Re: Grand Cherokee 2000 getting Extremely bad millage @ 14.5MPG from17.5MPG within 1 month.
 

if you are using the overhead console for this mileage figures please
note that only does a average and NOT a real life mileage figure
if you fill your tank start the jeep the overhead recalculates that, by
taking a reading off the fuel level sensor then it will take a few other
imputs including you pulling out of the gas station and flooring it it
looks at the tps speed senor and then recalculates the milage again then
dispalys the figure giving you the average milage not the real milage
and does it again after you shut it off and restart it
use the old style of figuing milage and not the overhead and if you have
bad milage then start looking elsewere

wilsonb wrote:

> The weirdest thing has happened recently.
> Grand Cherokee 2000 getting Extremely bad millage @ 14.5MPG from
> 17.5MPG within 1 month.
> Computer jumps back and fourth with MPG 19.5 then jump down to 13.5
> then back up to 14.5..
> and it's noticeably guzzling gas like crazy.
> (Has 1000,000miles)
> 4.7lt, 2wd, V8
>
> So far have;
> Replaced all Sparks with E3
> Cleaned Air filter
> Put good gas cleaner in tank a few times now.
> Use regular gas
> Have take to Chrysler Dealer and they have no clue.
> (Will call back tomorrow and ask why they didn't do a full Scan on it
> when I had a 'full' check done on it.)
> I checked the exhaust and there is a black grid out of it, maybe gas
> running to rich? Sensors off? Fuel filter?
>
> Any else have this or ideas?
>
> Thanks so much..

Re: Grand Cherokee 2000 getting Extremely bad millage @ 14.5MPG from17.5MPG within 1 month.
 

if you are using the overhead console for this mileage figures please
note that only does a average and NOT a real life mileage figure
if you fill your tank start the jeep the overhead recalculates that, by
taking a reading off the fuel level sensor then it will take a few other
imputs including you pulling out of the gas station and flooring it it
looks at the tps speed senor and then recalculates the milage again then
dispalys the figure giving you the average milage not the real milage
and does it again after you shut it off and restart it
use the old style of figuing milage and not the overhead and if you have
bad milage then start looking elsewere

wilsonb wrote:

> The weirdest thing has happened recently.
> Grand Cherokee 2000 getting Extremely bad millage @ 14.5MPG from
> 17.5MPG within 1 month.
> Computer jumps back and fourth with MPG 19.5 then jump down to 13.5
> then back up to 14.5..
> and it's noticeably guzzling gas like crazy.
> (Has 1000,000miles)
> 4.7lt, 2wd, V8
>
> So far have;
> Replaced all Sparks with E3
> Cleaned Air filter
> Put good gas cleaner in tank a few times now.
> Use regular gas
> Have take to Chrysler Dealer and they have no clue.
> (Will call back tomorrow and ask why they didn't do a full Scan on it
> when I had a 'full' check done on it.)
> I checked the exhaust and there is a black grid out of it, maybe gas
> running to rich? Sensors off? Fuel filter?
>
> Any else have this or ideas?
>
> Thanks so much..

Re: Grand Cherokee 2000 getting Extremely bad millage @ 14.5MPG from17.5MPG within 1 month.
 

if you are using the overhead console for this mileage figures please
note that only does a average and NOT a real life mileage figure
if you fill your tank start the jeep the overhead recalculates that, by
taking a reading off the fuel level sensor then it will take a few other
imputs including you pulling out of the gas station and flooring it it
looks at the tps speed senor and then recalculates the milage again then
dispalys the figure giving you the average milage not the real milage
and does it again after you shut it off and restart it
use the old style of figuing milage and not the overhead and if you have
bad milage then start looking elsewere

wilsonb wrote:

> The weirdest thing has happened recently.
> Grand Cherokee 2000 getting Extremely bad millage @ 14.5MPG from
> 17.5MPG within 1 month.
> Computer jumps back and fourth with MPG 19.5 then jump down to 13.5
> then back up to 14.5..
> and it's noticeably guzzling gas like crazy.
> (Has 1000,000miles)
> 4.7lt, 2wd, V8
>
> So far have;
> Replaced all Sparks with E3
> Cleaned Air filter
> Put good gas cleaner in tank a few times now.
> Use regular gas
> Have take to Chrysler Dealer and they have no clue.
> (Will call back tomorrow and ask why they didn't do a full Scan on it
> when I had a 'full' check done on it.)
> I checked the exhaust and there is a black grid out of it, maybe gas
> running to rich? Sensors off? Fuel filter?
>
> Any else have this or ideas?
>
> Thanks so much..

Re: Grand Cherokee 2000 getting Extremely bad millage @ 14.5MPG from 17.5MPG within 1 month.
 

