spark plugs

[phenoyz]

when do we change the spark plugs?
anybody knows the oem spark plug model of yaris sedan '08?
thanks

[Yaris Hilton]

You change them at 100,000 miles.

[highwaypass]

You change them at 100,000 miles.

iridium spark plugs?

[Yaris Hilton]

Yep.

[hatchbackkid82]

the set goes for about $25-$35 depending where you get them from

[xairmech]

Heard that it may be wise to pull plugs @ say 50,000 miles regap & clean the threads add antisieze to threads & reinstall them if you dont want to buy new ones. This is to prevent plugs from siezing in the heads when you pull them @ 100,000 miles.

[Yaris Hilton]

They're installed with proper antiseize compound at the factory, and gapping's not recommended with the iridium plugs. It is highly advisable to let the engine cool completely before removing plugs from an aluminum head, and to use a torque wrench when installing the new ones, though these are plugs that use a gasket and thus have some leeway on installation torque. If you ever strip the plug hole threads in the head, though, you'll wish you hadn't.

[_phenoyz_]

Yep.


do you know the code/name of the spark plug (e.g = bk123456???)
both the sedan and the hatchback have the same spark plugs?
also do they have the same engine as well? (hatch and sedan)

[supmet]

^^the sedan and hatchback have the same engine and spark plugs

Any dealer or parts store will be able to get you the right iridium spark plugs

[Yaris Hilton]

Google "Yaris spark plugs" and you'll quickly find the part numbers. Yes, the engine is the same in the U.S. sedan and liftback models. 1496cc 1NZ-FE.

[N9QGS]

I had no problems pulling plugs at 80,000 from factory. I did mine a little earlier then 100,000 a my own personal insurance, they looked very good. I will probably change mine again at 150,000.

[RedRide]

Heard that it may be wise to pull plugs @ say 50,000 miles regap & clean the threads add antisieze to threads & reinstall them if you dont want to buy new ones. This is to prevent plugs from siezing in the heads when you pull them @ 100,000 miles.

Yes, this his what many recomend.
Personally, I simply changed the iridium plugs on my othe car at about 60k. IMO, if you are going through the trouble of pulling them, you might as well replace them.

[Yaris Hilton]

I'm not going to trouble myself to look at them earlier than recommended, as long as it's running OK.

[SilverGlow]

I had no problems pulling plugs at 80,000 from factory. I did mine a little earlier then 100,000 a my own personal insurance, they looked very good. I will probably change mine again at 150,000.

Insurance against what?

What?

Nothing!

Changing them out before 100,000 miles is a waste of time and money.

[Yaris Hilton]

Yep. If you leave plugs in place way past the recommended change interval till they're totally shot, what will eventually happen is that a Check Engine Light will come on with a code for random misfiring. No BFD.

[Scipher]

I just wanted to come on here and say thanks to you guys for giving me the proper advice to get the job done properly. I'm so impressed I made an account and plan on contributing what little knowledge I have to the cause. This website is awesome.

[fnkngrv]

Yep. If you leave plugs in place way past the recommended change interval till they're totally shot, what will eventually happen is that a Check Engine Light will come on with a code for random misfiring. No BFD.

Or even worse. I can remember when I was in college and working closing shift at Subway. Closed up the restaurant at 0200 and my coworker headed out while I took care of the alarm and cashout. This was back in 1995 when cell phones for all intensive purposes were still bag phones and expensive. I come out to my parent's 86 Corolla with close to 200k miles on it and turn the key...................fires then, POOF! Long story short, original spark plugs and one of them had the porcelain disintegrate. Tried to to call the 'rents on the house phone, but of course they slept through it. I walked the 14 miles home.

sent from my m-o-b-i-l-e

[BobTheYaris]

Change mine every 30,000 on every car I've owned. Don't care what manufacture says


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[IllusionX]

Change mine every 30,000 on every car I've owned. Don't care what manufacture says


Sent from my iPod touch using Tapatalk

at 17.50$ the plug, are you sure?

[fnkngrv]

at 17.50$ the plug, are you sure?


