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@PGA71 - It looks like the original spark plugs were Denso P/N FK20HBR11. What Denso P/N did you replace them with? The new spark plug in your picture is Denso FK20HBR8, instead of FK20HBR11.
These were supplied by Bell Lexus North Scottsdale based on my VIN.
The BL part number was 90919-01263 that I am reading off the receipt.
(yes, I keep meticulous records)
Not sure what the difference is but like I said, Gas mileage and performance was like day 1 before and after change.
These were supplied by Bell Lexus North Scottsdale based on my VIN.
The BL part number was 90919-01263 that I am reading off the receipt.
(yes, I keep meticulous records)
Not sure what the difference is but like I said, Gas mileage and performance was like day 1 before and after change.
Thanks
@PGA71 - Your gas mileage and performance may have been the same after you changed the spark plugs but there is a huge difference in the gap spacing of the OE spark plugs you pulled out and the new spark plugs you installed. Someone is driving your old 2013 GS 350 with the wrong spark plugs, though they are almost new!
It looks like your original spark plugs were Denso P/N FK20HBR11. What Denso P/N did you replace them with? The new spark plug in your picture is Denso FK20HBR8, instead of FK20HBR11. Something is really weird about this. Look at the R8 vs R11 Gap difference: 0.8mm (.032") versus 1.1mm (.044"). That's a huge gap difference (27%)!
Could Bell Lexus North Scottsdale have made a mistake with your VIN or their parts department made a mistake and sent you the wrong spark plugs for a 2013 GS 350, which you installed?
I'm showing the Lexus P/N 90919-01263 (DENSO FK20HBR8) is for the 2018-2022 Lexus LS 500h engine.
~~~~~~~~~~~~~~
Example of how to use these tools... Q: What is the difference between Denso FK20HBR8 and FK20HBR11? A:Using the Denso Numbering System, we see that the second set of numbers at the end of a part designates the gap setting. FK20HBR8 has a 0.8mm or .032" gap while FK20HBR11 has a 1.1mm or .044" gap.
The BL part number was 90919-01263 that I am reading off the receipt. (yes, I keep meticulous records)
Maybe meticulous research before purchasing and installing trumps keeping meticulous records after the purchase.
Last edited by bclexus; 04-23-23 at 12:17 PM.
Reason: orthography
I think FK20HBR11 is the 450h plug. If the GS350 was in good ignition wise condition, he could have felt a bit of increased performance with the bigger Gap across the piston in the Combustion chamber having a more complete burn..
I think FK20HBR11 is the 450h plug. If the GS350 was in good ignition wise condition, he could have felt a bit of increased performance with the bigger Gap across the piston in the Combustion chamber having a more complete burn..
@jgscott - This doesn't make any sense at all! The way I understand it, the FK20HBR11 spark plugs were the OE spark plugs he pulled from his old 2013 GS 350 when he installed new spark plugs. You say the FK20HBR11 spark plugs are for a Lexus GS 450h engine. This is correct, but only for the very early production GS 450h cars (e.g. 2007-2012).
The FK20HBR11 spark plugs were installed as original equipment in his 2013 GS 350.
So that you have a clearer understanding of the conundrum; he replaced the original equipment FK20HBR11 (1.1mm or 44" gap) spark plugs with FK20HB8 (0.8mm or 32" gap) spark plugs as the picture below indicates (used versus new).
Whether the FK20HBR11 spark plug is for an early year (e.g. 2007-2012) GS 450h engine (which I understand it is) is really irrelevant anyway because the newer model 2018 GS 450h and the 2018 LS500h both take the FK20HB8 (0.8mm gap) spark plugs. But it is this 0.8mm gap spark plug that he put in his 2013 GS 350 engine and it is not the correct spark plug for a 2013 GS 350. It should have been the 1.1mm gap spark plug.
The mystery and entailed issue came about because he was incorrectly sent - and he installed - FK20HB8 (0.8mm gap)spark plugs instead of the correct FK20HB11 (1.1mm gap) spark plugs which came factory installed in the GS 350 engine. Plan and simple - the way I understand it is - the wrong spark plugs were sent and also installed...
Last edited by bclexus; 04-23-23 at 05:19 PM.
Reason: orthography
I think FK20HBR11 is the 450h plug. If the GS350 was in good ignition wise condition, he could have felt a bit of increased performance with the bigger Gap across the piston in the Combustion chamber having a more complete burn..