ANY vehicle that has over 100,000 miles on it and the mileage drops suddenly, it is most likely the O2 sensors that need replacing. They are probably still working but not 100% correctly. They don't always should up as codes when a diagnostic is run either. You most likely have 2 of them, one before and one after the catalytic converter on your exhaust. Replace them both.
"philthy" <dbrider@cac.net> wrote in message news:46F56C4B.FAC3788A@cac.net...
if you are using the overhead console for this mileage figures please note that only does a average and NOT a real life mileage figure
if you fill your tank start the jeep the overhead recalculates that, by taking a reading off the fuel level sensor then it will take a few other imputs including you pulling out of the gas station and flooring it it looks at the tps speed senor and then recalculates the milage again then dispalys the figure giving you the average milage not the real milage
and does it again after you shut it off and restart it
use the old style of figuing milage and not the overhead and if you have bad milage then start looking elsewere
wilsonb wrote:

The weirdest thing has happened recently.
Grand Cherokee 2000 getting Extremely bad millage @ 14.5MPG from
17.5MPG within 1 month.
Computer jumps back and fourth with MPG 19.5 then jump down to 13.5
then back up to 14.5..
and it's noticeably guzzling gas like crazy.
(Has 1000,000miles)
4.7lt, 2wd, V8
So far have;
Replaced all Sparks with E3
Cleaned Air filter
Put good gas cleaner in tank a few times now.
Use regular gas
Have take to Chrysler Dealer and they have no clue.
(Will call back tomorrow and ask why they didn't do a full Scan on it
when I had a 'full' check done on it.)
I checked the exhaust and there is a black grid out of it, maybe gas
running to rich? Sensors off? Fuel filter?

Any else have this or ideas?

Thanks so much..

Re: Grand Cherokee 2000 getting Extremely bad millage @ 14.5MPG from 17.5MPG within 1 month.
 

ANY vehicle that has over 100,000 miles on it and the mileage drops suddenly, it is most likely the O2 sensors that need replacing. They are probably still working but not 100% correctly. They don't always should up as codes when a diagnostic is run either. You most likely have 2 of them, one before and one after the catalytic converter on your exhaust. Replace them both.
"philthy" <dbrider@cac.net> wrote in message news:46F56C4B.FAC3788A@cac.net...
if you are using the overhead console for this mileage figures please note that only does a average and NOT a real life mileage figure
if you fill your tank start the jeep the overhead recalculates that, by taking a reading off the fuel level sensor then it will take a few other imputs including you pulling out of the gas station and flooring it it looks at the tps speed senor and then recalculates the milage again then dispalys the figure giving you the average milage not the real milage
and does it again after you shut it off and restart it
use the old style of figuing milage and not the overhead and if you have bad milage then start looking elsewere
wilsonb wrote:

The weirdest thing has happened recently.
Grand Cherokee 2000 getting Extremely bad millage @ 14.5MPG from
17.5MPG within 1 month.
Computer jumps back and fourth with MPG 19.5 then jump down to 13.5
then back up to 14.5..
and it's noticeably guzzling gas like crazy.
(Has 1000,000miles)
4.7lt, 2wd, V8
So far have;
Replaced all Sparks with E3
Cleaned Air filter
Put good gas cleaner in tank a few times now.
Use regular gas
Have take to Chrysler Dealer and they have no clue.
(Will call back tomorrow and ask why they didn't do a full Scan on it
when I had a 'full' check done on it.)
I checked the exhaust and there is a black grid out of it, maybe gas
running to rich? Sensors off? Fuel filter?

Any else have this or ideas?

Thanks so much..

Re: Grand Cherokee 2000 getting Extremely bad millage @ 14.5MPG from 17.5MPG within 1 month.
 

ANY vehicle that has over 100,000 miles on it and the mileage drops suddenly, it is most likely the O2 sensors that need replacing. They are probably still working but not 100% correctly. They don't always should up as codes when a diagnostic is run either. You most likely have 2 of them, one before and one after the catalytic converter on your exhaust. Replace them both.
"philthy" <dbrider@cac.net> wrote in message news:46F56C4B.FAC3788A@cac.net...
if you are using the overhead console for this mileage figures please note that only does a average and NOT a real life mileage figure
if you fill your tank start the jeep the overhead recalculates that, by taking a reading off the fuel level sensor then it will take a few other imputs including you pulling out of the gas station and flooring it it looks at the tps speed senor and then recalculates the milage again then dispalys the figure giving you the average milage not the real milage
and does it again after you shut it off and restart it
use the old style of figuing milage and not the overhead and if you have bad milage then start looking elsewere
wilsonb wrote:

The weirdest thing has happened recently.
Grand Cherokee 2000 getting Extremely bad millage @ 14.5MPG from
17.5MPG within 1 month.
Computer jumps back and fourth with MPG 19.5 then jump down to 13.5
then back up to 14.5..
and it's noticeably guzzling gas like crazy.
(Has 1000,000miles)
4.7lt, 2wd, V8
So far have;
Replaced all Sparks with E3
Cleaned Air filter
Put good gas cleaner in tank a few times now.
Use regular gas
Have take to Chrysler Dealer and they have no clue.
(Will call back tomorrow and ask why they didn't do a full Scan on it
when I had a 'full' check done on it.)
I checked the exhaust and there is a black grid out of it, maybe gas
running to rich? Sensors off? Fuel filter?

Any else have this or ideas?

Thanks so much..

