Approximately 11/12/03 16:44, John R uttered for posterity:

> Bill, All,
>
> While we're somewhat on the subject, I have an '03 TJ I6 that will
> provide me with bothersome "spark knock" at 2300-2400 RPMs on the
> highway in 5th on the flats. As soon as I accelerate, it goes away.
> Whassup with that? I've been using the same gas since I bought it a
> year ago and was advised by one of the mechanics to NOT burn 92-93
> octane as it is not as volitile as 89 octane.

I also have a 95 4.0 that likes to go tickaticka every now and
then, mostly around town. Doesn't last more than half a dozen
ticks. Dunno where you'd get 92-93 octane, most premium is '91.
And the ticks in mine go away if I just move up to midgrade
rather than regular. Someday I'll try an octane additive just
for grins. Doesn't tick at all pulling any of the backroad
grades in the Sierras or high Utah desert, just down near
sealevel in the Bay area. Suspect it is the crappy gas required
by CARB. As for not burning premium due to not being as volatile,
no real relationship between octane and volatility... and if
your gas don't vaporize, your fuel injection is busted.



--
My governor can kick your governor's ***

 

Approximately 11/12/03 16:44, John R uttered for posterity:

> Bill, All,
>
> While we're somewhat on the subject, I have an '03 TJ I6 that will
> provide me with bothersome "spark knock" at 2300-2400 RPMs on the
> highway in 5th on the flats. As soon as I accelerate, it goes away.
> Whassup with that? I've been using the same gas since I bought it a
> year ago and was advised by one of the mechanics to NOT burn 92-93
> octane as it is not as volitile as 89 octane.

I also have a 95 4.0 that likes to go tickaticka every now and
then, mostly around town. Doesn't last more than half a dozen
ticks. Dunno where you'd get 92-93 octane, most premium is '91.
And the ticks in mine go away if I just move up to midgrade
rather than regular. Someday I'll try an octane additive just
for grins. Doesn't tick at all pulling any of the backroad
grades in the Sierras or high Utah desert, just down near
sealevel in the Bay area. Suspect it is the crappy gas required
by CARB. As for not burning premium due to not being as volatile,
no real relationship between octane and volatility... and if
your gas don't vaporize, your fuel injection is busted.



--
My governor can kick your governor's ***

 

Approximately 11/12/03 16:44, John R uttered for posterity:

> Bill, All,
>
> While we're somewhat on the subject, I have an '03 TJ I6 that will
> provide me with bothersome "spark knock" at 2300-2400 RPMs on the
> highway in 5th on the flats. As soon as I accelerate, it goes away.
> Whassup with that? I've been using the same gas since I bought it a
> year ago and was advised by one of the mechanics to NOT burn 92-93
> octane as it is not as volitile as 89 octane.

I also have a 95 4.0 that likes to go tickaticka every now and
then, mostly around town. Doesn't last more than half a dozen
ticks. Dunno where you'd get 92-93 octane, most premium is '91.
And the ticks in mine go away if I just move up to midgrade
rather than regular. Someday I'll try an octane additive just
for grins. Doesn't tick at all pulling any of the backroad
grades in the Sierras or high Utah desert, just down near
sealevel in the Bay area. Suspect it is the crappy gas required
by CARB. As for not burning premium due to not being as volatile,
no real relationship between octane and volatility... and if
your gas don't vaporize, your fuel injection is busted.



--
My governor can kick your governor's ***

 

You have less octane at altitude because you have less oxygen and
money.
God Bless America, ßill O|||||||O
mailto:-------------------- http://www.----------.com/

Lon Stowell wrote:
>
> I also have a 95 4.0 that likes to go tickaticka every now and
> then, mostly around town. Doesn't last more than half a dozen
> ticks. Dunno where you'd get 92-93 octane, most premium is '91.
> And the ticks in mine go away if I just move up to midgrade
> rather than regular. Someday I'll try an octane additive just
> for grins. Doesn't tick at all pulling any of the backroad
> grades in the Sierras or high Utah desert, just down near
> sealevel in the Bay area. Suspect it is the crappy gas required
> by CARB. As for not burning premium due to not being as volatile,
> no real relationship between octane and volatility... and if
> your gas don't vaporize, your fuel injection is busted.
>
> --
> My governor can kick your governor's ***

