Re: Fuel economy - bad to worse
 

It has fuel injection with no distributor (uses three coils on the
rail). Total mileage done so far, 63k kms since new.

TW

Mike Romain wrote:
> Tune up time?
>
> Lots of folks forget about the distributor cap and rotor....
>
> Mike
> 86/00 CJ7 Laredo, 33x9.5 BFG Muds, 'glass nose to tail in '00
> 88 Cherokee 235 BFG AT's
> Canadian Off Road Trips Photos: Non members can still view!
> Jan/06 http://www.imagestation.com/album/pi...?id=2115147590
> (More Off Road album links at bottom of the view page)
>
> TW wrote:
>> Hi, my 01 TJ (4.0L Auto) seems to have lost whatever fuel economy it had
>> before. Lately, I can only do about 300kms on a full tank. I am
>> running 265/70R16s and an OME lift. These mods did not change the fuel
>> economy when they were done two years ago. Could it be that the O2
>> sensor has gone bad? There are no error codes or check light coming up.
>> Every thing else feels/runs fine. Any ideas?
>>
>> Thanks
>> TW

Re: Fuel economy - bad to worse
 

It has fuel injection with no distributor (uses three coils on the
rail). Total mileage done so far, 63k kms since new.

TW

Mike Romain wrote:
> Tune up time?
>
> Lots of folks forget about the distributor cap and rotor....
>
> Mike
> 86/00 CJ7 Laredo, 33x9.5 BFG Muds, 'glass nose to tail in '00
> 88 Cherokee 235 BFG AT's
> Canadian Off Road Trips Photos: Non members can still view!
> Jan/06 http://www.imagestation.com/album/pi...?id=2115147590
> (More Off Road album links at bottom of the view page)
>
> TW wrote:
>> Hi, my 01 TJ (4.0L Auto) seems to have lost whatever fuel economy it had
>> before. Lately, I can only do about 300kms on a full tank. I am
>> running 265/70R16s and an OME lift. These mods did not change the fuel
>> economy when they were done two years ago. Could it be that the O2
>> sensor has gone bad? There are no error codes or check light coming up.
>> Every thing else feels/runs fine. Any ideas?
>>
>> Thanks
>> TW

Re: Fuel economy - bad to worse
 

It has fuel injection with no distributor (uses three coils on the
rail). Total mileage done so far, 63k kms since new.

TW

Mike Romain wrote:
> Tune up time?
>
> Lots of folks forget about the distributor cap and rotor....
>
> Mike
> 86/00 CJ7 Laredo, 33x9.5 BFG Muds, 'glass nose to tail in '00
> 88 Cherokee 235 BFG AT's
> Canadian Off Road Trips Photos: Non members can still view!
> Jan/06 http://www.imagestation.com/album/pi...?id=2115147590
> (More Off Road album links at bottom of the view page)
>
> TW wrote:
>> Hi, my 01 TJ (4.0L Auto) seems to have lost whatever fuel economy it had
>> before. Lately, I can only do about 300kms on a full tank. I am
>> running 265/70R16s and an OME lift. These mods did not change the fuel
>> economy when they were done two years ago. Could it be that the O2
>> sensor has gone bad? There are no error codes or check light coming up.
>> Every thing else feels/runs fine. Any ideas?
>>
>> Thanks
>> TW

Re: Fuel economy - bad to worse
 

It could be that, I will try switching it to a different rating and
company and see if that makes any difference. NZ uses RON, where
regular is 91 and premium is 95. I use 91 from Shell, Mobil or BP.

Thanks
TW

Kate wrote:
> It could be the recent change in the fuel formulas.
> Don't know if you are running the same thing we are here in the states, but
> the new fuels decrease your mileage and sometimes as much as 5mpg like it
> did in our Liberty.
>
> Kate
>
> "TW" <REMOVE_attw@wave.co.nz> wrote in message
> news:e9a3i3$3rk$1@lust.ihug.co.nz...
> : Hi, my 01 TJ (4.0L Auto) seems to have lost whatever fuel economy it had
> : before. Lately, I can only do about 300kms on a full tank. I am
> : running 265/70R16s and an OME lift. These mods did not change the fuel
> : economy when they were done two years ago. Could it be that the O2
> : sensor has gone bad? There are no error codes or check light coming up.
> : Every thing else feels/runs fine. Any ideas?
> :
> : Thanks
> : TW
>
>

Re: Fuel economy - bad to worse
 

It could be that, I will try switching it to a different rating and
company and see if that makes any difference. NZ uses RON, where
regular is 91 and premium is 95. I use 91 from Shell, Mobil or BP.

