Do any of you Techs out there know of any of these so called performence spark plugs that actually improve the 470's MPG and HP and not effect the warranty?

 

Snake oil for the most part I would stick with OEM on this one, the only after market I might consider is the Bosch IR Fusion

 

New spark plugs usually make it feel like a new engine was installed. I normally install iridium plugs so I don't have to do it again. The cost is higher, until you figure labor and installing them less often.

 

Iridium is OEM on the 2004's, I changed mine at 90,000

 

I vote for that, nothing beats the OEM.

 

What about for 2008 is the OEM Iridium too?
Thanks
-rbx10

 

Must be, iridium is the new standard for plugs, go to an auto zone or pep boy search

 

Yes

 

And it is an easy DIY project, plenty of room to work, takes about 45 mins to do all 8.

 

What is the recommended miles on changing the plugs on a 2004? I have 77k.

 

I forget , check you schedule in your manual, usually 100,000 or 120,000, don't remember, whatever it is, it is too long, did mine at 90k, truck ran like new, MPG went up to constant 17.9 on the inboard computer.

 

I run Autolite Iridium XP in my 4Runner and I like them.

The tone of the engine changed slightly, and I think the engine runs better. And, according to the most scientific method widely known as "by-the-seat-of-my-pants", the truck accelerates better.

I plan on installing them in my GX when I get to that.

 

Any new plug makes the truck run better after 75,000+ miles, the advantage to iridium is it's longevity

 

i wonderin what brand of plug wires to run and mine has 225000 on it and i just got it and dont know when they were changed last. but i changed the valve cover gaskets and i think they were the factor ones and i had a mager oil leak. i pulled the plugs and they were covered in oil