going from 91 to 87 gave me CEL! FLAME ON - Page 2 - Toyota Yaris Forums

Tamago · 05-23-2009, 12:20 AM

Quote:

Originally Posted by Kal-El

Why do some of you insist on using high octane? The Yaris was designed and calibrated to run on regular 87. Using premium may do the same type of long term harm as using regular in a car that requires premium.

And why waste the money?

you don't really understand petrol do you

mikenacarato · 05-23-2009, 12:27 AM

premium in any car wont hurt, using a too low octane rating will cause pinging.

Yaris Hilton · 05-23-2009, 09:42 AM

Octane boosters containing MMT may cause your catalysts to fail prematurely, and can clog them up severely so the engine can't breathe. That reddish stuff you see on the plugs is manganese oxide, and it's a lot worse on the catalyst than on the plugs.

07WYarisRS · 05-23-2009, 10:06 AM

Quote:

Originally Posted by mikenacarato

your wrong, why do you think we cant put race fuel in our cars for extended periods of time...it will burn them up because they will run too hot.

race fuel does not burn hotter
race fuel in a regular engine will make less hp and run cooler. the flash point is to high and the engine will not burn it efficiently

1stToyota · 05-23-2009, 11:13 AM

Quote:

Originally Posted by mikenacarato

premium in any car wont hurt, using a too low octane rating will cause pinging.

There are TSBs out there for using premium in cars that are tuned for 87 octane; Lincoln for example...causes excessive cranking times.

ROCKLAND TOYOTA · 05-23-2009, 02:28 PM

Quote:

Originally Posted by 1stToyota

There are TSBs out there for using premium in cars that are tuned for 87 octane; Lincoln for example...causes excessive cranking times.

always gotta through that domestic car knowledge in there.....

mchllp925 · 05-23-2009, 02:51 PM

Just something I found on the net.
Whether you believe this or not, it may help with this debate on octane.

Octane levels rate the different types of gasoline available. The number signifies the burning properties the fuel will produce when it reaches your engine
. The standard octanes are 87, 89 and 91. The higher the octane rating the cleaner the fuel burns in your engine. Because of the clarity of the fuel, those with higher octane levels burn faster.

For cost effectiveness when gas prices are high, even if you normally use a higher octane, you can safely run your car on 87 octane and see no ill effects. In most cars performance won’t diminish. However, when used on a regular basis, over time there will be some amount of buildup in your fuel injectors. Because it is the lowest grade of fuel, manufacturers have designed all their vehicles to run on 87 octane. Auto makers will recommend that you use premium or supreme in some cars; but realistically the system is designed to run solely on 87 octane.

Both 89 and 91 octanes are faster, cleaner burning fuels that will help reduce and eliminate buildup on your fuel injection system. If you do a considerable amount of driving it would be wise to consider using these on a regular basis, because of the wear and tear to which your engine is exposed. High performance vehicles should be run on higher octane fuel to help keep the engine running in top condition. For example, you can safely run 87 octane in a Ford Escort for the life of the car and not really see any difference. However, if you usually drive a Chevy Corvette, 91 octane will be beneficial to you and the car. It’s safe to say that if you’ve spent that much money on a car you’re going to do everything you can to keep it in tip top shape.

What’s the safe grade for your car? If you do an average amount of driving; meaning you put the normal ten to fifteen thousand miles on your car each year, 87 octane will be fine. As a preventative measure, it’s a good idea to fill up with 89 or 91 octane once in a while. Once a month should be just fine and will accomplish a good cleaning of the fuel injectors in your vehicle. Any buildup will be removed and you may notice a change in performance and fuel economy as well. A good fuel injector cleaner or gas additive will do the same thing. Ask your local auto supply or mechanic to recommend one that suits your car and the performance you’ll want to get out of the treatment. If you choose the additive route, you’ll want to include it once a month as well just as you would a tank of high-octane gasoline.

For people who normally put substantial miles on their vehicle each year whether for work or otherwise, higher octanes will be beneficial to your vehicle. Just as oil changes extend the life of your motor, higher octane fuels help the engine to run smoother and reduce the wear and tear on the motor considerably in vehicles that are used a lot. Buildup from low octane reduces your fuel economy and makes the engine have to work that much harder to accommodate your driving needs.

The owner’s manual for your vehicle will provide the recommendations for your car. If there are any certain guidelines they provide you can follow those as well. Being that your car is the second biggest investment in your life, it’s best to listen to the manufacturer’s recommendations.

Bob Dog · 05-24-2009, 02:28 AM

I've alomst 25,000 miles over the past two years with never anything but 87 octane. Likely you came across a gas station ( you said you were on a long drive) , other than one of your usual ones, that had contamination in the fuel.

DerFlosser · 05-24-2009, 10:31 AM

These threads are getting old.....why would somebody buy an econoncar designed to run on 87 and put in 91 or 93? It's counter-productive and counterintuitive. The car is designed to run on economy fuel. Now...for the question at the top of the thread...likely a coincidence that you have a CEL after changing fuel grade(s).