Ok I don't know? So I did remember a while back looking at this and I could have swore I remembered seeing the BR11 being for the 450h a long time ago. It could have been the 3rd Gen GS, when I had my GS460. Strike what I said.
My original plugs have been gone. I run a NGK Ruthenium HX High Ignitability Spark Plug, in a Colder plug, for the max Timming Advance with my Tune. The Tuners told me to run them based on Dyno Tunes. I just looked at my old original Denso plugs and they were BR11's.
Ok I don't know? So I did remember a while back looking at this and I could have swore I remembered seeing the BR11 being for the 450h a long time ago. It could have been the 3rd Gen GS, when I had my GS460. Strike what I said.
My original plugs have been gone. I run a NGK Ruthenium HX High Ignitability Spark Plug, in a Colder plug, for the max Timming Advance with my Tune. The Tuners told me to run them based on Dyno Tunes. I just looked at my old original Denso plugs and they were BR11's.
@jgscott - That's right, you recall correctly. The older model 3rd Gen Lexus GS 450h (e.g. 2007-2012) takes the FK20HBR11 spark plugs. But the newer model Lexus GS 450h (e.g. 2013- 2018 takes the FK20HBR8 spark plugs - as does the 2018 LS500h.
Last edited by bclexus; 04-23-23 at 05:12 PM.
Reason: orthography
Bell Lexus mistakenly sent me the wrong part which I should have picked up on or they ran out of the BR11 and should have told me to re-gap the BR8.
That goes to show you don't even trust the dealership.
@PGA71 - Apparently it doesn't make a lot of difference with the gap spacing as along as the ignition system has enough oomph to arc from the electrode to shell ground to ignite the compressed air/fuel mixture. However, if it was my GS 350 I would definitely want the correct model Denso spark plugs and right gap spacing that was originally installed at the factory.
There's somebody driving around in your 2013 GS 350 with incorrect spark plugs! What are the odds he'll tell us he needs new spark plugs and be totally confused to find it has BR8 spark plugs instead of the correct BR11 spark plugs?
Last edited by bclexus; 04-23-23 at 05:11 PM.
Reason: orhography
@PGA71 - Apparently it doesn't make a lot of difference with the gap spacing as along as the ignition system has enough oomph to arc from electrode to shell ground to ignite the compressed air/fuel mixture. However, if it was my GS 350 I'd want the same model Denso spark plugs that was originally installed at the factory.
Totally agree and and if I still had it would correct it.
The ECU must compensate and wonder what changed in 2016 and newer models to require a different gap. All else in the plug specifications are the same from what I can tell from the spec sheets.
This also makes me wonder, how many unknowingly folks, go in for a job like this and inadvertently get a different specified part.
Hey I will tell you something. On just about every car forum out there, These same threads exist about what's the correct plug, for all kinds of cars? lol!
In fact there are a bunch of threads here on CL even in the LS Forum for years about the confusion and the BR11. FYI- I never just put in pre-gapped plugs. I always take a Plug Gap and measure each one myself, just to be sure it's at the Gap that the engine specifies. If not for running the Colder plugs on a Tune, I would run the original BR11 that was in the GS, from the start.
Hey I will tell you something. I never just put in pre-gapped plugs. I always take a Plug Gap and measure each one myself, just to be sure it's at the Gap that the engine specifies.
@jgscott - The heck with measuring spark plug gaps. The first thing I do when I get a new set of spark plugs is take a hack saw and cut the ground strap completely off. It makes the ignition system work a little harder to jump the spark a greater gap distance, but it doubles the mpg and adds a good 25% more horsepower...
Last edited by bclexus; 04-24-23 at 06:19 AM.
Reason: orthography
If you don't care about the emission warranty or if the car is getting close to 100k miles then there is absolutely zero need or benefit (in performance or economy) in replacing the spark plugs until the car has ¼ million miles or more on it.
Originally Posted by PGA71
Here are Iridium plugs out of my 2013 GS350 Lux at 146K miles that I changed in January 2023.
Don't look as good as those 300K mi plugs, but car was still running like day one before and after change.
Not advocating when anyone should change or not change, just posting for information.
3 Passenger side Plugs
3 Divers side Plugs
146K plug vs New Plug
Because of these two comments, I think I won't change my original sparkplugs until maybe 250,000KM now.. (I'm at 110,000KM right now)
I hope being in the super north, -20Celsius winters doesn't impact the spark plugs too much..
04-23-23, 09:56 AM
