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2003 v6 misfire

Discussion in '1st Gen Tundras (2000-2006)' started by ramo510, Mar 30, 2021.

  1. Mar 30, 2021 at 9:55 AM
    #1
    ramo510

    ramo510 [OP] New Member

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    Hey Everyone,
    I have a 2003 v6 RCLB that I bought a few months ago. I got a great deal on it but since I have owned it I have always had a slight misfire that u can feel at idle. The car has only thrown a misfire code once. I have already in the last few thousand miles changed the timing belt, water pump, air filter, cleaned the MAF, spark plugs, wires, coils and the injector for cylinder 3 which is the cylinder that the misfire code indicated. Anyone have any suggestions what to check next?
     
  2. Mar 30, 2021 at 10:04 AM
    #2
    shifty`

    shifty` sub-80k mile club

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    I see you say you changed the coil for that cylinder specifically. The tube bodies often crack, allowing spark jump, thus misfire. Was the replacement new, and did you inspect it for cracks in the body?
     
  3. Mar 30, 2021 at 10:07 AM
    #3
    ramo510

    ramo510 [OP] New Member

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    Yes, I installed all 3 with new denso coils. The only thing that I didn’t replace all of was the injectors since they are so expensive I only replaced the injectors on cylinder 3 which is what the check engine light indicated was the cylinder that was misfiring
     
  4. Mar 30, 2021 at 3:19 PM
    #4
    Tundra2

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  5. Mar 30, 2021 at 3:21 PM
    #5
    ramo510

    ramo510 [OP] New Member

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    Yes, I used the dual electrode plugs
     
  6. Mar 30, 2021 at 3:32 PM
    #6
    Tundra2

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    To rule out a strange coincidence...

    Try swapping cylinder one and cylinder three coils just to rule out that you didn't get a bad new coil...

    long shot and would be a helluva coincidence that it'd be on the same one that was missing.
     
  7. Mar 30, 2021 at 3:35 PM
    #7
    Tundra2

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    Also, pull plug three and see if it's oily.
    May have leaking seals?

    I can't fathom a grounding issue only affecting one plug. I've seen stranger things happen.
     
  8. Mar 30, 2021 at 3:57 PM
    #8
    ramo510

    ramo510 [OP] New Member

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    Thank you for the suggestion. I actually already tried this and it still felt the same. No check engine light but just a slight miss at idle
     
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  9. Mar 30, 2021 at 3:59 PM
    #9
    ramo510

    ramo510 [OP] New Member

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    Thanks for the suggestion. I already did this I noticed more soot on the plug from 3 compared to the cylinder next to it but no oil.

    EA15802B-D4D7-4309-BFF7-F685CC84DE67.jpg
    ED2924A1-4556-43D4-8517-513482FB277B.jpg
    74B15254-6CF7-4B54-B5A2-32D25182B2C1.jpg
     
  10. Mar 30, 2021 at 6:01 PM
    #10
    Tundra2

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    We are on the same page now which is good.

    These are the new plugs? I'm not an engine expert, more of parts changer/mangler really...

    It looks pretty fouled. You may be able to brush off the residue, and get good spark from the plug but it will continue to be fouled until the conditions creating it are mended. This is beyond my scope now. Perhaps @empty_lord would be able to help more than I would.
     
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  11. Mar 30, 2021 at 7:32 PM
    #11
    ramo510

    ramo510 [OP] New Member

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    Yea, these plugs are only a few thousand miles old. Thank you for your insight and for tagging someone who might be able to help further
     
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  12. Mar 30, 2021 at 7:43 PM
    #12
    KNABORES

    KNABORES Not so new-ish Member

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    Fouling = incomplete combustion. Points to coil pack or injector problem, or less likely, head gasket problem.
     
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  13. Mar 30, 2021 at 7:55 PM
    #13
    empty_lord

    empty_lord They see me rollin'

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    a leakdown test would be the most logical step to make sure nothings wrong with cylinder 3 before proceeding
     
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  14. Jun 22, 2021 at 4:10 AM
    #14
    Tundra2

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    Report? Update?
     

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