Thanks
TW

Kate wrote:
> It could be the recent change in the fuel formulas.
> Don't know if you are running the same thing we are here in the states, but
> the new fuels decrease your mileage and sometimes as much as 5mpg like it
> did in our Liberty.
>
> Kate
>
> "TW" <REMOVE_attw@wave.co.nz> wrote in message
> news:e9a3i3$3rk$1@lust.ihug.co.nz...
> : Hi, my 01 TJ (4.0L Auto) seems to have lost whatever fuel economy it had
> : before. Lately, I can only do about 300kms on a full tank. I am
> : running 265/70R16s and an OME lift. These mods did not change the fuel
> : economy when they were done two years ago. Could it be that the O2
> : sensor has gone bad? There are no error codes or check light coming up.
> : Every thing else feels/runs fine. Any ideas?
> :
> : Thanks
> : TW
>
>

Re: Fuel economy - bad to worse
 

It could be that, I will try switching it to a different rating and
company and see if that makes any difference. NZ uses RON, where
regular is 91 and premium is 95. I use 91 from Shell, Mobil or BP.

Thanks
TW

Kate wrote:
> It could be the recent change in the fuel formulas.
> Don't know if you are running the same thing we are here in the states, but
> the new fuels decrease your mileage and sometimes as much as 5mpg like it
> did in our Liberty.
>
> Kate
>
> "TW" <REMOVE_attw@wave.co.nz> wrote in message
> news:e9a3i3$3rk$1@lust.ihug.co.nz...
> : Hi, my 01 TJ (4.0L Auto) seems to have lost whatever fuel economy it had
> : before. Lately, I can only do about 300kms on a full tank. I am
> : running 265/70R16s and an OME lift. These mods did not change the fuel
> : economy when they were done two years ago. Could it be that the O2
> : sensor has gone bad? There are no error codes or check light coming up.
> : Every thing else feels/runs fine. Any ideas?
> :
> : Thanks
> : TW
>
>

Re: Fuel economy - bad to worse
 

Well, I was never ---- with my record keeping. But I do know that I
used to get around 425 kms per gas tank, which is now down to around 300
kms. Do you think that could qualify as O2 sensor drift?

TW

DougW wrote:
>
> O2 sensor drift can cause lower milage. I have noticed that as well.
> The problem is the drift is so slight it's hard to tell without being
> ---- with the records.
>
> For example. :) http://www.revbeergoggles.com/gasminder/
>
> The pdf is just a chart of date/mpg and date/fuel cost.
>
> the ------sheet has all sorts of stuff in it. Need to update a few
> things.
>
>

Re: Fuel economy - bad to worse
 

Well, I was never ---- with my record keeping. But I do know that I
used to get around 425 kms per gas tank, which is now down to around 300
kms. Do you think that could qualify as O2 sensor drift?

TW

DougW wrote:
>
> O2 sensor drift can cause lower milage. I have noticed that as well.
> The problem is the drift is so slight it's hard to tell without being
> ---- with the records.
>
> For example. :) http://www.revbeergoggles.com/gasminder/
>
> The pdf is just a chart of date/mpg and date/fuel cost.
>
> the ------sheet has all sorts of stuff in it. Need to update a few
> things.
>
>

Re: Fuel economy - bad to worse
 

Well, I was never ---- with my record keeping. But I do know that I
used to get around 425 kms per gas tank, which is now down to around 300
kms. Do you think that could qualify as O2 sensor drift?

TW

DougW wrote:
>
> O2 sensor drift can cause lower milage. I have noticed that as well.
> The problem is the drift is so slight it's hard to tell without being
> ---- with the records.
>
> For example. :) http://www.revbeergoggles.com/gasminder/
>
> The pdf is just a chart of date/mpg and date/fuel cost.
>
> the ------sheet has all sorts of stuff in it. Need to update a few
> things.
>
>

Re: Fuel economy - bad to worse
 

We used to use RON here, .... before unleaded gasoline came out. The
typical values were 94-95 for regular and 100-105 for premium as I recall.

Nowadays we use (RON + MON) / 2 and typically have values of 87 for regular,
89 for mid-grade, and 91-93 for premium. (octane requirements vary with
altitude)

MON measures high speed knock and RON measures low speed knock and the
rating formula change was supposed to give a more accurate overall report.

However...... at the same time the rating formula changed people started
having drivability problems with the gasoline that the manufacturers claimed
had not been altered.

I think most people assumed that the new measurements was an attempt to hide
that for the first time gasoline quality was taking a step backwards..

"TW" <REMOVE_attw@wave.co.nz> wrote in message
news:e9c7sh$tlr$4@lust.ihug.co.nz...
> New Zealand uses RON Octane ratings, we have 91 (regular) and 95 premium.
> Owners manual says to use 91, which is what I use. Normally I go to
> Shell, Mobil or BP. At this stage, we don't use alcohol in our fuel. I
> will try to stick to one grade from one supplier and then switch and see
> if that makes any difference.
>
> TW
>
>
> L.W.(Bill) ------ III wrote:
>> I don't know what your octane ratings are in New Zealand, but as
>> our oil companies have had to take a lower grade of crude at seventy
>> seven bucks a forty four gallon barrel, the bounce to the ounce has
>> suffered. Also, here we have tried to save money by switching from a
>> major suppliers of gasoline to something with alcohol in it, knocking
>> off about twenty percent in economy and power. God Bless America, Bill
>> O|||||||O
>> mailto:-------------------- http://www.----------.com/
>>