volvo s80 t6 starts better with 87 octane
#1
volvo s80 t6 starts better with 87 octane
My 99 Volvo S80 T6 starts better on 87 octane than 91/92. I'm in Hawaii, and it's all 10-15% ethanol. I know a place where I can get ethanol free gas, but haven't tried it yet. Want to wait until I pass it with empty or near empty tank.
If I put high octane in it, it sometimes takes 2 attempted starts before it cranks up in the morning.
What would be the reason for this? At first I thought it was injector o-rings, or maybe just needed a new fuel filter, but neither would make sense now that I figure out the low octane trick. Nothing else has changed. The engine runs great, better with high octane, but not much difference with low octane, about the same mpg.
Thanks for reading, I did some searching before, but found nothing.
If I put high octane in it, it sometimes takes 2 attempted starts before it cranks up in the morning.
What would be the reason for this? At first I thought it was injector o-rings, or maybe just needed a new fuel filter, but neither would make sense now that I figure out the low octane trick. Nothing else has changed. The engine runs great, better with high octane, but not much difference with low octane, about the same mpg.
Thanks for reading, I did some searching before, but found nothing.
#2
Well higher octane gas resists detonation, but im not sure why it starts better for you on 87,,
i am actually going to ask you something unrelated, can you please talk some more about the difference you feel between 87 and 91 ? i am considering switching to 87 , but im afraid to harm the turbos , i know how the system works and had cars in the past that too premium, but neither of them had turbos. Just wondering if its all a placebo effect or if you actually can tell the difference...
i am actually going to ask you something unrelated, can you please talk some more about the difference you feel between 87 and 91 ? i am considering switching to 87 , but im afraid to harm the turbos , i know how the system works and had cars in the past that too premium, but neither of them had turbos. Just wondering if its all a placebo effect or if you actually can tell the difference...
#3
I think there is something wrong with the 92 that I buy. The 87 seems to give it more torque while the 92 seems to give it more high rpm power. I admittedly rag my car out a good bit but prefer the low end power to get it spun up more quickly.
I will test different high octane and repost but I'm happy with the 87 just wanted to know why it starts better. Want to fix it so it starts better no matter the grade.
I will test different high octane and repost but I'm happy with the 87 just wanted to know why it starts better. Want to fix it so it starts better no matter the grade.
#4
#5
These cars are designed to run on 91 or higher octane, this isn't a matter of running a car designed for 87 and running 91, which will have no effect.
In essence, you are getting pre-detonation, but the car has retarded the timing to adjust for the lower octane. But there is a reason your car is not running right with the designed specification of fuel.
#7
#8
ya my lexus can also run on either on low or higher octane. I mean its a lexus so nothing about performance so i choose lower octane. It runs fine. no problems hardly notice any slow performance. But on a Volvo higher the better. So i have been putting a "medium" octane. Like 89
#9
#10
I bought some new plugs, the ones in Volvo package. Maybe that will help. I want to run the higher octane but want the starting issues to go away.
#12
I'm all for saving money, when it's logical. You're better off driving slower, avoiding jack-rabbiting, keeping the car in proper running order (ie. proper maintnenance and keeping the tires properly inflated) then using lower then recommended octane.
#13
I guess Volvo original OEM batteries are actually pretty awesome. It must have been the original battery from 1999. I replaced the battery, and thought 'hmmm, I'll try high octane since it's near empty' and wouldn't you know it? It starts up just fine. Soooo... long story short, after several replies and lots of time, it just needed a new battery. Probably had a dead cell. Sometimes it's just the simple stuff... but, now I got a coolant problem, gonna start a new thread.
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