 Tundra Limited

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    One other thing, I just took it for a drive and the STFT were very low:

    3F6AF7D5-6129-4D0E-B8AF-B49EB1C3C3C7.jpg

    I hadn’t driven it enough to calculate a LTFT when I took this picture.

    what could be causing the ECU to pull so much fuel?
     
  12. Sep 26, 2022 at 5:33 AM
    #582
    shifty`

    shifty` Push the envelope. Watch it bend.

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    Vacuum is definitely one thing I'd brought up - mostly because the 'happens at idle, not at load' is a typical sign of vacuum leak.

    Other members have mentioned potential for exhaust leak causing this, and it makes logical sense it could be the cause.

    IIRC, you mentioned using the gaskets that JBA supplied with the headers, right? If it were me, I'd have gone with new hardware, but usually it's because exhaust hardware ends up being rusty as hell/degraded by the time I'm swapping headers, and I just want fresh bolts. :rofl:

    Either it believes it's burning lean (i.e. O2 is reading lean on that bank when actually not, or pulling outside oxygen after combustion, but before pre-cat O2?) or it believes it's pulling in way more air than it actually is (bad MAF, bad TPS?) would be the two big ones I can think of.
     
  13. Sep 26, 2022 at 7:08 AM
    #583
    Brynden29

    Brynden29 [OP] 2002 Tundra Limited

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    Thanks for the replies. I am sure you are tired of this, as am I.

    I used the JBA gaskets, but the nuts and bolts are stock that I reused. The bolts all stayed in when I took the stock exhaust manifolds off. I reused the nuts, but I am thinking maybe I need to get new ones.

    I did replace the maf sensor (I bought a hitachi one from Amazon for $71.66) and I assume the TPS sensor lives in the throttle body, which is brand new also.

    If there was a maf issues why would only one bank be affected? The intake manifold feeds both banks equally. That doesn’t make a lot of sense to me.
     
  14. Sep 26, 2022 at 7:39 AM
    #584
    shifty`

    shifty` Push the envelope. Watch it bend.

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    At this point, I'd just like to see some success, wouldn't you? :rofl: (that's rhetorical)

    I assume you'd want to stick with the JBA because they're made for their LT headers and don't necessarily match stock. But I really don't know. Bolts are easy enough to swap. Pop out and swap one at a time, torque to spec, then (I like to) go back over with two random passes, usually in a 1-3-2-4 style pattern to confirm torque. FSM may say something different, this is just how I've always done it since I was a teenager and never had issues.

    Exactly. Neither would TPS. I was just tossing out the two cases I could figure OTOH that would explain it.
     
  15. Sep 26, 2022 at 2:55 PM
    #585
    dbittle

    dbittle New Member

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    The plugs definitely don't look like the mixture is too rich on bank 1, so to me that puts the spotlight firmly on something being jacked up in the O2 sensor system on that side. It could be something like a bad ground connection, not just a bad sensor itself.
     
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  16. Sep 26, 2022 at 8:17 PM
    #586
    Tundra2

    Tundra2 Zoinked

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    This makes me think!!! Do you have any reputable shops that do harness testing?

    I had a ground issue on my truck that I simply couldn't find... I was missing a ground on one of the upstream 02 sensors that kept making my trucks fuel system go into Open Loop. I took it to a shop that tested the entirety of the wiring harness, and found that there was a ground disconnected somewhere in the circuit of that oxygen sensor. I swapped ECUs, changed sensors, and just about everything before I broke down, and plopped the truck off at the shop. They had it fixed in a few days.

    Just a thought for you. Might be worth pursuing.

    Heres a link.
    https://www.tundras.com/threads/crackhead-resurrection.94083/page-57#post-2641393
     
  17. Sep 26, 2022 at 8:37 PM
    #587
    Brynden29

    Brynden29 [OP] 2002 Tundra Limited

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    I will say, the wiring harness I am using is the one I bought from an online junk yard. I assume that it is good, all the connectors look way better than my old broken ones.
     

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