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Advice needed. 1998 Toyota Tacoma-spark plugs+

Discussion in '1st Gen. Tacomas (1995-2004)' started by 3rdToyota, Nov 15, 2020.

  1. Nov 15, 2020 at 1:15 PM
    #1
    3rdToyota

    3rdToyota [OP] New Member

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    My 98 Tacoma, 209k miles) began knocking a bit and was hesitant on accelerating, so I decided to put in new spark plugs. I did not put in wires as my budget was zero. I opted for the Bosch irradiums. The guy at Advanced nAuto said they needed to be gapped at .040, and 3 were straight from the box. The other at .038, which I made to .040.
    Don't know what I did wrong, but it began "coughing' after warming up and idling at redlights. Called Advanced and others with the question about Gap. Some said .032, others .040, others still, .044. with all saying the difference was because I swithced to Irridium.
    I had to drive it that way a couple of days. Today, cold and windy, I pulled the plugs to recheck.
    They don't look right. The center electrode on all 4 is just a pencil point. And there was oil on the back one. What's a poor boy to do?
     
  2. Nov 15, 2020 at 1:17 PM
    #2
    Speedytech7

    Speedytech7 Toyota Cult Ombudsman

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    Well, Toyotas historically don't like Bosch ignition products. And v6 tacos require dual electrode plugs.

    Either a Denso 3194 or an NGK 3967 is what your truck should have.

    Welcome to TW :)
     
  3. Nov 15, 2020 at 1:19 PM
    #3
    Speedytech7

    Speedytech7 Toyota Cult Ombudsman

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    If you have a 4cyl you want

    Denso 3119 or NGK 2087

    But it sounds like you may have another issue to be honest
     
  4. Nov 15, 2020 at 1:43 PM
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    Knute

    Knute Well-Known Member

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    Check your Owner's Manual.

    It will specify which plugs you need and the correct gap.


    The guys at Autozone insisted I needed iridiums for my '06 V6 4.0L. I was doubtful, so I checked the manual. Turns out, I only needed simple copper plugs with a SINGLE electrode with a 0.040" gap. Got all 6 at Toyota dealer for $32 with tax.

    My point, know what you need before you go to a DIY auto store. The clerk only knows what is in the computer. Many times the "information" is marketing driven, may or may not be what is needed. No sense in coughing up more $$ than what you need.
     
    Last edited: Nov 15, 2020
    BillsSR5 and skeezix like this.
  5. Nov 15, 2020 at 4:15 PM
    #5
    3rdToyota

    3rdToyota [OP] New Member

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    Wow. Great response. I have the 4 cyl. and have decided to trash the iridiums and go back with OEM's. The manual only says to go with dual electrodes (or anything other than than OEM) if I had he 6 cyl. I will let you know soon. Damn little electrical connectors and CLIPS are a b***h aren't they.
    Anyway, here are the iridiums after >200 miles. The Oems have got me cranking fine, fires right up. And as long as I give it a little gas, it seems to idle alright. But take my foot off the gas and the shaking commences until she bogs down roughly.
    Just so everybody knows I got the NGK BKR5ES 2460 plugs. Think I'll call my mechanic tomorrow and just pay the bill.




    20201115_190413.jpg
     
  6. Nov 17, 2020 at 10:51 AM
    #6
    Knute

    Knute Well-Known Member

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    The plugs look a bit dark for 200 miles, but it is hard to read the plugs. It depends on how you did the engine cut.

    Anyhow, your idle issue is likely not related to the plugs. Many items can affect the idle. Sensors, MAF, throttle body, injectors.........
     
  7. Nov 17, 2020 at 11:34 AM
    #7
    AmherstAndy

    AmherstAndy Well-Known Member

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    Are you sure the "coughing" isn't a misfire? Has the CEL come on at all during this poor running? Even briefly? You could have easily screwed up a plug wire during removal.

    Alternatively, could you have forgotten to plug the MAF back in if you removed the intake plumbing (this would eventually trigger a CEL)? I don't think you have a vac leak because those plugs look sooty, like you're running rich, so it's probably a plug wire.
     
  8. Nov 17, 2020 at 11:39 AM
    #8
    AmherstAndy

    AmherstAndy Well-Known Member

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    Also, what's that (red circle)? Is the insulator cracked? If not, why is it so dirty after only 200 miles?
    20201115_190413.jpg
     
    Speedytech7 likes this.
  9. Nov 18, 2020 at 12:17 PM
    #9
    koco

    koco Well-Known Member

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    Around $26,000 worth of unleaded in the fuel tank.
    The 3.4l V6 has a decal on the timing cover stating that dual electrode spark plugs are imperative. The standard plugs from the dealership work fine; don't need iridium or anything special.
     

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