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Spark plug question

Discussion in '1st Gen. Tacomas (1995-2004)' started by Nessal, Apr 30, 2021.

  1. Apr 30, 2021 at 3:20 PM
    #1
    Nessal

    Nessal [OP] Well-Known Member

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    I just purchased the OEM Denso plugs at the dealership for the 3.4L V6 and the gaps on all of the plugs were 0.034". I've been reading conflicting information on what the gap should be. Some people say that the gap should be 0.044" on both prongs and some people say that it should be 0.022" on each side adding up to a total of 0.044".

    Does anyone know definitively what it should be? Thanks.
     
  2. Apr 30, 2021 at 3:23 PM
    #2
    0xDEADBEEF

    0xDEADBEEF Well-Known Member

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    What PN did they give you?
     
  3. Apr 30, 2021 at 3:24 PM
    #3
    Nessal

    Nessal [OP] Well-Known Member

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  4. Apr 30, 2021 at 3:28 PM
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    0xDEADBEEF

    0xDEADBEEF Well-Known Member

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  5. Apr 30, 2021 at 3:39 PM
    #5
    Nessal

    Nessal [OP] Well-Known Member

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  6. Apr 30, 2021 at 3:39 PM
    #6
    0xDEADBEEF

    0xDEADBEEF Well-Known Member

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    They're pre-gapped out of the box, and you're not supposed to regap them. So, I don't. :laughing:
     
  7. Apr 30, 2021 at 3:48 PM
    #7
    Nessal

    Nessal [OP] Well-Known Member

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    Actually, I just looked at the plug and it's the correct denso number but the gap is different.
     
  8. Apr 30, 2021 at 3:56 PM
    #8
    Winkle99

    Winkle99 Don't Look Back

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  9. Apr 30, 2021 at 4:09 PM
    #9
    Nessal

    Nessal [OP] Well-Known Member

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    Thanks. For some reason my gap are all 0.034"....yes all 6 plugs from the dealer. I'm going to adjust the gap on each side to 0.043" as specified in the manual. I checked the part number on the plug and it matches what you all are using except the gap is super off. I verified this with two different sets of feeler gauges and come back with the same result.
     
  10. Apr 30, 2021 at 4:26 PM
    #10
    knayrb

    knayrb Well-Known Member

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    This engine is what is called a wasted spark. You’ll notice that there are only 3 coils with a cable from each running over to the drivers side. It generates a spark on the exhaust stoke which is wasted. For that reason there are 2 electrodes to spark. The spark only hits the side which is closest. As that wears down it will hit the other side. It keeps doing this until the plug wears out. In theory it will last as long as a single electrode plug in a non-wasted spark engine. Gap both sides the same.
     
    Nessal [OP] and ekul310 like this.

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