Masterbiscuit

To tell you the truth, I have a 94 Cherokee 4.0 I6
and I find that with 87 it runs just fine, but it seems
to run slightly better on 89. A little better on the power
and gas mileage. As far as companies go, I'd say to shop
around. Usually the expensive gas isn't always the best.
But try a few places, and see for yourself how your
Wrangler responds. You might be suprised.

GL with the TJ


<samos@sympatico.ca> wrote in message
news:fshjlv0kb996m889pg6l97f76perekmrve@4ax.com...
>
> I have a new Wrangler/TJ Sport ... 6 cylinders, automatic transmission
> .... what type of gas should I be buying ... regular? medium?
> Sorry for such a basic question.
> Many thanks


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Earle Horton

We have been through this before in this newsgroup. I believe that the
verdict was that some year models had knock sensors, which would indeed
allow them to run better on premium than on regular, assuming that the
programming and timing adjustment allows for this. The newer models on the
other hand do not have knock sensors, and will run great on anything that
does not make them "ping." That includes TJ's.

Earle

"Masterbiscuit" <masterbiscuit@hotmail.com> wrote in message
news:71S6b.59450$Ay2.18180149@news4.srv.hcvlny.cv. net...
> To tell you the truth, I have a 94 Cherokee 4.0 I6
> and I find that with 87 it runs just fine, but it seems
> to run slightly better on 89. A little better on the power
> and gas mileage. As far as companies go, I'd say to shop
> around. Usually the expensive gas isn't always the best.
> But try a few places, and see for yourself how your
> Wrangler responds. You might be suprised.
>
> GL with the TJ
>
>
> <samos@sympatico.ca> wrote in message
> news:fshjlv0kb996m889pg6l97f76perekmrve@4ax.com...
> >
> > I have a new Wrangler/TJ Sport ... 6 cylinders, automatic transmission
> > .... what type of gas should I be buying ... regular? medium?
> > Sorry for such a basic question.
> > Many thanks
>
>
> ---
> Outgoing mail is certified Virus Free.
> Checked by AVG anti-virus system (http://www.grisoft.com).
> Version: 6.0.512 / Virus Database: 309 - Release Date: 8/19/2003
>
>

Earle Horton

We have been through this before in this newsgroup. I believe that the
verdict was that some year models had knock sensors, which would indeed
allow them to run better on premium than on regular, assuming that the
programming and timing adjustment allows for this. The newer models on the
other hand do not have knock sensors, and will run great on anything that
does not make them "ping." That includes TJ's.

Earle

"Masterbiscuit" <masterbiscuit@hotmail.com> wrote in message
news:71S6b.59450$Ay2.18180149@news4.srv.hcvlny.cv. net...
> To tell you the truth, I have a 94 Cherokee 4.0 I6
> and I find that with 87 it runs just fine, but it seems
> to run slightly better on 89. A little better on the power
> and gas mileage. As far as companies go, I'd say to shop
> around. Usually the expensive gas isn't always the best.
> But try a few places, and see for yourself how your
> Wrangler responds. You might be suprised.
>
> GL with the TJ
>
>
> <samos@sympatico.ca> wrote in message
> news:fshjlv0kb996m889pg6l97f76perekmrve@4ax.com...
> >
> > I have a new Wrangler/TJ Sport ... 6 cylinders, automatic transmission
> > .... what type of gas should I be buying ... regular? medium?
> > Sorry for such a basic question.
> > Many thanks
>
>
> ---
> Outgoing mail is certified Virus Free.
> Checked by AVG anti-virus system (http://www.grisoft.com).
> Version: 6.0.512 / Virus Database: 309 - Release Date: 8/19/2003
>
>

Earle Horton

Advancing the timing might make your engine run better. If you put higher
octane fuel in, and the knock sensor was keeping the timing retarded, then
you might realize some benefit.

