Is this possible?

NYSpeed Automotive
1

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-

2

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

3

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

4

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

5

Yeah 2004 should be under warrenty unless your over mileage

6

i got 2k left before warantee’s up :slight_smile:

to the dealer!

thanks

-Cheater-

7

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-

8

manual says 87. Thats false advertisement

9

good point.