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2004 Random multiple misfires 2,4,6,8

Discussion in '1st Gen Tundras (2000-2006)' started by WendyToo, Oct 23, 2019.

  1. Oct 23, 2019 at 1:01 PM
    #1
    WendyToo

    WendyToo [OP] New Member

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    Hi there! New here but haven’t had any major issues in almost 300k miles! But I need help now! Stranded in AZ and needing to be in Los Angeles this weekend! So, she (2004 Tundra, dual cab, 4.7L, almost 300,000 miles) started running a bit rough last week, but not bad. Drove about 300 mi, majority uphill, pulling a trailer and by the time I arrived, she was pretty rough and basically chugging up the hills. CEL was blinking. Oreilly’s checked the codes, tech didn’t know his way around the scanner and only said random misfire and couldn’t tell me which cylinder. Changed plugs, all pretty dark and dirty. Ran a little better, got back on the road and within 30 miles, was barely operable. Pulled over, checked plugs, cylinders 2,4,6,8 were dark and sooty like. Switched them to the other bank, switched coils to their opposite cylinder. Pulled Bank 2 downstream O2 sensor, cleaned it but since I was on the side of the highway, I didn’t attempt more. Limped 6 mi to local SMALL town. Oreilly’s again, ironically, same freaking tech! Cute kid, but clueless. Bought my own scanner, Codes P0300, 0302, 0304, 0306, 0308. After research, changed all plugs again, all coils, cleaned MAF, changed ALL O2 sensors. Myself. Started her up. Sounded awesome, purred like a kitten. For about 3 min. CEL back on, Codes 0300, 0302, 0304, 0306, 0308, but this time I also have P0174, System lean. I’m at my wits end. My next step was fuel filter, then I suppose I will have to figure out how to pay for a mechanic to check the timing belt, even though it only has 1500 or so mi on the belt. Any thoughts?
    Sorry so long but would rather get it all out as opposed to going back and forth with basic questions. Plus, I’m female and we can sometimes be verbose. Appreciate any advice, suggestions, criticisms, and donations lol Thanks in advance!!! Wendy
     
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  2. Oct 23, 2019 at 4:20 PM
    #2
    TX-TRD1stGEN

    TX-TRD1stGEN Privileged

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    Swap your o2 sensor in bank 1 sensor 1. Bet it's stuck lean!

    Each side had it's own cam pos sensor. Getting any code related to that??

    Option 3,. Plugged cat on bad side??
     
    Last edited: Oct 23, 2019
  3. Oct 23, 2019 at 4:30 PM
    #3
    BubbaW

    BubbaW Been Real

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    Along with TX-TRD questions, when was last time you changed or checked out your PCV valve....and Welcome to Forum.....safe travels after fixed !
     
    WendyToo[OP] likes this.
  4. Oct 23, 2019 at 5:03 PM
    #4
    TX-TRD1stGEN

    TX-TRD1stGEN Privileged

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    Guess it could have jumped timing on one side:notsure:
     
    WendyToo[OP] likes this.
  5. Oct 23, 2019 at 6:16 PM
    #5
    WendyToo

    WendyToo [OP] New Member

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    Man guys! Thank you so much for your replies!
    TxTrd- I changed all O2 sensors, most LOOKED okay, one, upstream sensor, Bank one, looked pretty rough, but they are all new now.
    No codes related to to cam sensor.
    BubbaW, thanks a million for the welcome! I have not checked the PCV valve. As much as I despise paying Oreilly’s prices, they are still open right now. Let me check it out. BRB!
     
  6. Oct 23, 2019 at 9:32 PM
    #6
    PCJ

    PCJ New Member

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    What brand of 02 sensors did you use? You could have a faulty new sensor. Denso is the best brand to stay with. You could also have a vacuum leak causing a lean condition or a sensor reading lean when it's not causing the cylinders to run rich to compensate.
     
