2014 Scion frs engine run 'hard'... - Toyota GR86, 86, FR-S and Subaru BRZ Forum & Owners Community

guardianactual · 08-14-2015, 12:28 AM

Bought this a few days ago... Put 93 in it ran fine. 110 miles on the odometer no issues till the dealer offered me a fill up and dumped 87 in it. Now it runs "hard" idling fast and harder than before...

Is it the low octane?

N1rve · 08-14-2015, 03:15 AM

Quote:

Originally Posted by guardianactual

Bought this a few days ago... Put 93 in it ran fine. 110 miles on the odometer no issues till the dealer offered me a fill up and dumped 87 in it. Now it runs "hard" idling fast and harder than before...

Is it the low octane?

Yes, FRS minimum octane is 91.

Wes · 08-14-2015, 04:30 AM

Yeah probably, but your car will adjust, just don't run it hard. Put in 93 when you get to about half a tank or something. I accidentally filled my car with half 87 before but I just took it easy and it was fine.

Tcoat · 08-14-2015, 09:46 AM

Ya a tank of 87 won't hurt anything. The ECU just pulls timing to prevent knock. Run the tank down pour some 91 or 93 in (like has been said) and give it a tank worth of time for the ECU to relearn. Every time you change octane the ECU has to relearn so don't panic during that process.

soulreapersteve · 08-14-2015, 06:07 PM

I once put 87 octane in my tank.

My car literally became as hot as lava.

shu5892001 · 08-14-2015, 06:29 PM

Ran it for a bit and you can pour in octane booster.

Streetthrowback · 08-14-2015, 09:24 PM

I once put c16 in my car, went to the moon and back in 30 min

guardianactual · 08-15-2015, 03:23 AM

Good to know. I took it on the highway and it smelled like burnt oil. Perhaps pushed it a bit?

Octane booster any recommend ones?

Also, could I mix 95 or 98 in? I ask bc Shell gave me a discount on high Octane. I think the manufacturer said 98 was safe, but I saw some on here ran urbo blue. Too pricey for m blood, but w. a discount I wont mind the nitro plus 98 unleaded.

Packofcrows · 08-15-2015, 03:29 AM

If you want to get the last tank or mostly all of it out, leave car running for bit. If you that paranoid.

08-14-2015, 12:28 AM	#1
guardianactual Junior Member Join Date: Aug 2015 Drives: 2014 Scion FRS Location: PA Posts: 2 Thanks: 0 Thanked 0 Times in 0 Posts Mentioned: 0 Post(s) Tagged: 0 Thread(s)	2014 Scion frs engine run 'hard'... Bought this a few days ago... Put 93 in it ran fine. 110 miles on the odometer no issues till the dealer offered me a fill up and dumped 87 in it. Now it runs "hard" idling fast and harder than before... Is it the low octane?

08-14-2015, 09:46 AM	#4
Tcoat Senior Member Join Date: Jul 2014 Drives: 2020 Hakone Location: London, Ont Posts: 69,841 Thanks: 61,656 Thanked 108,295 Times in 46,456 Posts Mentioned: 2499 Post(s) Tagged: 50 Thread(s)	Ya a tank of 87 won't hurt anything. The ECU just pulls timing to prevent knock. Run the tank down pour some 91 or 93 in (like has been said) and give it a tank worth of time for the ECU to relearn. Every time you change octane the ECU has to relearn so don't panic during that process. __________________ Racecar spelled backwards is Racecar, because Racecar.

08-14-2015, 06:29 PM	#6
shu5892001 Ontario's FT86 Join Date: Aug 2012 Drives: 2016 Lexus GS-F Location: Toronto Posts: 685 Thanks: 261 Thanked 165 Times in 111 Posts Mentioned: 2 Post(s) Tagged: 0 Thread(s)	Ran it for a bit and you can pour in octane booster. __________________ 2016 Lexus GS-F PPE EL Headers, Joe Z X Pipe, Tom’s Racing Drop in, RR Racing Tune, RR Racing Motor Mount, RR Racing USRS. 430WHP. 2024 Volvo XC60 T8 Recharge

08-15-2015, 03:29 AM	#9
Packofcrows hey you, yeah you <3 Join Date: Jul 2012 Drives: 2014 37J FR-S Location: Monterey County, CA Posts: 2,715 Thanks: 905 Thanked 1,259 Times in 809 Posts Mentioned: 38 Post(s) Tagged: 3 Thread(s)	If you want to get the last tank or mostly all of it out, leave car running for bit. If you that paranoid. __________________ Got my TRD wheels and TRD louvers. Thanks!!!

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08-14-2015, 04:30 AM	#3
Wes Senior Member Join Date: May 2012 Drives: JRSC'd Asphalt FR-S Location: SoCal Posts: 1,317 Thanks: 868 Thanked 436 Times in 260 Posts Mentioned: 9 Post(s) Tagged: 1 Thread(s)	Yeah probably, but your car will adjust, just don't run it hard. Put in 93 when you get to about half a tank or something. I accidentally filled my car with half 87 before but I just took it easy and it was fine.

08-14-2015, 09:24 PM	#7
Streetthrowback Senior Member Join Date: Mar 2015 Drives: 2015 brz Location: Long Island Posts: 304 Thanks: 4 Thanked 35 Times in 35 Posts Mentioned: 0 Post(s) Tagged: 0 Thread(s)	I once put c16 in my car, went to the moon and back in 30 min

08-15-2015, 03:23 AM	#8
guardianactual Junior Member Join Date: Aug 2015 Drives: 2014 Scion FRS Location: PA Posts: 2 Thanks: 0 Thanked 0 Times in 0 Posts Mentioned: 0 Post(s) Tagged: 0 Thread(s)	Good to know. I took it on the highway and it smelled like burnt oil. Perhaps pushed it a bit? Octane booster any recommend ones? Also, could I mix 95 or 98 in? I ask bc Shell gave me a discount on high Octane. I think the manufacturer said 98 was safe, but I saw some on here ran urbo blue. Too pricey for m blood, but w. a discount I wont mind the nitro plus 98 unleaded.

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