Earle

"Kevin in San Diego" <kevin_hedstrom@yahoo.com> wrote in message
news:A8T6b.47326$Qy4.35560@fed1read05...
> Doesn't the knock sensor allow the motor to run on lower octane, it just
> retards the timing a bit or something? Even my old 88 4.0 has a sensor, it
> runs fine on 87. I think you only need high octane in high compression
> engines.
> KH
>
> "Earle Horton" <enfermero_diabolico@registerednurses.com> wrote in message
> news:bjgql8$irpqc$1@ID-147790.news.uni-berlin.de...
> > We have been through this before in this newsgroup. I believe that the
> > verdict was that some year models had knock sensors, which would indeed
> > allow them to run better on premium than on regular, assuming that the
> > programming and timing adjustment allows for this. The newer models on
> the
> > other hand do not have knock sensors, and will run great on anything
that
> > does not make them "ping." That includes TJ's.
> >
> > Earle
> >
> > "Masterbiscuit" <masterbiscuit@hotmail.com> wrote in message
> > news:71S6b.59450$Ay2.18180149@news4.srv.hcvlny.cv. net...
> > > To tell you the truth, I have a 94 Cherokee 4.0 I6
> > > and I find that with 87 it runs just fine, but it seems
> > > to run slightly better on 89. A little better on the power
> > > and gas mileage. As far as companies go, I'd say to shop
> > > around. Usually the expensive gas isn't always the best.
> > > But try a few places, and see for yourself how your
> > > Wrangler responds. You might be suprised.
> > >
> > > GL with the TJ
> > >
> > >
> > > <samos@sympatico.ca> wrote in message
> > > news:fshjlv0kb996m889pg6l97f76perekmrve@4ax.com...
> > > >
> > > > I have a new Wrangler/TJ Sport ... 6 cylinders, automatic
transmission
> > > > .... what type of gas should I be buying ... regular? medium?
> > > > Sorry for such a basic question.
> > > > Many thanks
> > >
> > >
> > > ---
> > > Outgoing mail is certified Virus Free.
> > > Checked by AVG anti-virus system (http://www.grisoft.com).
> > > Version: 6.0.512 / Virus Database: 309 - Release Date: 8/19/2003
> > >
> > >
> >
> >
>
>

Earle Horton

Advancing the timing might make your engine run better. If you put higher
octane fuel in, and the knock sensor was keeping the timing retarded, then
you might realize some benefit.

Earle

"Kevin in San Diego" <kevin_hedstrom@yahoo.com> wrote in message
news:A8T6b.47326$Qy4.35560@fed1read05...
> Doesn't the knock sensor allow the motor to run on lower octane, it just
> retards the timing a bit or something? Even my old 88 4.0 has a sensor, it
> runs fine on 87. I think you only need high octane in high compression
> engines.
> KH
>
> "Earle Horton" <enfermero_diabolico@registerednurses.com> wrote in message
> news:bjgql8$irpqc$1@ID-147790.news.uni-berlin.de...
> > We have been through this before in this newsgroup. I believe that the
> > verdict was that some year models had knock sensors, which would indeed
> > allow them to run better on premium than on regular, assuming that the
> > programming and timing adjustment allows for this. The newer models on
> the
> > other hand do not have knock sensors, and will run great on anything
that
> > does not make them "ping." That includes TJ's.
> >
> > Earle
> >
> > "Masterbiscuit" <masterbiscuit@hotmail.com> wrote in message
> > news:71S6b.59450$Ay2.18180149@news4.srv.hcvlny.cv. net...
> > > To tell you the truth, I have a 94 Cherokee 4.0 I6
> > > and I find that with 87 it runs just fine, but it seems
> > > to run slightly better on 89. A little better on the power
> > > and gas mileage. As far as companies go, I'd say to shop
> > > around. Usually the expensive gas isn't always the best.
> > > But try a few places, and see for yourself how your
> > > Wrangler responds. You might be suprised.
> > >
> > > GL with the TJ
> > >
> > >
> > > <samos@sympatico.ca> wrote in message
> > > news:fshjlv0kb996m889pg6l97f76perekmrve@4ax.com...
> > > >
> > > > I have a new Wrangler/TJ Sport ... 6 cylinders, automatic
transmission
> > > > .... what type of gas should I be buying ... regular? medium?
> > > > Sorry for such a basic question.
> > > > Many thanks
> > >
> > >
> > > ---
> > > Outgoing mail is certified Virus Free.
> > > Checked by AVG anti-virus system (http://www.grisoft.com).
> > > Version: 6.0.512 / Virus Database: 309 - Release Date: 8/19/2003
> > >
> > >
> >
> >
>
>

