Roughly 3/4/04 14:48, Kurt Dorsey's monkeys randomly typed:

> Question for you all, I Bought my TJ in CA back in 01'. Back in Dec I
> moved to Texas, and notice my jeep now pings under load when I put in
> my normal reg. Gas (87 oct). This is the same gas I have used for the
> entire life of the jeep.. so now I tried to put in mid grade (89 oct)
> and it works just fine. Anyone have any ideas? Is there anything
> that is on the TJ for CA Emissions that I might be able to tweak or
> take off now that I am in Texas?

Part of the problem could be the very recent downward drastic
movement in what passes for quality in gasoline brews. All the
oil companies out here [Kalifornia] claim that the new ethanol
blends are superior yada yada yada. A couple also claim that
adding minor amounts of ethanol to gasoline stock will improve
the octane rating by a few points. Perhaps I've become too
cynical but to me that tells me that they are now using even
crappier base stocks with the ethanol, as there is no monetary
advantage for them to exceed the pump rating.

With a 4.0 I have always had an extremely light ping in town,
typically at transmission shift points. Easily gotten rid of
by moving up from 87 to 89 or just buying the 87 gas in Nevada
or Oregon rather than California.

Since the new ethanol blends have infested the local gas stations,
this no longer works. I get moderate ping under city traffic
conditions and it will only go away if I use 89 rather than
87. Haven't had a chance to try Nevada grade 87 yet.

 

Roughly 3/5/04 07:41, Kurt Dorsey's monkeys randomly typed:

>
> Thank you for the reply, When you say "blowing the carbon out" what do
> you mean? I am in Austin now, I did notice some places have 86. but I
> am pretty sure we have 87 here in town... Also, in CA they used
> Oxygenated fuel (if i remember right, they also have MTBE) and now
> that I am in Austin, i dont think any of those are in there...

Blowing the carbon out is generally done with an "Italian Tune-up"
named after old Alfa and similar engines that really did not like
being trundled around in town. Take the vehicle out of town and
floorboard it up thru the gears a few times.

 

Roughly 3/5/04 07:41, Kurt Dorsey's monkeys randomly typed:

>
> Thank you for the reply, When you say "blowing the carbon out" what do
> you mean? I am in Austin now, I did notice some places have 86. but I
> am pretty sure we have 87 here in town... Also, in CA they used
> Oxygenated fuel (if i remember right, they also have MTBE) and now
> that I am in Austin, i dont think any of those are in there...

Blowing the carbon out is generally done with an "Italian Tune-up"
named after old Alfa and similar engines that really did not like
being trundled around in town. Take the vehicle out of town and
floorboard it up thru the gears a few times.

 

Roughly 3/5/04 07:41, Kurt Dorsey's monkeys randomly typed:

>
> Thank you for the reply, When you say "blowing the carbon out" what do
> you mean? I am in Austin now, I did notice some places have 86. but I
> am pretty sure we have 87 here in town... Also, in CA they used
> Oxygenated fuel (if i remember right, they also have MTBE) and now
> that I am in Austin, i dont think any of those are in there...

Blowing the carbon out is generally done with an "Italian Tune-up"
named after old Alfa and similar engines that really did not like
being trundled around in town. Take the vehicle out of town and
floorboard it up thru the gears a few times.