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Misfire after spark plug change

Discussion in '1st Gen Tundras (2000-2006)' started by Sangre Kid, Feb 23, 2020.

  1. Feb 23, 2020 at 12:11 AM
    #1
    Sangre Kid

    Sangre Kid [OP] New Member

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    Okay I have to admit right out of the gate that I got a Missfire code and neglected to note exactly which cylinders the code indicated.
    After getting the missfire code I installed new spark plugs. I put in a new PCV valve and installed the oem copper plugs. The old plugs were clearly needing to be replaced and the gap was at least three times that of the new ones. I checked the new plugs before installing and the gap was good. I believe the misfire codes were p0301 and p0305 but sadly I'm not 100%
    After installing the new plugs engine idles better and having unhooked the battery the code cleared. Drove truck that day and all seemed good. The next day in get the cel and missfire code again. This time I note the cylinders. P0305, and p0307.
    Thinking I may need coils too I swap the coils for 5 and 7 with 1 and 3. Clear codes and drive until they return. Misfire doesn't change cylinders, still getting p0305 and p0307. So tomorrow I am going to replace the plugs for cylinders 5 and 7 again as well as clean the throttle body, check the air filter and add an injector cleaner through the fuel system. What I'd like to know, is are there any other obvious things I should look at checking while I'm doing these things? Anyone have ideas other than the things I've mentioned as to what could cause two cylinders right next to each other on drivers side to misfire?
     
    Last edited: Feb 23, 2020
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  2. Feb 23, 2020 at 1:16 AM
    #2
    TTund16

    TTund16 New Member

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    Doesn't sound like the spark plugs are the problem since you have already changed them once.
    how many miles on the car?
     
  3. Feb 23, 2020 at 1:20 AM
    #3
    Sangre Kid

    Sangre Kid [OP] New Member

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    Truck has 168,xxx. I don't think it's the plugs either, but I have read a few posts other places that end with the new plugs being the problem. Since they're cheap and easy to change, I'm going to just check that box while I have the hood up
     
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  4. Feb 23, 2020 at 6:04 AM
    #4
    Professional Hand Model

    Professional Hand Model A.K.A ‘Golden Hands’

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    Watching this. Hope it can get resolved.
     
  5. Feb 23, 2020 at 6:36 AM
    #5
    TX-TRD1stGEN

    TX-TRD1stGEN I'm not taking a knee

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    Are you sure they didn't get plugged in backwards or something?

    Have to asko_O
     
  6. Feb 23, 2020 at 7:39 AM
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    johnnyskullface

    johnnyskullface New Member

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    You have taken really smart steps so far. Check the intake manifold for maybe looseness, a damaged gasket, or maybe even something pinched between it near those cylinders. Unmetered air sneaking in would cause a misfire.
     
  7. Feb 23, 2020 at 7:43 AM
    #7
    lsaami

    lsaami Let ‘er buck

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    Strange. If swapping plugs doesn’t fix it, I’d look at fuel injectors and intake manifold gaskets.
     
  8. Feb 24, 2020 at 12:12 PM
    #8
    Darkness

    Darkness Allergic to white

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    If the miss does not follow then I'd start looking for vacuum leaks like @johnnyskullface said, those will cause misfires.
     
  9. Feb 24, 2020 at 1:22 PM
    #9
    YotaManSD11

    YotaManSD11 New Member

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    It may be a good idea to replace air filter and clean your MAF sensor while you are cleaning up your throttle body.

    Good luck!
     
  10. Feb 24, 2020 at 6:18 PM
    #10
    Sangre Kid

    Sangre Kid [OP] New Member

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    @TX-TRD1stGEN would you clarify what you mean by 'plugged in backwards'?
    I appreciate the suggestions @johnnyskullface I'll put those at the top of my list if today's steps don't solve it.
    My post is part hoping one of the smarter more experienced members leads me to ideas and part for the benefit of others. This site has been so helpful to me since buying the truck about 6 months ago.
    @FirstGenVol has a 'single stage paint correction' thread that took me from liking the used truck I bought to loving it in one day.
    @empty_lord and @Professional Hand Model have posted tons of helpful info for those wanting to learn more about the 1st gen Tundra.
    There are a lot more of you guys like @Darkness and several who I know I'm forgetting but I gotta say that guys like me appreciate the HELL out of what you share.
     
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  11. Feb 24, 2020 at 6:52 PM
    #11
    empty_lord

    empty_lord They see me rollin'

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    If the mis doesn’t move with coils or plugs I’d go compression test and if that’s good (should be), look into injectors. Vacuum leak, while possible, will rarely affect just 2 cylinders. If you have access to a scan tool with live data the long term and short term fuel trims should show a vacuum leak in the way of excessively high trims. (Ideally you want short and long to add up to -5-5%)
     
  12. Feb 24, 2020 at 6:54 PM
    #12
    empty_lord

    empty_lord They see me rollin'

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    5-7 are next to each other too. Compression test would be my next go to just to make sure your not tossing money away, if you swapped wires by accident the engine would run horribly, so i doubt that’s a issue
     
  13. Feb 25, 2020 at 6:31 AM
    #13
    Professional Hand Model

    Professional Hand Model A.K.A ‘Golden Hands’

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    Maybe a crack between the two pistons gasket?
     
