ctecperformance
Devoted member
- Nov 1, 2023
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The UK OEM plug is NGK DILKAR8U7G heat range 8. If you want to run one heat range cooler you need to go heat range 9. The higher the HR number, the cooler the plug heat range
GR Yaris Plugs
- Thread starter Michael Knight
- Start date
No problems there then, I just looked back at the photo and I thought it would have been more but I guess that’s why we use a tool. Platinum plugs seem to last forever.
- Dec 27, 2021
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Kiitos! Searching elsewhere was fruitless so three plugs are currently winging their way to me from Finland. Crazy that these parts seem so hard to find.Ordered from local dealer here 60€ for 3 plugs + delivery.
NGK - LKAR8BHX - NGK Ngk Spark Plug Stock # 91784 | Spark Plugs | Laukkanen Motorsport English
Buy NGK - LKAR8BHX - NGK Ngk Spark Plug Stock # 91784 quickly at a low price in Laukkanen Motorsport. Click and order now or visit our shop. Spark Plug - Ruthenium HX - 12 mm Thread - 26.5 mm Reach - Gasket Seat - Stock Number 91784 - Resistor - Each Additional information...laukkanenmotorsport.fi
Really hoping these make a difference. Starting and pickup on tip-in is really bad now.
Just an update on my order, no UK stock so coming from US. Supplier said possibly by early this week but as of yet nothing
Sorry for not the greatest photo I’m at 33,000 miles and have had a misfire that’s intermittent and if leaving the car for a while it’s cold start needed some revs. I’d also say mpg has been down slightly so it’s plugs or coil pack I expect. By the time I drop at the dealer leave it and then pick it up I’m cheaper buying plugs and coil although need access to a proper reader (Hampshire) to see what coil is misfiring.
However just swapped over had an initial stuttering and then after 30 seconds nothing. Only done a small journey so far but feeling good it might be the solution.
However just swapped over had an initial stuttering and then after 30 seconds nothing. Only done a small journey so far but feeling good it might be the solution.
I left it at default which was 0.8mm. Just done a 30min trip with no issues to report but like others have mentioned it does feel better.
- Dec 6, 2021
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Swapped my plugs this weekend after reading this thread, and can only echo the same results, with the originals having done 26k miles. Car immediately sounded smoother on tickover, much happier pulling away and around town, feels less likely to drop the revs and stall. Feels smoother all along the rev range, a bit like having lovely cold boost weather. Who needs a remap??
Also managed to have a near total disaster after getting distracted and attempting to put the third spark plug in before I'd removed the old one
This broke the insulating part on the old plug leaving pieces of it deep in the hole. Had to mate a piece of garden hose to the vacuum cleaner to fit down in the hole and get all the bits out in case they went into the cylinder when I removed the plug. Total idiot moment, but disaster averted. I'm used to working on Mini engines where the plugs all stick out the front 
Also managed to have a near total disaster after getting distracted and attempting to put the third spark plug in before I'd removed the old one
This broke the insulating part on the old plug leaving pieces of it deep in the hole. Had to mate a piece of garden hose to the vacuum cleaner to fit down in the hole and get all the bits out in case they went into the cylinder when I removed the plug. Total idiot moment, but disaster averted. I'm used to working on Mini engines where the plugs all stick out the front 
And just to update I’ve done some longer journeys now and can confirm the misfire I was experiencing has gone.
Recommend to those coming up to 30k miles worth swapping instead of waiting to 60k considering the cheap price.
Recommend to those coming up to 30k miles worth swapping instead of waiting to 60k considering the cheap price.
- Dec 27, 2021
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For those considering changing, it’s worth just checking the gaps on your current plugs as I found mine were too narrow from the factory.
Re-gapping them cured the hesitation and slow starting I had been experiencing.
Re-gapping them cured the hesitation and slow starting I had been experiencing.
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Sekred
Totally Hooked
- Dec 18, 2021
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Their just an alternative to Iridium.
ngksparkplugs.com
Ruthenium HX™ Spark Plugs - NGK Spark Plugs
Ruthenium HX High Ignitability spark plugs for NGK are designed for maximum durability and performance in today’s highly efficient engines.
ngksparkplugs.com
With the talk of plugs, although I've only just passed 10,000 miles /3yrs old, for the sake of 5mins, I whipped one of mine out to check. Here's what I found. I'm inclined to change them for the modest cost of new plugs. And then the next change will be in another c.10,000 miles at the 6yr standard service interval.
Any thoughts to the contrary i.e. am I wasting my time and cash given the current condition of plugs?
Tia
Any thoughts to the contrary i.e. am I wasting my time and cash given the current condition of plugs?
Tia
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- Dec 27, 2021
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Plugs degrade with use, not time, so at 10k I’d say it was debatable whether there’s any benefit at all in changing them.
Having said that, it won’t hurt and they aren’t super expensive (3-cylinders ftw!) so I guess it’s up to you
Having said that, it won’t hurt and they aren’t super expensive (3-cylinders ftw!) so I guess it’s up to you
In addition there has been coil issues so it can also become an issue if your plugs are worn. .Plugs degrade with use, not time, so at 10k I’d say it was debatable whether there’s any benefit at all in changing them.
Having said that, it won’t hurt and they aren’t super expensive (3-cylinders ftw!) so I guess it’s up to you
Off the back of this thread it seemed like a no brainer to me to change my plugs as only £60. My GRY is 3yrs old and has done a touch over 11k miles, mostly B road blasts on a weekend. I haven't had chance to get out for a drive yet but looking at the plugs it won't have done any harm. With a 14mm deep wall socket and taking my time with torque settings for plugs and coil pack bolts, it took me about 45mins.
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