Lon Stowell

Approximately 9/7/03 19:43, Masterbiscuit uttered for posterity:

> To tell you the truth, I have a 94 Cherokee 4.0 I6
> and I find that with 87 it runs just fine, but it seems
> to run slightly better on 89. A little better on the power
> and gas mileage. As far as companies go, I'd say to shop
> around. Usually the expensive gas isn't always the best.
> But try a few places, and see for yourself how your
> Wrangler responds. You might be suprised.
>

Dunno who else notices this, but have a similar issue, the
I-6 pings mildly with California versions of 87 and stepping
up to 89 seems to cure this. Once east of Nevada, it seems
to run well on 87 even at high Utah/Colorado altitudes.
No idea why.

Lon Stowell

Approximately 9/7/03 19:43, Masterbiscuit uttered for posterity:

> To tell you the truth, I have a 94 Cherokee 4.0 I6
> and I find that with 87 it runs just fine, but it seems
> to run slightly better on 89. A little better on the power
> and gas mileage. As far as companies go, I'd say to shop
> around. Usually the expensive gas isn't always the best.
> But try a few places, and see for yourself how your
> Wrangler responds. You might be suprised.
>

Dunno who else notices this, but have a similar issue, the
I-6 pings mildly with California versions of 87 and stepping
up to 89 seems to cure this. Once east of Nevada, it seems
to run well on 87 even at high Utah/Colorado altitudes.
No idea why.

Lon Stowell

Approximately 9/7/03 20:58, Kevin in San Diego uttered for posterity:

> Doesn't the knock sensor allow the motor to run on lower octane, it just
> retards the timing a bit or something? Even my old 88 4.0 has a sensor, it
> runs fine on 87. I think you only need high octane in high compression
> engines.
> KH

Do any of the Jeep engines even have knock sensors?

Having put a hole in a piston oncet, don't think I'd care to own
a turbo engine without one, as they also cut boost, richen mix,
whilst cutting advance on most of those.

Lon Stowell

Approximately 9/7/03 20:58, Kevin in San Diego uttered for posterity:

> Doesn't the knock sensor allow the motor to run on lower octane, it just
> retards the timing a bit or something? Even my old 88 4.0 has a sensor, it
> runs fine on 87. I think you only need high octane in high compression
> engines.
> KH

Do any of the Jeep engines even have knock sensors?

Having put a hole in a piston oncet, don't think I'd care to own
a turbo engine without one, as they also cut boost, richen mix,
whilst cutting advance on most of those.

Earle Horton

"Lon Stowell" <lon.stowell@comcast.net> wrote in message
news:Rv27b.391517$YN5.258656@sccrnsc01...
> Approximately 9/7/03 19:43, Masterbiscuit uttered for posterity:
>
> > To tell you the truth, I have a 94 Cherokee 4.0 I6
> > and I find that with 87 it runs just fine, but it seems
> > to run slightly better on 89. A little better on the power
> > and gas mileage. As far as companies go, I'd say to shop
> > around. Usually the expensive gas isn't always the best.
> > But try a few places, and see for yourself how your
> > Wrangler responds. You might be suprised.
> >
>
> Dunno who else notices this, but have a similar issue, the
> I-6 pings mildly with California versions of 87 and stepping
> up to 89 seems to cure this. Once east of Nevada, it seems
> to run well on 87 even at high Utah/Colorado altitudes.
> No idea why.
>
You have more air down there, and the effect is similar to being at the same
altitude but with a greater compression ratio. "Regular" is 85 or 86 octane
up here, and most of the newer fuel injected cars seem to run fine on it.

Earle