 

You have less octane at altitude because you have less oxygen and
money.
God Bless America, ßill O|||||||O
mailto:-------------------- http://www.----------.com/

Lon Stowell wrote:
>
> I also have a 95 4.0 that likes to go tickaticka every now and
> then, mostly around town. Doesn't last more than half a dozen
> ticks. Dunno where you'd get 92-93 octane, most premium is '91.
> And the ticks in mine go away if I just move up to midgrade
> rather than regular. Someday I'll try an octane additive just
> for grins. Doesn't tick at all pulling any of the backroad
> grades in the Sierras or high Utah desert, just down near
> sealevel in the Bay area. Suspect it is the crappy gas required
> by CARB. As for not burning premium due to not being as volatile,
> no real relationship between octane and volatility... and if
> your gas don't vaporize, your fuel injection is busted.
>
> --
> My governor can kick your governor's ***

 

You have less octane at altitude because you have less oxygen and
money.
God Bless America, ßill O|||||||O
mailto:-------------------- http://www.----------.com/

Lon Stowell wrote:
>
> I also have a 95 4.0 that likes to go tickaticka every now and
> then, mostly around town. Doesn't last more than half a dozen
> ticks. Dunno where you'd get 92-93 octane, most premium is '91.
> And the ticks in mine go away if I just move up to midgrade
> rather than regular. Someday I'll try an octane additive just
> for grins. Doesn't tick at all pulling any of the backroad
> grades in the Sierras or high Utah desert, just down near
> sealevel in the Bay area. Suspect it is the crappy gas required
> by CARB. As for not burning premium due to not being as volatile,
> no real relationship between octane and volatility... and if
> your gas don't vaporize, your fuel injection is busted.
>
> --
> My governor can kick your governor's ***

 

Approximately 11/12/03 17:23, L.W.(ßill) ------ III uttered for posterity:

> You have less octane at altitude because you have less oxygen and
> money.

1. I't don't ticka ticka at altitude, just around sea level.

2. I'm pretty sure both Reno and Las Vegas are at lower altitude
than the Sonora or Kit Carson pass, so that won't be the cause
either.

--
My governor can kick your governor's ***

 

Approximately 11/12/03 17:23, L.W.(ßill) ------ III uttered for posterity:

> You have less octane at altitude because you have less oxygen and
> money.

1. I't don't ticka ticka at altitude, just around sea level.

2. I'm pretty sure both Reno and Las Vegas are at lower altitude
than the Sonora or Kit Carson pass, so that won't be the cause
either.

--
My governor can kick your governor's ***

 

Approximately 11/12/03 17:23, L.W.(ßill) ------ III uttered for posterity:

> You have less octane at altitude because you have less oxygen and
> money.

1. I't don't ticka ticka at altitude, just around sea level.

2. I'm pretty sure both Reno and Las Vegas are at lower altitude
than the Sonora or Kit Carson pass, so that won't be the cause
either.

--
My governor can kick your governor's ***

 

Lon Stowell did pass the time by typing:
> Approximately 11/12/03 17:23, L.W.(ßill) ------ III uttered for posterity:
>
>> You have less octane at altitude because you have less oxygen and
>> money.
>
> 1. I't don't ticka ticka at altitude, just around sea level.

Use a higher octane at sea level.


The higher you go the lower your compression will be and
so you can use lower octane.

I run 87 when in Colorado Springs. But have to run 93 and stay
out of max boost when down in Biloxi Mississippi.

--
-- DougW -- 93 ZJ 4.0 http://members.***.net/wilsond
HESCO Supercharger - 300W IASCA Stereo - Edelbrock IAS Shocks
Gibson Exhaust - rear DCpower - custom gauge install - Stillen Rotors