NGK Iridium plugs...

Hi,

I have tested Iridium spark plugs in 2 Yamaha motorcycles: in both of them, there was a difference indeed; improvement in power, and less motor heath.

Any one has tested these plugs, like NGK iridium, in a Tacoma ? besides more durability, any difference/change in motor performance, mpg?

 

stick with the recommended Denso plugs on the V6 4.0L and change them every 30k miles.

 

What does your truck's (your year) Owners Manual say?

For the best performance to get out of your truck's engine, I highly suggest that you always go with (stick with) what the Owners Manual says to use.

Who else would know what are the "best" parts, for maintenance and performance, to use with your truck but the manufacturer, right?

The Owners Manual should give you a choice between NGK or DENSO, should also list the part numbers for both as well as the spark plug gap recommended.

My Owners Manual list both NGK and DENSO and that's all I use. Using or 'experiementing' with any other type/brand of spark plug could cause more harm to your engine rather that do better for it.

It's your call and risk?

Read (refer to) your Owners Manual-for 'everything'.

 

Thank you for your comments

I found these, interesting:

• https://www.tacomaworld.com/threads/my-experience-with-installing-iridium-plugs-in-v6.136409/
• https://www.tacomaworld.com/threads/trd-iridium-spark-plug.179923/#post-3797294

 

I tried some NGK iridiums because I got them almost brand new from a friend of mines car for nothing. My truck absolutely hated them. Maybe it'd be different with a 4.0 but I can say the 2.7 wasn't happy about it. For me I'd just go with OEM.

 

Not sure what year they started, but the 2.7 liter comes with Iridium plugs from the factory. Maybe you got the wrong plugs from your friend...

 

With my stock motor, I'm running the Denso iridium long life plugs and noticed no difference in performance.

Only real benefit of iridiums is the longer electrode life so you can change them less often. It's the reason the TRD supercharger kit comes with Denso iridium plugs - access becomes tighter with the supercharger in place.

 

It's an 03, factory plugs were Denso coppers. That were far beyond the point where they should've been replaced, that'll teach me to believe PO's when they tell you they changed the plugs. The gap on the worst one was .069

 

Iridium is better because it's expensive.

FACT.

 

I drank the Koolaid. I didn't notice a difference. Put in iridium plugs at 45k, I'm at 60 now. 2012 4.0 access cab, hauling a bunch of extra weight and on load E 33s, getting 18.5 average per tank. I'll try copper next time to see what happens.

 

Only real difference I noticed with new plugs is that I got 2 mpg less per tank on the last 2 fill ups. Which is strange considering they're new OEM plugs. Doesn't run any different that I noticed. It was slow before, and shocker, it's slow now.

 

I put NGK Iridiums in my Taco at 50K. 80K later my Taco is still running strong and responsive. Will change them out when they hit 100K. Incidentally, same plug # (

$39 LFR6AIX-11 - 6 PCSNEW

LFR6AIX-11) is called for in my wife's Lexus ES350 and recommended replacement mileage is 120K, but I changed them at 100K. Six Iridium plugs run $40. That's not expensive; it's less than a tank of gas in SoCal.

 

Are those Ngk iridium part numbers the same for both the 2.7 and 4.0 engines?

 

Iridiums are the best of both worlds (Copper and Platinum). The spark is as strong as copper and last as long as platinum. Many boosted applications use them, even (as mentioned above) the trd supercharger. For n/a, you can use factory recommended since the spark isn't as critical. I've had iridiums in my boosted stealth and my R6. They're great for high compression motors. For n/a, they'll work just as well, but it just becomes a choice of how many times you want to change your plugs between service intervals.

The key thing to remember is not to pick the wrong heat range for the plugs. Too cold and your engine won't run very well. Too hot and you'll get lots of pinging.

 

Someone educate me. How does any spark plug increase the power of an engine? Unless some of the old ones were defective and misfiring. Seems to me, that would be like expecting a new light switch to add brightness in the room. I know my original plugs had over 80K on them when I changed them out. No difference at all in the performance with the new plugs. Old plugs still firing every time, new plugs firing every time.

 

i put ngk iridium's in and it runs the same, good. i am happy with them

 

Plugs by themselves will not increase power. They might give you back power from the potential energy loss from older plugs. That being said, only in boosted applications or high compressions engines (think motorcycles) can it make a difference in running a colder plug. A colder plug will resist spark pre-ignition which allows timing advance by tuning.

Again, don't run a colder plug if you are not boosted and not running very high compression.

 

It would be interesting to know if during the ECU reflash, the new tune advances timing.

 

It's not cut-and-dry: Toyota specifies ILFR6C11 as the NGK iridium plug for the 2.7. NGK's application guide says instead to use ILFR6T11 for both 2.7 and 4.0.

Denso's documentation is more consistent: Toyota specifies

$48 SK20HR11 ---- IRIDIUM PLATINUM power pack Spark Plugs -- # 3421 ----- 6 PCS NEW

SK20HR11 as the Denso iridium plug for the 2.7. Denso's application guide says to use SK20HR11 for both 2.7 and 4.0. The plugs that come with the 4.0 TRD blower kit are SK20HR11.

 

Thank you for the info, I'm going to switch to iridiums once it's time only for the longer life of the plug