Ouch! Where do you purchase at?

NGK IFR5A11 (http://www.amazon.com/s/ref=nb_sb_noss/184-6009463-7822812?url=search-alias%3Daps&field-keywords=NGK%20IFR5A11)

In my experience NGK plugs are just as good or better than DENSO :iono:

I can go to my local CarQuest and get them for even less than the $8+ on Amazon. The net price on them is around $4 each so even at the $8+ is one hell of a markup!

[IllusionX]

dealer sells them at 17.50$ each.

obviously i didn't go with those. I think i paid 35$ or so for a complete set of denso on ebay.

[fnkngrv]

dealer sells them at 17.50$ each.

obviously i didn't go with those. I think i paid 35$ or so for a complete set of denso on ebay.

Gotcha.

Yeah, I would have to be in a real bind to buy at the stealership with how damned unreasonably expensive they usually are.

sent from my m-o-b-i-l-e

[IllusionX]

I guess it depends on what you buy.

I always get my oil filter from the dealer (at least when i have time to pass by). they are only 6.99$ + taxes

[fnkngrv]

I suppose that maybe I am an exception since my "local" dealership is 60 miles one way away.

sent from my m-o-b-i-l-e

[IllusionX]

everything is far in the US. lol
There are at least 6 toyota dealers around the area within a 20mi radius here. LOL

[jack black]

Hi everyone.
I was changing oil today and decided to check sparkplugs to see how they are wearing at 70,000 miles. The plugs came too easy for so many miles. It turned out the dimwit previous owner replaced 120,000 mile OEM iridium with some aftermarket junk. Bosch Platinum +4. What is this junk?

The plugs looked just like these:
http://i44.tinypic.com/5wn8.jpg

[fnkngrv]

Bosch generally doesn't make junk. As for using non-iridium I haven't used iridium plugs for most of the life of my car without issue.

sent from my m-o-b-i-l-e

[jack black]

Bosch generally doesn't make junk. As for using non-iridium I haven't used iridium plugs for most of the life of my car without issue.

Bosch plugs have a well deserved reputation for this:

http://lh4.ggpht.com/_iCtN9wPdqdY/Sa37ZjOsn9I/AAAAAAAAATU/ej2DgCAcyn0/s640/DSC04053.JPG

or that:

http://i299.photobucket.com/albums/mm285/SDV10/DuuuuuuuuudesBoschPlugGroundBreakoff.jpg

[jack black]

Funny you call these junk! They're the top of the line platinums.

As for the pictures you just posted, my NGK's I had in 3 weeks ago did the same thing than those Bosch plugs.

Well, I called them junk, because I was pretty sure they were not as good as the OEM NGK long life 0.7mm Iridium center/platinum puck ground strap plugs. I'm familiar with that OEM plug as I had the same thing in my RIP corolla with 1ZZ-FE engine.

I knew about frequent problems with defective Bosch plugs, but, not being familiar with this weird 4-ground electrode, I looked it up. Apparently they are notorious for misfires and poor engine performance.

Part of the problem is explained in this study: http://wenku.baidu.com/view/d5c9374c767f5acfa1c7cde7.html

+4 were the worst plug in that study (table 9) due to the massive +4 ground electrode quenching the flame kernel. Notice that the +2 did actually well. More is not better.

Another problem is the cheap tiny 0.4 mm pure platinum electrode. Long life plugs require either 0.7 mm iridium or 1.1 mm platinum electrode (and platinum on ground electrode). 0.4 mm pure platinum has very short life, no more than 20,000-30,000 miles.

Clueless +4 buyers (like the previous owner of my car) are sucked into buying this overpriced, low performance, and low life plug, keep it forever (platinum, baby) and have nothing but problems. I'm swapping them for denso platinum TT plugs this weekend.

