Spark plugs - Scion iM Forum
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post #1 of 16 Old 07-21-2019, 03:49 PM Thread Starter
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Spark plugs

has anyone replace spark plugs yet? Our old spark plugs (SC20HR11) has been superseded by new spark plugs (SC16HR11). Just wondering if anyone noticed any difference.
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post #2 of 16 Old 07-22-2019, 03:44 PM
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has anyone replace spark plugs yet? Our old spark plugs (SC20HR11) has been superseded by new spark plugs (SC16HR11). Just wondering if anyone noticed any difference.
Not yet. 52000 miles and just checked a few weeks ago.
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post #3 of 16 Old 07-22-2019, 04:43 PM Thread Starter
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Not yet. 52000 miles and just checked a few weeks ago.
Thanks for the response... I am around 80,000 miles... I think the owners manual says 100K miles right?
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post #4 of 16 Old 07-25-2019, 06:40 PM
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I'm at 85 on my 2016. I've pulled the plugs on mine around 75k when I was doing compression tests with my labscope and checked them out. Honestly I would move up the interval a little to maybe 75 to 90. Theres a lot of carbon blow by past the porcelain which is a good indicator for plug wear. I'll be doing mine at 90 just because. I don't see an issue with waiting to 100 since my experience is anecdotal
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post #5 of 16 Old 02-03-2020, 03:43 PM
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I have replaced the plugs cuz I do auto x and want to car to stay in tip top shape. Honestly I'd just go with the Autolite XPs. Short gap and improved response and idle.
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post #6 of 16 Old 06-11-2020, 10:59 PM Thread Starter
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I was curious and skeptic about Toyota superseding the old plugs (SC20HR11) we had on our iMs. Now I know why....

I just changed my spark plugs with 90919-01275 (SC16HR11). The car is around 95K miles. I should have replaced it a long time ago. No more RPM fluctuations, no more vibrations at high rpms (which I thought was normal).

I have a 6 speed manual and you cant even tell the car is under load. Accelerating on the freeway on ramp is a breeze....

Engine is more smooth and quiet. I can actually hear my exhaust now lol.

Its only been 500 miles so far. I will post another feedback later.
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post #7 of 16 Old 06-12-2020, 09:29 AM
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Originally Posted by B91SUPRA View Post
I was curious and skeptic about Toyota superseding the old plugs (SC20HR11) we had on our iMs. Now I know why....

I just changed my spark plugs with 90919-01275 (SC16HR11). The car is around 95K miles. I should have replaced it a long time ago. No more RPM fluctuations, no more vibrations at high rpms (which I thought was normal).

I have a 6 speed manual and you cant even tell the car is under load. Accelerating on the freeway on ramp is a breeze....

Engine is more smooth and quiet. I can actually hear my exhaust now lol.

Its only been 500 miles so far. I will post another feedback later.
Interesting.
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post #8 of 16 Old 06-12-2020, 09:54 PM
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Quote:
Originally Posted by B91SUPRA View Post
I was curious and skeptic about Toyota superseding the old plugs (SC20HR11) we had on our iMs. Now I know why....

I just changed my spark plugs with 90919-01275 (SC16HR11). The car is around 95K miles. I should have replaced it a long time ago. No more RPM fluctuations, no more vibrations at high rpms (which I thought was normal).

I have a 6 speed manual and you cant even tell the car is under load. Accelerating on the freeway on ramp is a breeze....

Engine is more smooth and quiet. I can actually hear my exhaust now lol.

Its only been 500 miles so far. I will post another feedback later.
The SC16HR11 plugs are one step hotter. I've not noticed any issues with my 2107 iM but I only have 11k miles on it currently. I did install a set of the hotter SC16HR11 in my wife's 2010 Prius when I did the 120k mile service. I've continued to use the colder SC20HR11 in my 2009 Corolla S Turbo 5MT. The colder plugs work better with the turbo but they get gapped much smaller at .028-.032. You can find the OEM Denso SC20HR11 plugs on eBay for a good price. I bought 4 sets of them for $12 a set of 4 plugs! Great find!!!

89 Supercharged White MR2 5MT/09 Corolla S TURBO CSM 5MT
17 Corolla iM CSM 6MT/ 17 RAV4 XLE MGM
95 Previa S/C White AT/06 Scion xB MT/10 Prius III Blizzard Pearl

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post #9 of 16 Old 06-14-2020, 12:46 PM Thread Starter
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That's good you found ones for cheap... Also, just be aware that there is a lot of fake denso's out there. I heard horror stories of guys bought denso plugs not knowing they are fake.

I found a link that could help guide on avoiding fake plugs:

https://www.driven2automotive.com/bl...rk-plugs-2017/

I believe SC20HR11's have been disontinued (not sure if only in the US).....
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post #10 of 16 Old 06-15-2020, 01:01 AM
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That's good you found ones for cheap... Also, just be aware that there is a lot of fake denso's out there. I heard horror stories of guys bought denso plugs not knowing they are fake.

I found a link that could help guide on avoiding fake plugs:

https://www.driven2automotive.com/bl...rk-plugs-2017/

I believe SC20HR11's have been disontinued (not sure if only in the US).....
That doesn't help me very much. The ones I bought are the Toyota replacements in Toyota boxes. I wish there was a telltale sign of how to spot a real one vs a fake Toyota Denso plug.

89 Supercharged White MR2 5MT/09 Corolla S TURBO CSM 5MT
17 Corolla iM CSM 6MT/ 17 RAV4 XLE MGM
95 Previa S/C White AT/06 Scion xB MT/10 Prius III Blizzard Pearl

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