# Is this possible?

**URL:** <https://forums.speedlife.net/t/is-this-possible/1365>\
**Category:** NYSpeed Automotive\
**Created:** [August 8, 2005, 8:22am UTC](https://forums.speedlife.net/t/is-this-possible/1365 "2005-08-08T08:22:42Z")\
**Posts on this page:** 9\
**Page:** 1

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**Author:** ![Lucky\_Cheater](https://avatars.discourse-cdn.com/v4/letter/l/eb9ed0/32.png) [@Lucky\_Cheater](https://forums.speedlife.net/u/Lucky_Cheater)\
**Post date:** [August 8, 2005, 8:22am UTC](https://forums.speedlife.net/t/is-this-possible/1365/1 "2005-08-08T08:22:42Z")

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So about 2 months after I first got my 2004 ranger I noticed engine knocking during acceleration. I started putting 89 octane fuel in and the problem persisted…I upped it to 91 octane (sunoco) and the problem seemed to go away. Yesterday I was driving my brother to the airport and lo and behold…engine knocking…I’m wondering if it’s something else. It only does it when Im accelorating up hill. I just thought 91 octane would put an end to it.

its not like im driving a high performance vehicle or something, the manual says 87 octane

any thoughts?

-Cheater-

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**Author:** ![Jack](https://yyz2.discourse-cdn.com/flex034/user_avatar/forums.speedlife.net/jack/32/7613_2.png) [@Jack](https://forums.speedlife.net/u/Jack)\
**Post date:** [August 8, 2005, 8:37am UTC](https://forums.speedlife.net/t/is-this-possible/1365/2 "2005-08-08T08:37:48Z")

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I dont think it has anything to do with the octane, and you should bring it back to the dealer before you touch anything.

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**Author:** ![PumiceT](https://avatars.discourse-cdn.com/v4/letter/p/43a26b/32.png) [@PumiceT](https://forums.speedlife.net/u/PumiceT)\
**Post date:** [August 8, 2005, 8:37am UTC](https://forums.speedlife.net/t/is-this-possible/1365/3 "2005-08-08T08:37:49Z")

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Visit the dealer. It’s under warranty, no?

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**Author:** ![professorOD](https://avatars.discourse-cdn.com/v4/letter/p/a4c791/32.png) [@professorOD](https://forums.speedlife.net/u/professorOD)\
**Post date:** [August 8, 2005, 8:51am UTC](https://forums.speedlife.net/t/is-this-possible/1365/4 "2005-08-08T08:51:21Z")

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my old ass 89 does that too,I throw 93 in and it stops.

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**Author:** ![POOPRA](https://yyz2.discourse-cdn.com/flex034/user_avatar/forums.speedlife.net/poopra/32/7188_2.png) [@POOPRA](https://forums.speedlife.net/u/POOPRA)\
**Post date:** [August 8, 2005, 9:08am UTC](https://forums.speedlife.net/t/is-this-possible/1365/5 "2005-08-08T09:08:19Z")

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Yeah 2004 should be under warrenty unless your over mileage

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**Author:** ![Lucky\_Cheater](https://avatars.discourse-cdn.com/v4/letter/l/eb9ed0/32.png) [@Lucky\_Cheater](https://forums.speedlife.net/u/Lucky_Cheater)\
**Post date:** [August 8, 2005, 9:17am UTC](https://forums.speedlife.net/t/is-this-possible/1365/6 "2005-08-08T09:17:29Z")

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i got 2k left before warantee’s up 🙂

to the dealer!

thanks

-Cheater-

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**Author:** ![Lucky\_Cheater](https://avatars.discourse-cdn.com/v4/letter/l/eb9ed0/32.png) [@Lucky\_Cheater](https://forums.speedlife.net/u/Lucky_Cheater)\
**Post date:** [August 8, 2005, 11:00am UTC](https://forums.speedlife.net/t/is-this-possible/1365/7 "2005-08-08T11:00:24Z")

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I found something interesting out

my truck has a compression ratio of 9.7:1

wouldn’t that require a higher octane fuel than 87? I was under the impression that 87 octane should not be used in vehicles with compression ratios of 9.3:1 or higher?

I just don’t wanna go in bitching about knock and have the guy say “fucker, of course its knocking on 87”

the 91 still doesnt make sense though.

-Cheater-

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**Author:** ![Jack](https://yyz2.discourse-cdn.com/flex034/user_avatar/forums.speedlife.net/jack/32/7613_2.png) [@Jack](https://forums.speedlife.net/u/Jack)\
**Post date:** [August 8, 2005, 11:15am UTC](https://forums.speedlife.net/t/is-this-possible/1365/8 "2005-08-08T11:15:39Z")

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manual says 87. Thats false advertisement

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**Author:** ![Lucky\_Cheater](https://avatars.discourse-cdn.com/v4/letter/l/eb9ed0/32.png) [@Lucky\_Cheater](https://forums.speedlife.net/u/Lucky_Cheater)\
**Post date:** [August 8, 2005, 11:45am UTC](https://forums.speedlife.net/t/is-this-possible/1365/9 "2005-08-08T11:45:43Z")

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> [@Jack](#):
>
> manual says 87. Thats false advertisement

good point.