[Exiwolfman]

They're installed with proper antiseize compound at the factory, and gapping's not recommended with the iridium plugs. It is highly advisable to let the engine cool completely before removing plugs from an aluminum head, and to use a torque wrench when installing the new ones, though these are plugs that use a gasket and thus have some leeway on installation torque. If you ever strip the plug hole threads in the head, though, you'll wish you hadn't.


i guess u have never worked flat rate...lol that is good idea if u do it urself but honestly not many shops will ...hot or cold they come out lol
Torque is ...snug plus one lol

[Exiwolfman]

Change mine every 30,000 on every car I've owned. Don't care what manufacture says


Sent from my iPod touch using Tapatalk

That is a waist of $$$ and not necessary , old school thinking :rolleyes:

[Pingolfer]

never regap a platinum or iridium plug ( you will render it useless ). Also NGK plugs do NOT need anti-seize, as a matter of fact, NGK say NOT to use it, the chrome threads have an anti-seize built into them. Use anti-seize on Autolite or bare steel threads plugs only

[Pingolfer]

never regap a platinum or iridium plug - it will render them useless. No need to use ant-sieze on NGK plugs, they do not require it, and it is recommended by NGK tht you do not (using it is detrementral). Use never-
sieze only on plain steel threads like Autolite plugs, AC Delco

[jack black]

never regap a platinum or iridium plug ( you will render it useless ). Also NGK plugs do NOT need anti-seize, as a matter of fact, NGK say NOT to use it, the chrome threads have an anti-seize built into them. Use anti-seize on Autolite or bare steel threads plugs only

you resurrected the old thread just to say this?
the real reason not to use anti-seize is because it messes up the torque value. It's OK to use anti-seize AND decrease torque.

[Goosecreekjoey]

What does Toyota know anyway, RIGHT. 100,000. THEY KNOW WHAT THERE TALKING ABOUT.

[Goosecreekjoey]

Could be every 3000 miles like years ago. You Changed plugs when you changed oil. That would be about 30 or so plug replacements in 100,000. G that would be great. Toyota knows, like the SHADOW KNOWS. WHOES the SHADOW, look up.

[blktiger60]

At almost 92k on my `08. Planed on changing the plugs this summer.
How are the factory wires on the yaris? Will they have deteriorated to any consequential degree in 10 years?

[blktiger60]

108,400 now, just bought new plus for the first time. Will be changing them out soon.

[ex-x-fire]

Get some coil boots too.

[komichal]

Get some coil boots too.

Why is that? I have changed spark plugs several times, I have never noticed any damage or worn-out boot.

[ex-x-fire]

Why not, its just a few bucks more.

[komichal]

I also like preventive maintenance, however I never thought of changing the boots as I have never seen anyone having problems with these. Luckily for me, they are not normally sold in the stores around so I am not tempted to buy them. :) Plus I believe the original ones, though 13 years old, are still better than new aftermarket ones.

[robkay]

My '07 hatch has been running fine, but I knew it was overdue for a plug change at just under 137000. I bought the stock Denso plugs. It make a big difference in how the car runs.

[Mister]

90 000 Kilometers is what is stated in the TIC documents from what I see. Iridiums.

[mr9865]

I'm at 160,000 on the original plugs, maybe i should change them?

[Compeer]

I'm at 160,000 on the original plugs, maybe i should change them?

Iridium plugs don't melt the tips like copper plugs do, You can clean them check the gap and if they look mint they are mint.

We changed out copper plugs at 30k because they slowly burnt the copper tips away, iridiums melting tempture is so far above the engines combustion tempture you could melt the entire engine down and the irdium tips would still be intact.\

So at 100k you can clean them, regap them and if they dont look damaged reinstall them, Ive heard of people doing 300k km on them and they are mont as long as they are cleaned and gap checked every service.

In saying that I run one step colder plugs NGK bkr6eix-11 since I live in the heat and like to give her shit, she runs mint on them.

NGK and Denso are both japanese made quality plugs that provide OEM plugs to japanese companies, if Denso is out of a plug they install NGK and vice versa in japanese cars.

[sh0rtlife]

I'm at 160,000 on the original plugs, maybe i should change them?

100-150k is useualy when the OEs start failing in most cars...asuming we are talking miles not kilometers lol

[mr9865]

160,000 miles