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11-27-2022, 02:01 PM | #1 |
Drives: 2007 toyota Yaris Join Date: Jan 2011
Location: Spartanburg sc
Posts: 15
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Spark plug choices
I have 235k miles (2007 hatchback) on original plugs and still runs perfect but want to change them. The guy at auto zone said the cheap 3 dollar plugs won't do the job and iridium plugs are a must. If that is true, then I will buy the 10 dollar iridium's. Not sure if that was a sales pitch or if iridiums are really necessary. Thanks
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11-27-2022, 08:06 PM | #2 |
Drives: 2009 Base Hatch 2 Dr Auto Join Date: Dec 2008
Location: nj
Posts: 4,790
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Not necessary at all in my experience. We have a tech day for Honda ST 1300 motorcycles and we change a lot of plugs. One guy with 35,000 miles on his iridium equipped ST found a damaged iridium plug. Not sure how it got damaged. Another guy from Columbia with 75,000 miles on his bike have the original conventional plugs. We went to honda to get new ones but they didn’t have any. So we just carefully gapped and reinstall the old ones. Machine ran like a watch.
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11-27-2022, 09:09 PM | #3 |
Drives: 2014 Yaris SE Join Date: Apr 2014
Location: NYC
Posts: 1,076
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The Yaris is spec'd for iridium plugs. DENSO SK16R11 or NGK IFR5A11, as per the manual.
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11-28-2022, 04:33 PM | #4 |
Drives: 2007 5dr canadian import Join Date: Dec 2016
Location: pacific north WET
Posts: 1,025
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personaly ive found a few things with plugs...
NGK on euro/jap/bike champion on small engine/american older stuff and BIKES autolites are hit n miss at best..cheep plug you toss in something your selling bosche seem to only work well in volvo/MB/bmw and some audis..but not most vw's as far as the iridums go...they work well on modern engines not so much on "old" stuff...that said i noticed an improvement when i changed the yaris plugs at 100k but ive only ever found issues with BRAND vs make/model not so much what "type" of plug it is |
11-28-2022, 05:19 PM | #5 |
Gen 3 > Gen 2
Drives: NCP131, F-150 Join Date: Jul 2019
Location: Red Deer, AB
Posts: 499
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Denso or NGK only. I change mine every 60,000 miles or so.
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2014 NCP131 5 Speed 2007 F150 4.2L 5 Speed 2013 Rav4 LE AWD Autotragic - Wife's |
11-28-2022, 08:03 PM | #6 |
Drives: 2009 Base Hatch 2 Dr Auto Join Date: Dec 2008
Location: nj
Posts: 4,790
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I would definitely NOT Be spending $40 plus on a car with 235,000 miles on it. Go with the three dollar plugs for $12! YEAH !
Then leave them in there for 100,000 miles. I change the plugs on my wife’s Camry at 150,000 miles it didn’t make any difference at all cost $40 The plugs I took out were excellent condition. I couldn’t bear to throw them out. The only thing I recommend about changing spark plugs is take them out every 30,000 miles or so and clean the threads. On my wife’s Camry I left them in for 150,000 miles and when I try to take them out they were stuck. To get them out I had to start the engine and remove them with the engine hot. Than it was easy
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Synthetic Oil: Its All In Your Head Last edited by bronsin; 11-30-2022 at 08:34 AM. |
11-30-2022, 06:09 AM | #7 |
Drives: 2007 toyota Yaris Join Date: Jan 2011
Location: Spartanburg sc
Posts: 15
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Thanks for the input. I think I will go with the 12 dollar set.
Anyone know what the gap should be on those? |
11-30-2022, 08:05 AM | #8 |
Drives: 2009 Base Hatch 2 Dr Auto Join Date: Dec 2008
Location: nj
Posts: 4,790
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These will only sent you back eight dollars
Actually the the autolights Are only $1.10 apiece! Gap is ..44 https://www.rockauto.com/en/catalog/...park+plug,7212
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Synthetic Oil: Its All In Your Head Last edited by bronsin; 11-30-2022 at 08:36 AM. |
11-30-2022, 10:46 AM | #9 |
Drives: 2007 toyota Yaris Join Date: Jan 2011
Location: Spartanburg sc
Posts: 15
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Thanks Bronsin, I appreciate the info.
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12-02-2022, 05:55 PM | #10 |
Drives: 2007 Toyota Yaris 3 door Join Date: Sep 2018
Location: Arizona
Posts: 405
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yikes, im worried about all the bad advise going around, the 1nzfe is made for iridium plugs, nothing else, period!
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12-02-2022, 08:16 PM | #11 |
Drives: 06 Polar White 5dr, 13 Soul 4u Join Date: Oct 2008
Location: Georgetown, Ontario, Canada
Posts: 5,743
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Why exactly do you say that? I ran old school Champion plugs for a couple years. Honestly didn't notice a lick of performance or fuel economy differences compared to the iridium.
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12-12-2022, 04:50 PM | #12 |
Drives: 2007 Toyota Yaris 3 door Join Date: Sep 2018
Location: Arizona
Posts: 405
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because you run the risk of increasing carbon in combustion chamber, worse fuel economy, power, the 1nzfe was tuned and calibrated to run iridium spark plugs that can take high heat from fairly lean afrs like the 1nzfe, you could be ok with your champion plugs now, but in reality you technically are not maximizing the life of your engine
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12-12-2022, 04:52 PM | #13 |
Drives: 2007 Toyota Yaris 3 door Join Date: Sep 2018
Location: Arizona
Posts: 405
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oh yeah and not to mention that iridium is more conductive than copper so it takes less voltage to spike and fire the spark, so you are also prematurely wearing out the ignition coils
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12-13-2022, 08:13 AM | #14 |
Drives: 2009 Base Hatch 2 Dr Auto Join Date: Dec 2008
Location: nj
Posts: 4,790
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An interesting theory. Can you quote a source on that?
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12-13-2022, 02:17 PM | #15 |
Drives: 2007 4dr sedan Join Date: Jun 2009
Location: Montreal
Posts: 94
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12-13-2022, 07:01 PM | #16 | |
Drives: 2009 Base Hatch 2 Dr Auto Join Date: Dec 2008
Location: nj
Posts: 4,790
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Quote:
But I’m pretty sure you can’t gap Iridium plugs without damaging them. That is if you find the gap on your iridium plugs much greater than .44 bending the plug will damage it.
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Synthetic Oil: Its All In Your Head |
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12-13-2022, 08:06 PM | #17 |
Drives: 2009 Base Hatch 2 Dr Auto Join Date: Dec 2008
Location: nj
Posts: 4,790
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dear thetut
That was an interesting piece. But it didn’t explain why copper core plugs will wear out your coils. I also didn’t get from it why copper core plugs would cause premature engine wear
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Synthetic Oil: Its All In Your Head |
12-14-2022, 12:43 PM | #18 |
Drives: 2007 4dr sedan Join Date: Jun 2009
Location: Montreal
Posts: 94
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More research required but I'm too lazy.
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