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How To: Replacing Spark Plugs and Wires on 5VZ-FE 3.4 V6

Discussion in '1st Gen. Tacomas (1995-2004)' started by TacomaJPP, Jan 31, 2013.

  1. Dec 9, 2018 at 10:16 AM
    #141
    970btu

    970btu Well-Known Member

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    Thank you for this!
     
  2. Dec 21, 2018 at 1:05 PM
    #142
    NCrob

    NCrob Active Member

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    Appreciate you taking the time to post this!
     
  3. Mar 21, 2019 at 12:28 PM
    #143
    samizman

    samizman Active Member

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    Kick ass thread! Just put in my NGK wire set and new Denso plugs and this was a great reference!
     
  4. Mar 25, 2019 at 11:20 AM
    #144
    BD47

    BD47 Member

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    Thank you very much for the write up and all the visual aids!!!
     
  5. May 18, 2019 at 3:42 PM
    #145
    Old Grey Goat

    Old Grey Goat New Member

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  6. May 18, 2019 at 4:35 PM
    #146
    Old Grey Goat

    Old Grey Goat New Member

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    On the subject of plug gap. I got into the habit of checking plug gaps when I was a kid on my gokart and my first car. I also look at plugs with a magnifying glass sometimes just to see if they have any imperfections like cracks or bad quality and no I don't have a pocket protector on my shirt. I've played around with side gapping spark plugs and heat ranges on some of my engines. Well I was just checking the gap on my plugs for the Tacoma and checked this forum for specs and saw all the to gap or not to gap and people seeing small gaps out of the box and yes mine looked small also. I took a look through my magnifying glass and noticed the side eletrodes are machined or cut to match the round center electrode. It was a huh check that out moment. So if you are running the Denso dual side electrode plugs you might just want to run them right out of the box unless you see something real obvious. I added a crewed drawing and some pictures of how you could get a different gap measuring straight across and not in the middle with a wire feeler gauge. DON"T USE THAT ROUND KEY CHAIN GAUGE !!! This forum has great info and great members and I hope this helps someone.
     
  7. Jun 12, 2019 at 9:43 PM
    #147
    Cutter_

    Cutter_ I probably could have googled this

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    Stupid question but why are there only 4 spark plug wires when there are 6 spark plugs?

    resource.jpg
     
  8. Jun 12, 2019 at 10:48 PM
    #148
    eon_blue

    eon_blue woke up and chose naproxen

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    Are you looking at the 4cyl diagram?

    From the 1st page

    EngineCylinderAssignment_zps740e38b6_8e7d36a7b57a675a12b13b4819f116dce0f946aa.jpg
     
    Last edited: Jun 12, 2019
  9. Jun 13, 2019 at 9:02 AM
    #149
    Old Grey Goat

    Old Grey Goat New Member

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    Hey Cutter
    I believe they are firing those coil packs twice which means that if it's firing number one on the compression stroke or power stroke it's firing number four on the exhaust stroke. I'm sure you know that all the coil packs are on the passenger side of the engine. It helps clean up emissions but if you have a bad coil pack you lose two cylinders and have one dirty running engine. I've noticed this engine is a lot like my old 82 Yamaha motorcycle. Four cylinders two coils and if you look at the valve adjustment they use valve shims like my Yamaha a total motorcycle thing. So that's my thought and I hope it helps.
     
  10. Sep 15, 2019 at 11:06 AM
    #150
    MamaTried81

    MamaTried81 Well-Known Member

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    Thanks for this write up!

    Just swapped out the original wires, dated 2001. They were still doing fine at 111k miles, but I put some fresh ones in just the same.

    OEM wires were well worth the extra coin. They came all rigged up with all the spacers and clips. Went right on, no fuss.

    Plugs weren’t terribly worn, but they’re so cheap I figured I’d do them while I’m in there.