1stToyota · 05-24-2009, 10:38 AM

Quote:

Originally Posted by ROCKLAND TOYOTA

always gotta through that domestic car knowledge in there.....

He said premium in any car

1stToyota · 05-24-2009, 10:42 AM

Quote:

Originally Posted by DerFlosser

These threads are getting old.....why would somebody buy an econoncar designed to run on 87 and put in 91 or 93? It's counter-productive and counterintuitive. The car is designed to run on economy fuel. Now...for the question at the top of the thread...likely a coincidence that you have a CEL after changing fuel grade(s).

Yeah, I filled up 2 times in a row with mid-grade, funny, first time I've ever noticed a rough idle.

05-23-2009, 02:51 PM	#25
mchllp925 Darrin View User's Garage Drives: 2008 yaris le h/b Join Date: Nov 2008 Location: winnipeg, MB Posts: 33	My 2 Cents Worth Just something I found on the net. Whether you believe this or not, it may help with this debate on octane. Octane levels rate the different types of gasoline available. The number signifies the burning properties the fuel will produce when it reaches your engine . The standard octanes are 87, 89 and 91. The higher the octane rating the cleaner the fuel burns in your engine. Because of the clarity of the fuel, those with higher octane levels burn faster. For cost effectiveness when gas prices are high, even if you normally use a higher octane, you can safely run your car on 87 octane and see no ill effects. In most cars performance won’t diminish. However, when used on a regular basis, over time there will be some amount of buildup in your fuel injectors. Because it is the lowest grade of fuel, manufacturers have designed all their vehicles to run on 87 octane. Auto makers will recommend that you use premium or supreme in some cars; but realistically the system is designed to run solely on 87 octane. Both 89 and 91 octanes are faster, cleaner burning fuels that will help reduce and eliminate buildup on your fuel injection system. If you do a considerable amount of driving it would be wise to consider using these on a regular basis, because of the wear and tear to which your engine is exposed. High performance vehicles should be run on higher octane fuel to help keep the engine running in top condition. For example, you can safely run 87 octane in a Ford Escort for the life of the car and not really see any difference. However, if you usually drive a Chevy Corvette, 91 octane will be beneficial to you and the car. It’s safe to say that if you’ve spent that much money on a car you’re going to do everything you can to keep it in tip top shape. What’s the safe grade for your car? If you do an average amount of driving; meaning you put the normal ten to fifteen thousand miles on your car each year, 87 octane will be fine. As a preventative measure, it’s a good idea to fill up with 89 or 91 octane once in a while. Once a month should be just fine and will accomplish a good cleaning of the fuel injectors in your vehicle. Any buildup will be removed and you may notice a change in performance and fuel economy as well. A good fuel injector cleaner or gas additive will do the same thing. Ask your local auto supply or mechanic to recommend one that suits your car and the performance you’ll want to get out of the treatment. If you choose the additive route, you’ll want to include it once a month as well just as you would a tank of high-octane gasoline. For people who normally put substantial miles on their vehicle each year whether for work or otherwise, higher octanes will be beneficial to your vehicle. Just as oil changes extend the life of your motor, higher octane fuels help the engine to run smoother and reduce the wear and tear on the motor considerably in vehicles that are used a lot. Buildup from low octane reduces your fuel economy and makes the engine have to work that much harder to accommodate your driving needs. The owner’s manual for your vehicle will provide the recommendations for your car. If there are any certain guidelines they provide you can follow those as well. Being that your car is the second biggest investment in your life, it’s best to listen to the manufacturer’s recommendations.

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05-23-2009, 12:27 AM	#20
mikenacarato SIPNDEW View User's Garage Drives: 15 STI Join Date: Oct 2008 Location: Brentwood, TN Posts: 2,281	premium in any car wont hurt, using a too low octane rating will cause pinging.

05-23-2009, 09:42 AM	#21
Yaris Hilton Half a Bubble Off Plumb Drives: 2009 Yaris Sedan Join Date: Mar 2009 Location: Bristol, Tennessee, USA Posts: 1,593	Octane boosters containing MMT may cause your catalysts to fail prematurely, and can clog them up severely so the engine can't breathe. That reddish stuff you see on the plugs is manganese oxide, and it's a lot worse on the catalyst than on the plugs.

05-24-2009, 02:28 AM	#26
Bob Dog DARK PHASE OF THE MOON Drives: 07 liftback Join Date: Apr 2009 Location: the Boondocks, NC Posts: 993	I've alomst 25,000 miles over the past two years with never anything but 87 octane. Likely you came across a gas station ( you said you were on a long drive) , other than one of your usual ones, that had contamination in the fuel.

05-24-2009, 10:31 AM	#27
DerFlosser Drives: Yaris Join Date: Apr 2009 Location: USA Posts: 355	These threads are getting old.....why would somebody buy an econoncar designed to run on 87 and put in 91 or 93? It's counter-productive and counterintuitive. The car is designed to run on economy fuel. Now...for the question at the top of the thread...likely a coincidence that you have a CEL after changing fuel grade(s).