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Are the 3 coil packs on the 3.4L interchangeable? Help please.

Discussion in '1st Gen. Tacomas (1995-2004)' started by mistafier, Jan 2, 2021.

  1. Jan 2, 2021 at 3:44 PM
    #1
    mistafier

    mistafier [OP] Well-Known Member

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    Hey e'rybody! Engine newb here. Are the coil packs interchangeable?

    I'm in there doing VC gasket and engine tune-up. I'm having to reroute the plug wires bc whoever was in there previously had them all switched around. I'm using the FSM, and I have the wires, boots, packs all matched up according to the FSM diagram. (1-4, 3-6, 2-5). Before I plug them in and eventually start the truck, I just want to double-check that the 3 individual coil packs themselves can be interchanged between cylinders 1,3,5 - because I'm not really sure which pack was attached to which cylinder when everything got taken apart (my buddy helped me, and he was moving too fast before I could get things labeled).

    Thanks!
     
  2. Jan 2, 2021 at 3:46 PM
    #2
    TacosConQueso

    TacosConQueso Well-Known Member

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    Not positive but I think they all have the same PN (so they would be interchangeable), not sure why they would be cylinder specific
     
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  3. Jan 2, 2021 at 3:47 PM
    #3
    Bishop84

    Bishop84 Well-Known Member

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    Yes interchangeable. The wires are not.
     
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  4. Jan 2, 2021 at 3:53 PM
    #4
    mistafier

    mistafier [OP] Well-Known Member

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    ok. what do you mean when you say the wires are not? I know that each of the 3 wires in the set has to run between two specific cylinders. But are there identifying marks on the wires/boots (such as cylinder numbers or something) that tell me which wire goes to which cylinder? I noticed that there was a "G" on one, and on the two others there is a "1". Not sure what that means.
     
  5. Jan 2, 2021 at 5:13 PM
    #5
    Wyoming09

    Wyoming09 Well-Known Member

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    Because of the wire length to the spark plugs
     
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  6. Jan 2, 2021 at 5:29 PM
    #6
    mistafier

    mistafier [OP] Well-Known Member

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    I understand that about the wire lengths. Let me ask this a different way, bc i'm nut sure if I'm being clear about my issue.

    Are the wires marked with cylinder numbers? I don't see any markings on them. If they are not marked, do I just go by their length? To be clear, these current wires were never removed from the coil packs when we took everything off for the VC gasket job. What I'm saying is that I'm not sure that I reinstalled the coil packs back into their original tube holes (because I don't actually know which holes they came out of bc my buddy just starting yanking shit out when we disassembled everything before I could label things :().
    Is each of the 3 spark wires in the set specific to a pair of cylinders, OR is each wire generic (other than length) and I'm good so long as I run each wire correctly between each cylinder pair (so long as the wires reach)?

    Thanks for bearing with me, I'm just trying not to blow up my engine or something lol.
     
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  7. Jan 2, 2021 at 5:37 PM
    #7
    Wyoming09

    Wyoming09 Well-Known Member

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    Wires are electrically close enough the only real difference is the length

    They are all close in length just some are a better fit
     
  8. Jan 2, 2021 at 5:47 PM
    #8
    mistafier

    mistafier [OP] Well-Known Member

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    ok cool. That's what I was thinking too. I'm reinstalling these old ones for now, just to get the truck running again. I'm waiting on some new blue NGKs to arrive in a few days.
    I'm wondering if the new NGK ones will be "marked" so to speak, or if they are installed according to lengths.
     
  9. Jan 2, 2021 at 5:50 PM
    #9
    Dm93

    Dm93 Well-Known Member

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  10. Jan 2, 2021 at 5:52 PM
    #10
    gotoman1969

    gotoman1969 Well-Known Member

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    The coil packs can in any cylinder you choose, the wires need to go back on the cylinder correctly. Ie. The wire from the coil on #1 has to go back to the correct cylinder 2,4 or 6. Etc, etc.
     
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  11. Jan 2, 2021 at 6:11 PM
    #11
    mistafier

    mistafier [OP] Well-Known Member

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    Thanks. I have this diagram already, and I understand the pairings between cylinders. I feel like I'm about to beat my own question to death, but here goes again:
    For example - A wire runs between Cyl 1 and 4. Ok, so let's say that wire was removed and used to connect Cyl 3 and 6 instead. Would that be ok (so long as it reached lengthwise)? I'm trying to find out if each individual wire is specific to a cylinder pair. Maybe it is, hence the different lengths of each wire in the set. OR, is EACH of the 3 wires interchangeable and would work between any cylinder pairs, so long as they reached?
    Anyhoo, my question and my worrying are probably moot, since the wires are 3 different lengths and I guess can ONLY reach between the appropriate pairs. Right now, i have everything matched up with the correct cylinders and everything fits, so I guess I'm good. That seems to be what @Wyoming09 is saying, especially since each wire is electrically the same (similar).
     
  12. Jan 2, 2021 at 6:14 PM
    #12
    Dm93

    Dm93 Well-Known Member

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    Wires are all the same other than length, coils are all the same. As long as they are routed correctly and you have the coils plugged into the correct connectors on the engine harness you are good to go.
     
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  13. Jan 2, 2021 at 6:24 PM
    #13
    mistafier

    mistafier [OP] Well-Known Member

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    Awesome, thanks guys! I have the wires running between the appropriate cylinder pairs, so I'm moving on. Thanks for bearing with me. I'm learning a shit ton on this VC and shim job. I'm sure I'll have a few more questions before it's all said and done. Happy new year!
     
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  14. Jan 3, 2021 at 7:09 AM
    #14
    Wsidr1

    Wsidr1 Well-Known Member

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    Just looking at few examples on Amazon, the product description for NGKs says they are numbered.
     
  15. Jan 3, 2021 at 8:10 AM
    #15
    mistafier

    mistafier [OP] Well-Known Member

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    Cool, yeah I saw that. Hoping they are when they arrive. For now, I’m putting the old wires back on (routed and paired correctly), and hoping for the best until the new ones come in. They worked before, so they are probably fine for now. Only thing is I nicked them a little bc they got caught on something in the bay during the engine tune-up. I put some electrical tape on the nicked part.
    Thanks!
     

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