Iridium plugs?

[ultimatt]

Has anyone used them?

Rock Auto has the Denso (4701) IK16TT for $5.50 each, but each plugs comes with a $2.00 rebate. So, total cost for 6 plugs would be $21.

Before people go crazy, I KNOW the OE plugs were twin electrode and that the iridium is a single electrode plug. However, my understanding was that back when the 3rd gens came out they needed the twin electrode due to the waste spark system they used and its effect of essentially double firing the plugs. This meant a standard plug would wear 2x as fast as normal.

Since the iridiums are the longest lasting plugs available my thought is that they would be no problem in the 3.4l.

Thoughts?

Thanks.

 

[WallyWest]

You'll find people who are downright religious about the dual electrode thing, but from what I've read Iridium works perfectly fine in the 3rd gen 4Runner. I put dual electrode, double platinum plugs in mine, mostly because of price. I know there are people running Iridium plugs.

For that price I'd go for it. Just cut the expected lifetime in half because of the waste spark ignition system.

 

[gamefreakgc]

Iridium plugs are must for those of us with superchargers because we need colder plugs.

For the normal engine, they will just last longer. To be honest though, there's some members on here that have seen 100k+ on the copper dual ground plugs. Plus they are cheaper.

 

[AZBub]

Has anyone used them?



Rock Auto has the Denso (4701) IK16TT for $5.50 each, but each plugs comes with a $2.00 rebate. So, total cost for 6 plugs would be $21.



Before people go crazy, I KNOW the OE plugs were twin electrode and that the iridium is a single electrode plug. However, my understanding was that back when the 3rd gens came out they needed the twin electrode due to the waste spark system they used and its effect of essentially double firing the plugs. This meant a standard plug would wear 2x as fast as normal.



Since the iridiums are the longest lasting plugs available my thought is that they would be no problem in the 3.4l.



Thoughts?



Thanks.

Brave for even posting it but you are right. Don't get talked out of buying them.

 

[LittleCaesar]

Having used both types in mine in the last decade don't over think it and get the dual electrode plugs. Your engine will thank you for it unless you have a SC, then by all means.

 

[AntleredRuin]

If price is why you're trying this, then just go with the OE Denso/NGK from AutoZone. They'll cost the same, give or take a few pennies, and the engine was designed to use them.
Iridium plugs WILL last longer than cheaper plugs, but their life will still be cut in half due to the waste spark system.
All this assuming you aren't supercharged, as mentioned above.

 

[cleanrunner]

I used the denso iridium power on my 3rzfe (2.7) and switched back to the ngk copper. The trade off wasn't worth it for a relatively stock motor.

 

[freshley]

I just took a set of NGK iridium plugs out of mine with only 30k miles on them and the electrodes on the one side were almost worn down to the insulator while the other 3 looked like new. I saw no increase in HP or MPG with these being used and over all not worth the extra. Stick with the dual electrode and if you want them to last longer go with the platinum ones. I've had a set of platinum ones go for 100k miles without any problems.
On these trucks, keep it simple.