I've been doing great with Conoco or Texaco 87 octane in mine-doing 1/4
hwy and 3/4 city driving.
I passed 12,000 miles today and my last tank got 20 mpg! But, have
thought about going to
the 89 octane, as it's knocking a little bit with the a/c cranking.
--
Bugs
Austin, TX (y'all)
TJ Sport/30"
My Little TJ Page at
http://www.io.com/guerilla/jeep/mytj.html
YO Jeep Jamboree pages at
http://www.io.com/guerilla/jeep/yo.html
Check out my company, Guerilla Audio
http://www.io.com/guerilla
Your service manager is one of many who doesn't understand octane. The
TJ's 4.0L engine is designed for 87 octane. Going to a higher octane
won't improve anything... not acceleration, power, cleanliness, etc.
All additional octane does is stop pinging, when the gasoline is
igniting prematurely for various reasons, ususually running too low of
an octane in a high-compression engine, which the 4.0L is not.
Occasional pinging (VERY occasional) when accelerating under load is
normal if it doesn't also occur in normal driving circumstances. Some
people feel higher octane makes their engine run cleaner, last longer,
etc. since be cause it costs more, it *has* to be better... it's not.
The only advantage to running higher octane than your engine needs is to
pump up the oil company's profitability LOL!
Regards,
Jerry
--
NOTE: To reply, remove the "NOSPAM" from my email address.
Jerry Bransford
PP-ASEL, C.A.P., KC6TAY
The Zen hotdog... make me one with everything!
I own a 97 TJ Sport with 4.0L and Auto transmission. I have to use 89
octane. If I use 87 octane, my engine pings on uphills and under
acceleration. I have had 4 seperate dealerships look at it and they all
say there is nothing wrong with it. They say it is bad gas. It's
amazing how not a single gas station in town has good gas, because I
have tried a few tanks full of 87 octane from every station in town.
Does anyone else have this problem? If so, has anyone's dealership
actually fixed it?
TX JEEPER wrote:
>
> Stuart Singer wrote:
> >
> > I'm curious what octane people are putting in their Jeeps. I have a
> > TJ Sport. The service manager tells me to use 89 or 93. The manual
> > says minimum 87 which suggests higher may be better? I do mostly local
> > start and stop driving. BTW, I'm averaging 15.2 MPG so far at 1250
> > miles.
> >
>
> I've been doing great with Conoco or Texaco 87 octane in mine-doing 1/4
> hwy and 3/4 city driving.
> I passed 12,000 miles today and my last tank got 20 mpg! But, have
> thought about going to
> the 89 octane, as it's knocking a little bit with the a/c cranking.
> --
> Bugs
> Austin, TX (y'all)
>
> TJ Sport/30"
>
> My Little TJ Page at
> http://www.io.com/guerilla/jeep/mytj.html
>
> YO Jeep Jamboree pages at
> http://www.io.com/guerilla/jeep/yo.html
>
> Check out my company, Guerilla Audio
> http://www.io.com/guerilla
I was told that 87 was the proper octane to use. If you have a 4.0 and
you have an engine knock you may have an engine problem. The early TJ's
(built in 1996) had some problems that Chrysler had fixed in later
production. But there is a fix for it which Chysler faxed to my
dealership.
Mike.
--
Just remove the !! from my email address to send me mail.
1991 YJ 4.0L
31x10R15 Tires with Lock-Right Rear
There's more to life than gas mileage!
John <wran...@oztech.com> wrote in article <3366F2...@oztech.com>...
> Stuart Singer wrote:
> >
> > I'm curious what octane people are putting in their Jeeps. I have a
> > TJ Sport. The service manager tells me to use 89 or 93. The manual
> > says minimum 87 which suggests higher may be better? I do mostly local
> > start and stop driving. BTW, I'm averaging 15.2 MPG so far at 1250
> > miles.
>
TX JEEPER wrote:
>
> Stuart Singer wrote:
> >
> > I'm curious what octane people are putting in their Jeeps. I have a
> > TJ Sport. The service manager tells me to use 89 or 93. The manual
> > says minimum 87 which suggests higher may be better? I do mostly local
> > start and stop driving. BTW, I'm averaging 15.2 MPG so far at 1250
> > miles.
> >
>
> I've been doing great with Conoco or Texaco 87 octane in mine-doing 1/4
> hwy and 3/4 city driving.
> I passed 12,000 miles today and my last tank got 20 mpg! But, have
> thought about going to
> the 89 octane, as it's knocking a little bit with the a/c cranking.
> --
> Bugs
> Austin, TX (y'all)
>
> TJ Sport/30"
Interesting thing. I know a guy who worked for a while as an assistant
manager of an Exxon station. He told me that they paid the same for all
grades, just marked it up at the pump.