Spark plugs 2008 Taco 4.0L

Running Denso (4704)

$8 Denso (4704) IKH20TT Iridium TT Spark Plug, (Pack of 1)

IKH20TT Iridium on my 07 prerunner and never had a problem. Runs just fine. I would say pick what you like and stick with it.

 

I thought for certain a bunch of people would chime in saying they used iridium and had problems.

 

I've seen iridium cause problems on other manufacturers. Not toyota but enough problems to keep me from straying away from stock.

There may be some convenience to iridium lasting 100k. But how can you be sure the internal resistance "agrees" with the resistance of the ignition coil windings? What about the heat range? I don't pretend to know more than the toyota engineers. And I don't buy into the idea that "they use copper plugs to keep charging money for replacement every 30k". I'm also skeptical of gas mileage claims, usually mpgs have more to do with your right foot and tire size than plug selection

 

I got the platinum NGK 1483 in mine now. Regular copper plugs were not available when I went and they couldn’t tell me when they’d be available so I just settled for the platinum. They look odd with that tiny little electrode

Pushing 200k miles and this is the first time it sees these kind of plugs. Been about 5k miles and every thing seems normal

*edited*
Thought I had iridium but checked again and they’re copper with platinum tips

 

I agree. I change mine myself every 30k. They’re $4 apiece and takes me about 2 hours. So no biggie

 

Your ignition system is designed for the lower resistance of copper. No other metal except silver (used in race cars) has better performance. Notice I said performance and not longevity. Engines made for platinum or iridium have higher voltages to push the current across the gap. Yes, it’s possible to use P or I plugs in copper designed ignition systems but you have a higher probability of misfires. Copper is going to give you a good fat spark as designed.

 

Good man. Just happy to see you didn't get the "Genuine" Toyota plugs off Amazon/Ebay...that is, genuinely made & counterfeited in China.

 

My 2012 had about 50k miles when I changed them. And to my surprise one side had NGK and the other Denso. The Denso looked better.

 

I get mine at the dealership. Nowhere else.

 

How long are your naps between plugs? Lol

 

When I last changed my plugs ( at 122k), I found oil on the passenger side coil boots and a little on driver side, which means bad valve cover gaskets. So I changed those and the ignition coils with NGK coils. I needed to change my idler pulleys and assembly, and belt too as part of maintenance as I noticed they were noisy. The next week it was my alternator. Engine is running like brand new.

 

I’m certainly not breaking any records as far as speed goes . I get it done though

 

That’s what it’s all about..

 

What’s this MAF sensor look like? Is that something that should be part of preventative maintenance like the PCV valve I changed out recently?

 

Only 110K miles on our 2005 and I have put in new copper plugs 3 times since we bought it new

Yep, three of each seems to be standard procedure at Toyota. I replace mine with six Densos at each 30K change.

 

Back when I only maintained my own stuff, I thoroughly enjoyed doing it. I'd scrub every fastener removed with wd40 and a toothbrush, put it back in with anti seize or thread lock or thread sealer. Cleaned everything within arms reach of what I was working on, replaced anything I felt like a new one was needed.

Now that I maintain other peoples stuff for a living, it just feels like more work. I'm still more meticulace with my stuff than a customers.

I believe it's in the stickies, what to do, what not to do, what cleaner to use.

 

https://www.tacomaworld.com/threads/2nd-gen-diy-maintenance-quick-reference-guide.438945/

 

About 80k miles between naps
Hey, I never said I follow my own advice.

 

Lots of varied opinions on plugs so here is another that states iridium's are better so.....
13 Advantages and Disadvantages of an Iridium Spark Plug – Green Garage (greengarageblog.org)
Another
Iridium vs. Platinum Spark Plugs - In The Garage with CarParts.com
Another
Iridium Spark Plugs: Benefits & FAQs | RepairSmith
So all state less voltage and more durable and many advantages with only the cost a negative.
Manufacturers often use the cheaper option to save money plus 2gens are older and plugs have advanced over the years.
You all can read so make your own decision.

 

In terms of plugs. Yes, iridium is better.
In terms of performance, that’s not always the case.
Typically you won’t have any issues, but on occasion you will.
And the the 4.0 can be an “occasion”. Therefore, I try to advise people to stick to the OE plugs.