    WendyToo[OP] and TX-TRD1stGEN like this.
  7. Oct 25, 2019 at 2:44 AM
    #7
    BubbaW

    BubbaW Been Real

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    FrenchToasty and WendyToo[OP] like this.
  8. Oct 25, 2019 at 10:06 PM
    #8
    keenxxx

    keenxxx New Member

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    Bank 2 is running rich if the plugs are sooted. A P0174 just means bank 2 oxygen sensor is sending a false low voltage output to the ECM which in turn increase the fuel delivery. A low 02 sensor output can be caused by a vacuum leak, craked exhaust manifold, faulty 02 sensor or wiring.
     
  9. Oct 26, 2019 at 2:14 PM
    #9
    WendyToo

    WendyToo [OP] New Member

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    Okay, update. Had it completely gone over by a mechanic. Checked timing, injectors, o2 sensors, PCV valve, blah blah blah. His diagnosis, catalytic converters, likely one side bad because while it was running, one side would get to temp and not so much on the other side. Just had both sides replaced...CEL just came back on.
    The only other thing that I can think it could possibly be is the ECM.
    The injectors are getting power though....
    @BubbaW The reason why I don’t think it’s bad gas is because it’s been filled a couple times since it started acting up....
    So frustrated.
    HELP!
     
  10. Oct 26, 2019 at 5:01 PM
    #10
    PCJ

    PCJ New Member

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    I think your mechanic fixed the consequence not the problem. If the engine is running rich it's going to affect the cat performance. He didn't fix what was causing it. A sensor could be in it's performance range and still be bad. As an example. Your temp sensor could be reading 120 degrees. That within it's normal reading range so it wouldn't throw a code but the engine would run rich because the ECM doesn't see it at operating temp. Just an example of why a good technician just doesn't look for codes but looks closer to what they read compared to what the engine is doing. And doesn't mistake the consequence as the problem.
    You need to have a better qualified mechanic check it out.
     
    GeezePlease and WendyToo[OP] like this.
  11. Oct 26, 2019 at 5:53 PM
    #11
    keenxxx

    keenxxx New Member

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    Your best option, @ this point, is to head to the dealer. Having a single bank fault means the diagnostics should focus on bank related components - vacuum leak,O2 wiring etc. You are wasting time & money blindly throwing parts and using shops w/o the skills for a proper repair.
     
    Last edited: Oct 26, 2019
    WendyToo[QUOTED][OP] likes this.
  12. Oct 26, 2019 at 10:50 PM
    #12
    WendyToo

    WendyToo [OP] New Member

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    @PCJ & @keenxxx
    Very valid points and both very true.
    Fortunately, the mechanic ruled out a lot of other things for me as well by doing a compression check, checking the injectors, tracing all the wiring, etc.
    The last (& ONLY!!!) code it is putting out is Bank 2 lean and I am 99% sure that it’s the downstream O2 sensor.
    Went ahead and had both catalytic converters replaced and drove 280 miles towing a 19ft trailer with absolutely no issues whatsoever. She’s running like a dream!
    I did try to take her to the dealer and was told it was a week wait before they could even begin to diagnose her.
    Muffler shop said that one side was full of silt and crud when he removed it.
    I’m okay with everything that was replaced. I’ve truly had to do minimum maintenance on her for almost 300k, so I can’t really bitch about new sensors, coils, plugs, etc
    Thank you all for all your help!! I’m already in Yuma now and headed to LA tomorrow!!
    :cheers::cheers::cheers::cheers:
     
  13. Oct 27, 2019 at 11:18 AM
    #13
    PCJ

    PCJ New Member

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    Glad she's running good and you are making it to your destination safely.
     
    WendyToo[OP] and MS22 like this.
  14. Aug 29, 2020 at 6:10 PM
    #14
    Scott04Tundra

    Scott04Tundra New Member

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    Hello Wendy
    Following up with your 04 Tundra, so how's it doing these days. Would you say replacing the cats was the main cure for the misfires. I just bought one with the same codes but it is still running well.
    Thanks
     

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