denso platinum TT sparkplug life?

[friendly_jacek]

I'm a big fan of denso iridium TT "super sparkplugs" (120,000 miles+, 0.4mm iridium wire and platinum tip on ground, high performance, fuel saving).

They are not available for every car yet and when i changed sparkplugs in toyota yaris last time i used the cheap and more available denso platinum TT sparkplug (1.1mm platinum wire and titanium tip on ground). I can't find anything on their expected lifespan. Should i check them at 30,000 miles? Anyone using them? Someone wrote review on AAP that the ground electrode eroded at 14,000 miles, but you can't believe what people put in those reviews.

 

[Hokiefyd]

I would think that a quality plug should be good for at least 75k miles, especially if protected by harder metals on both sides of the spark, as these appear to be.

 

[Vikas]

At one time, platinum were more expensive plugs than iridium (at least on the NGK line for my Honda V6 engine) Both last over 100K miles

 

[Audios]

75k or so is probably where Id start to recheck them for wear

 

[Linctex]

If they are easy to access, It might be worth it to take a peek at them around the 60,000-70,000 mile mark.

 

[JMJNet]

Depends on the car brand, model, type, year? and the conditions of the car in terms of maintenance.

 

[zzyzzx]

I don't know what type of Denso plugs are in the GF's 2000 Camry, but I replaced them at 125K, and they were still quite usable, as in, if you compared it to a new one, you could see a difference, but if I had pulled one before buying the new ones, I would have just left them in for another 25K miles.

 

[KrisZ]

Checking or changing spark plugs on Toyota Yaris is very easy, however these plugs, as mentioned already, should be good for at least 75k miles. But if it bothers you, I would check them out.

 

[ARCOgraphite]

Don't need to go nuts for TT on engines with COP iggy! Just finewire Ir. IMO, The TT are for lost spark ignition that Fire GND to Centre.

 

[Kool1]

I have the Denso Iridium TT Spark Plug: IK20TT in my 2003 Honda CRV. I bought them when they were relatively new to the market which was about 2 years ago. I've put on about 30,000 miles and have absolutely no problems with the spark plugs. The most notable difference that I've noticed is that my idle is now rock solid. I had very slight vibrations at idle with my old spark plugs which were NGK iridiums but the Denso Iridium TT spark plugs cured the problem immediately. Driveability and gas mileage are the same as with the NGK iridiums.

 

[nthach]

Denso developed the TT plugs originally for the Lexus version of the Toyota GR/UR engine family to help cope with DI. I installed the Platinum TTs on a Subaru that a friend formerly owned and I have faith they will go 60K. Titanium is a durable metal, they use it in jet engines - however Ti blades in the turbines of a jet are also microcooled.

 

[Jimzz]

They are good plugs but are a single Platinum plug. Single Plat is usually rated for 60k. If you pull them every 30k and check the gap you can probably get 90-100k out of them.

I have a set in my truck but its easy to get to the plugs in my truck. For a car that I have to pull the plenum/intake system I run double Plat or Iridium.

 

[y_p_w]

Originally Posted By: nthach
Denso developed the TT plugs originally for the Lexus version of the Toyota GR/UR engine family to help cope with DI. I installed the Platinum TTs on a Subaru that a friend formerly owned and I have faith they will go 60K. Titanium is a durable metal, they use it in jet engines - however Ti blades in the turbines of a jet are also microcooled.


Titanium itself is relatively soft, and its durability depends on the particular alloy. I remember a lecture on jet engine metals in a materials science class, and the prof talked a lot about superalloys that might contain titanium, aluminum, etc. Jet engine blades are mostly nickel. That prof did seem to love talking about the frozen chicken test with jet engines. Something about testing how they fail by sucking in a frozen chicken.

Denso (and NGK) always seemed to use the most platinum in their plugs. I know the thin wire theoretically resists erosion, but Bosch plugs seem to be notorious for eroding away. ND and NGK have a more robust design.

 

[y_p_w]

Originally Posted By: Jimzz
They are good plugs but are a single Platinum plug. Single Plat is usually rated for 60k. If you pull them every 30k and check the gap you can probably get 90-100k out of them.

I have a set in my truck but its easy to get to the plugs in my truck. For a car that I have to pull the plenum/intake system I run double Plat or Iridium.

I think it's a good idea to check them just to reduce the chance of them seizing to the threads. Most plug makers don't recommend using anti-seize on any of the nickel-plated threads.

It's kind of ironic, since a lot of the reason for going to exotic plug materials with longer life is that it's a pain to access some plugs. It's typically V engines or boxers.

 

[Vuflanovsky]

Originally Posted By: JMJNet
Depends on the car brand, model, type, year? and the conditions of the car in terms of maintenance.


I would tend to agree with that....Irridium plugs from Denso and NGK that I've used in different cars since 2003 tend to last 100K miles as advertised but that's not to say that you won't notice a significant degradation of performance between 60-75K miles depending on the vehicle. With single Platinum plugs I would check them before 50K miles but you might not have to depending on the car.

 

[friendly_jacek]

Originally Posted By: nthach
Denso developed the TT plugs originally for the Lexus version of the Toyota GR/UR engine family to help cope with DI.


good info. first time i saw the super spark plug (the real deal, iridium/platinum) was my 2006 V6 Rav4. they last forever. now, you can buy them for almost any car, there is even one for yaris, too.

 

[friendly_jacek]

I see consensus is about 60,000 miles. I'll check at 30,000, but wont order any replacements yet. BTW, the car had only 60,000 miles when i had to replace the spark plugs, because the previous (idiot) owner, threw away perfectly good long life (iridium/platinum) OEM spark plugs (good for 120,000 miles) and put in bosch +4 "platinum" garbage/gimmick. The engine idled better right after i put regular plugs in.

 

[The_German]

I pulled the Denso iridiums from my Fit at 80,000km.

They looked new.

I replaced with NGK 6774 because the Fit is a PITA to do plugs on.

Changing all 4 coil packs this Spring too got them dirt cheap Hitachi OEM. They have 90,000 kms on them but I have had misfires that are most likely related to needing a valve lash adjustment but wanted to try and bring back my fuel economy as I intend on keeping the car for 12 years unless I am tempted into a CRV earlier.

 

[CELICA_XX]

Originally Posted By: friendly_jacek
They are not available for every car yet and when i changed sparkplugs in toyota yaris last time i used the cheap...


Denso Part #: IK16TT
or
4701 (duplicate part number)


Should be what you're looking for.

I have the same engine as you, but I chose the regular Iridium Long Life plugs (rated for 100,000 miles)

 

[y_p_w]

I was talking to a Denso rep on the phone years ago when I was having issues getting a certain set of platinum plugs. My GS-R specified a 1.3 mm gap, but all I could order retail was a 1.1 mm gap. The rep told me he'd ship out a set (and I could drop my current plugs at a dealer) but it never arrived. I did get a Denso trucker cap though. During the call he was telling me that they tested their OEM-style platinum plugs, and they could really last forever in some cases. He said they were functioning just fine indefinitely in their tests, but that they recommended checking them periodically for erosion or damage.

Later I brought my car in to a shop for servicing, and I ended up getting the plugs and labor for free when I didn't ask for them. However, they could only get the 1.1 mm gap and retapped them. The box clearly said they shouldn't be regapped. I think they worry that the platinum might be damaged.