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Old 12-18-2008, 12:33 PM   #1
33lam
 
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spark plug

I am looking for new spark plug for my car....but i am struggling of which model should i get...coz they have NGK Iritop 8, 7, etc etc...i know 8 is for Nissan....so wt about Yaris???
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Old 12-18-2008, 01:37 PM   #2
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don't they come with denso iridiums? mine did
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Old 12-18-2008, 01:40 PM   #3
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mine had ngk iridiums, i have hks ("beefed" up denso plugs) in there now though
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Old 12-18-2008, 02:38 PM   #4
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Called the dealership and Nippon Denso Plugs are $21 a piece. Seems a little pricey to me. A guy on here put those pulse plugs on his and burned something up due to excessive heat.

What does the car call for because there is a hundred different plugs for this thing??
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Old 12-18-2008, 02:45 PM   #5
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Prob w/e Toyota recommends.
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Old 12-18-2008, 02:47 PM   #6
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the pulstar plugs foul the coil pack because they draw excessive power through the coil. if you had okada coils you would be ok.
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Old 12-18-2008, 03:05 PM   #7
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I'm using NGK BKR7EIX Iridium Spark Plugs. These are heat range 7 which is what is recommended for forced induction engines. If I read the literature correctly, they draw more heat from the combustion chamber and lessen the tendency to have pre-ignition (knocking).

They were not very expensive.
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Old 12-19-2008, 12:01 AM   #8
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just go to autozone or whatever for the plugs... and give them the actual part number.. itll be closer to 10$ if not less per plug, plus iridiums are good for something silly like 60k or 100k i can't remember
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Old 12-19-2008, 01:43 AM   #9
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Ya the OEM numbers they call for are:

DENSO SK16R11

NGK IFR5A11
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Old 12-19-2008, 08:12 AM   #10
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Here's a question: How long should I go before I replace the original plugs??
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Old 12-19-2008, 12:03 PM   #11
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Check them at 15k miles, but you should be good. Really check them at 30k. They may need to be replaced at 30k, but I doubt it. Just check every 30k miles after the first 30k. I always recommend checking at 15k cause you never know how a new motor will react. IE piston ring's not seating right away. If that happens they allow oil into the combustion chamber fouling the plugs. Now this is very very unlikely but you can never be to cautious. Also if you notice hard starting, or hesitation while trying to pass someone on the highway have your plugs check out this may indicate a problem with them.

Hope that helped. Also if your worried about your warranty just take your car to the shop for it's regular service and they check them when it's time.
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Old 12-19-2008, 12:14 PM   #12
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The OE plugs are really GREAT plugs, and under "normal" driving they should last 100k miles. (so they say... at least 50k)

But, my experience with them after a fair amount of track use (lots of time at or near the redline, almost constant full-throttle acceleration for 20-40 minutes at a time) was that one of them started giving high-rpm misfires at about 18,000 miles.

If you're just using the car for commuting and general driving, don't waste your time and money on spark plugs until/unless the computer throws a CEL for misfires. You're just throwing money away. And then, if you get 50k or more out of the OE plugs, the were obviously a good choice... replace with the same!

If you do any sort of competition on a regular basis, you're better off switching to a standard (not iridium, not platinum, not unobtanium) NGK plug and just changing them every 10-20k. There is SO little performance to be gained by using uber-expensive plugs, it's just not worth it.
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Old 12-19-2008, 12:29 PM   #13
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Quote:
Originally Posted by Loren View Post
The OE plugs are really GREAT plugs, and under "normal" driving they should last 100k miles. (so they say... at least 50k)

If you do any sort of competition on a regular basis, you're better off switching to a standard (not iridium, not platinum, not unobtanium) NGK plug and just changing them every 10-20k. There is SO little performance to be gained by using uber-expensive plugs, it's just not worth it.
Totally and 100% agree with this statement.
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Old 12-19-2008, 12:29 PM   #14
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From the service manual:
Attached Images
File Type: jpg plugs.JPG (26.8 KB, 231 views)
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Old 12-19-2008, 11:18 PM   #15
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When Loren says something.....I listen.

Thanks Loren.
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Old 12-20-2008, 04:30 AM   #16
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Ya the manual says to only replace them with iridium tip. I want to know why in the world some plugs say pre gapped and not to gap them then some people say always to check the gap. My car has about 67,000 miles on the stock plugs and it still fires up fine. I need to check mine but I am afraid I will mess something up when I take them out to look at them.

Does anyone know any place that carries Denso like Autozone, Napa, Advanced Auto or any auto parts stores like those? Online it said they didnt carry them.
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Old 12-20-2008, 04:56 AM   #17
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I know this sounds retarded but has anyone done a DIY for changing the plugs?
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Old 12-20-2008, 08:56 AM   #18
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Quote:
Originally Posted by slvryaris View Post
Does anyone know any place that carries Denso like Autozone, Napa, Advanced Auto or any auto parts stores like those? Online it said they didnt carry them.
I ordered mine from www.sparkplugs.com

If not for the snow, they would have been here yesterday. I've got a little over 70,000 miles and my mpg has dropped a bit lately so I figured it couldn't hurt to change them.

It looks like a simple job in the service manual. I'll try to remember to take a couple of photos.
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