  14. Feb 25, 2020 at 7:55 AM
    #14
    empty_lord

    empty_lord They see me rollin'

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    That’s the very possibility I’d want to rule out before throwing parts at it
     
  15. Feb 25, 2020 at 8:09 AM
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    Sangre Kid

    Sangre Kid [OP] New Member

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    SOLVED!
    ...at least I think/hope.
    After my efforts on Sunday, I still didn't have an answer. I called my buddy who recently got his master cert as a toyota tech. Brought it to him with the list of stuff I'd done already. At this point I was praying it was something I had carelessly done wrong because the list of cheap fix things that it could be was getting pretty short. I was pretty certain it hadn't jumped a tooth in timing because 1)It was only 2 cylinders misfiring
    2)It didn't seem to misfire at higher RPM's while in park (not under load)
    3) He had just helped me replace the belt about 4 months ago and we did tensioner and pulleys too

    So I'm starting to dread the intake manifold gasket or worse as the answer.

    He starts by checking my work, because ya know incompetent customers account for at least a third of their business
    We determine that its not actually both 5 and 7 but only 7. He explained that often cheaper code readers will register both the misfiring cylinder and it's "buddy" cylinder.
    We then swapped the injectors for 5 and 7. For those planning to pull injectors I suggest having replacement o-rings on hand. 3 of the 4 injectors that we pulled became damaged when we reinstalled them (rubber was just old and brittle)
    Once we got all the injectors back in and checked for any leaking fuel, (another nice thing about his high end equipment was he could turn on the fuel pump with it and not have to start the truck) we start the truck and under load the misfire finally registers. It has moved to #5.
    Shop didn't have injectors in stock, neither did any of the parts stores near me, so tonight I'll be installing the new one.
    Hopefully that cures it. Stay tuned...
     
  16. Feb 25, 2020 at 8:16 AM
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    TX-TRD1stGEN

    TX-TRD1stGEN I'm not taking a knee

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    That's good news. Thanks for keeping us updated!:thumbsup:
     
  17. Feb 25, 2020 at 8:51 AM
    #17
    empty_lord

    empty_lord They see me rollin'

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    Don’t skimp on injectors! Inter motor is worth it. It’s rebranded oems. Cheap injectors can cause a whole other world of problems
     
  18. Feb 25, 2020 at 9:45 AM
    #18
    Professional Hand Model

    Professional Hand Model A.K.A ‘Golden Hands’

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    Awesome feedback. I think many of these code threads get confusing due to ‘El Cheapo’ diagnostic tool/devices based on your buddies experienced feedback. What diagnostic tool did your buddy use?

    Reman’d injectors come with 12 ports if you desire. They are a nice upgrade. I did all of mine last year for just over $300. Might be worthwhile for you.

    Incompetent customers? Hahaha. I love it.
     
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  19. Feb 25, 2020 at 11:00 PM
    #19
    Sangre Kid

    Sangre Kid [OP] New Member

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    Update. A new injector was the answer. @Professional Hand Model I actually don't know the model or brand of device that he used. I asked about it and he said the dealership gives them one when they pass the master tech cert. I asked how much they go for and he said about $12,000 so I moved on
    @empty_lord I did go with an inter motor injector, not cheap at about $140 but I agree it's not a part to skimp on. Interesting thing buddy mentioned is that the injectors very rarely go bad. In fact this was the first one he'd seen go bad on a 1st gen tundra.
    At some point this summer I do plan to upgrade the injectors to the 12 hole remanded ones. They're sold by Dirty Deeds correct?
     
  20. Feb 25, 2020 at 11:02 PM
    #20
    empty_lord

    empty_lord They see me rollin'

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    I can confirm in the 6 years at a Toyota dealer, we’ve never replaced 4.7l injectors. Rare to see them fail. But they definitely can.
     
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  21. Feb 26, 2020 at 3:02 AM
    #21
    BubbaW

    BubbaW Saw it right off

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    I'd be interested in knowing this also. @empty_lord if you don't mind saying, do ya'll use the real version/setup of Techstream. Also, what other diagnostic OB2 due you personally use for basic checks, whether it be at work or personal, if you don't mind saying.
     
  22. Feb 26, 2020 at 4:08 AM
    #22
    Professional Hand Model

    Professional Hand Model A.K.A ‘Golden Hands’

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    Yes. Dirty Deeds.

    That High Dolla diagnostic tool is the key. I suspected it would be in the $6-12k range.
     

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