    1681EDB5-137A-41B3-8429-C45B9F462CBF.jpg
    14BC2993-0236-44F9-A1A6-A2F436DF8C96.jpg
     
  11. Apr 4, 2020 at 8:34 AM
    #151
    trdracing5

    trdracing5 Well-Known Member

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    Just did this. Can't believe how easy it was.
    Truck had the sumitomo wires and Denso/NGK combo plugs so I assume these were original.
    Might have been time for a change since the factory combo appears to have lasted 17 years and 160,000 miles.
    Wasn't having any issues with the truck but it does seem to run a little bit better now (plus the new blue NGK wires kind of look cool).
     
    underaroof likes this.
  12. May 5, 2020 at 6:37 PM
    #152
    JSH3.4

    JSH3.4 Active Member

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    Not related to this thread, just has a good picture.

    Does anyone know what to call the small white hose fitting thingamajig straight to the left of the word PRY in this pic?
    Or where to get one?
    Or how to remove it?

    I broke off the fitting part of it while working with my air intake.

    Thanks.
     
  13. May 6, 2020 at 2:26 PM
    #153
    JSH3.4

    JSH3.4 Active Member

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    Ok, just didn't want to mess up something taking it out
     
  14. May 30, 2020 at 9:28 AM
    #154
    Madjik_Man

    Madjik_Man The Rembrandt of Rattle Can

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    Spark plug gap spec = 0.043
    Most spark plug wire vapored only have 0.040

    Is that “good enough?” I figure the 0.003” difference is probably somewhere in the tolerance range of the tool or electrode itself.

    Or better yet does anyone know where to get a wire gap tool with 0.043? @scocar has one (saw a pic of it in a thread somewhere) but he has no idea where he got it from :)
     
    scocar likes this.
  15. May 30, 2020 at 10:51 PM
    #155
    scocar

    scocar Prebunking

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    Correct, I have no idea where I got it from.

    I just searched the F out of it 15 different ways and the closest I ever saw was .044, but I think it was for the wire hoop type, not the L type.

    I found a Denso too in the UK, but it didn't' even provide the spec on it!

    So I say use the L types that are easier to find with .040 and that is close enough.
     
  16. Jun 11, 2020 at 1:25 PM
    #156
    Whitelife

    Whitelife Member

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    Nothing yet
    Anyone ever try using the Platinum series of these spark plugs? Denso 3289
     
    Last edited: Jun 11, 2020
  17. Jan 2, 2021 at 7:27 PM
    #157
    mistafier

    mistafier Well-Known Member

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    Oh man, I'm so glad to see this info. I discovered this same exact thing yesterday, when I got curious about whether or not the plugs i got from my local dealer were, in fact, pre-gapped. The round gauge was producing numbers that I didn't like, and long story short after looking at how the dual ground was shaped, I ended up at Oreilly's for a different style of gauge. Issue solved! So nice to have my pocket-protector-wearing journey into spark plug gapping confirmed by your post. And so glad you posted this here, to finally bring some clarity about The Great Gapping Dilemma to this awesome thread, even if it did take 8 pages to get there, hahaha! Nice work. :cheers:
     
  18. Mar 4, 2021 at 7:18 PM
    #158
    Oldman71

    Oldman71 New Member

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    Excellent post..Thank you!
     
  19. Apr 1, 2021 at 10:43 AM
    #159
    UCPA111

    UCPA111 Active Member

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    Looking to change out spark plugs, plug wires and coils on my new to me 2002 with 3.4L v6. 120,000 miles on the motor. Just want to be proactive and setup for another 100,000 miles.
    Recommendations on plugs, wires and coils?
    6 plugs, 6 wires, 3 coils....right?
    Coils have quite a price range. Should I go for the $80+ versions or what?

    Thanks in advance for any support.
     
  20. Apr 1, 2021 at 10:47 AM
    #160
    se7enine

    se7enine MCMLXXIX

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    Denso or NGK. Not from the dealer unless they are cheaper which usually isn't the case.
     

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