Re: Grand Cherokee 2000 getting Extremely bad millage @ 14.5MPG from 17.5MPG within 1 month.
 

ANY vehicle that has over 100,000 miles on it and the mileage drops suddenly, it is most likely the O2 sensors that need replacing. They are probably still working but not 100% correctly. They don't always should up as codes when a diagnostic is run either. You most likely have 2 of them, one before and one after the catalytic converter on your exhaust. Replace them both.
"philthy" <dbrider@cac.net> wrote in message news:46F56C4B.FAC3788A@cac.net...
if you are using the overhead console for this mileage figures please note that only does a average and NOT a real life mileage figure
if you fill your tank start the jeep the overhead recalculates that, by taking a reading off the fuel level sensor then it will take a few other imputs including you pulling out of the gas station and flooring it it looks at the tps speed senor and then recalculates the milage again then dispalys the figure giving you the average milage not the real milage
and does it again after you shut it off and restart it
use the old style of figuing milage and not the overhead and if you have bad milage then start looking elsewere
wilsonb wrote:

The weirdest thing has happened recently.
Grand Cherokee 2000 getting Extremely bad millage @ 14.5MPG from
17.5MPG within 1 month.
Computer jumps back and fourth with MPG 19.5 then jump down to 13.5
then back up to 14.5..
and it's noticeably guzzling gas like crazy.
(Has 1000,000miles)
4.7lt, 2wd, V8
So far have;
Replaced all Sparks with E3
Cleaned Air filter
Put good gas cleaner in tank a few times now.
Use regular gas
Have take to Chrysler Dealer and they have no clue.
(Will call back tomorrow and ask why they didn't do a full Scan on it
when I had a 'full' check done on it.)
I checked the exhaust and there is a black grid out of it, maybe gas
running to rich? Sensors off? Fuel filter?

Any else have this or ideas?

Thanks so much..

Re: Grand Cherokee 2000 getting Extremely bad millage @ 14.5MPG from17.5MPG within 1 month.
 

that jeep has some very close tolerences when it comes to 02 sensors and
operating parameters and it has 4 o2 sensors those sensor cost 100 each
at least and it' not a cheap throw at it part!gone are the days of100 k
sensors do you wrench at a dealer pete?

Peter wrote:

> ANY vehicle that has over 100,000 miles on it and the mileage drops
> suddenly, it is most likely the O2 sensors that need replacing. They
> are probably still working but not 100% correctly. They don't always
> should up as codes when a diagnostic is run either. You most likely
> have 2 of them, one before and one after the catalytic converter on
> your exhaust. Replace them both.
>
> "philthy" <dbrider@cac.net> wrote in message
> news:46F56C4B.FAC3788A@cac.net...if you are using the
> overhead console for this mileage figures please note that
> only does a average and NOT a real life mileage figure
> if you fill your tank start the jeep the overhead
> recalculates that, by taking a reading off the fuel level
> sensor then it will take a few other imputs including you
> pulling out of the gas station and flooring it it looks at
> the tps speed senor and then recalculates the milage again
> then dispalys the figure giving you the average milage not
> the real milage
> and does it again after you shut it off and restart it
> use the old style of figuing milage and not the overhead and
> if you have bad milage then start looking elsewere
> wilsonb wrote:
>
> > The weirdest thing has happened recently.
> > Grand Cherokee 2000 getting Extremely bad millage @
> > 14.5MPG from
> > 17.5MPG within 1 month.
> > Computer jumps back and fourth with MPG 19.5 then jump
> > down to 13.5
> > then back up to 14.5..
> > and it's noticeably guzzling gas like crazy.
> > (Has 1000,000miles)
> > 4.7lt, 2wd, V8
> >
> > So far have;
> > Replaced all Sparks with E3
> > Cleaned Air filter
> > Put good gas cleaner in tank a few times now.
> > Use regular gas
> > Have take to Chrysler Dealer and they have no clue.
> > (Will call back tomorrow and ask why they didn't do a full
> > Scan on it
> > when I had a 'full' check done on it.)
> > I checked the exhaust and there is a black grid out of it,
> > maybe gas
> > running to rich? Sensors off? Fuel filter?
> >
> > Any else have this or ideas?
> >
> > Thanks so much..
>

Re: Grand Cherokee 2000 getting Extremely bad millage @ 14.5MPG from17.5MPG within 1 month.
 

that jeep has some very close tolerences when it comes to 02 sensors and
operating parameters and it has 4 o2 sensors those sensor cost 100 each
at least and it' not a cheap throw at it part!gone are the days of100 k
sensors do you wrench at a dealer pete?

Peter wrote:

> ANY vehicle that has over 100,000 miles on it and the mileage drops
> suddenly, it is most likely the O2 sensors that need replacing. They
> are probably still working but not 100% correctly. They don't always
> should up as codes when a diagnostic is run either. You most likely
> have 2 of them, one before and one after the catalytic converter on
> your exhaust. Replace them both.
>
> "philthy" <dbrider@cac.net> wrote in message
> news:46F56C4B.FAC3788A@cac.net...if you are using the
> overhead console for this mileage figures please note that
> only does a average and NOT a real life mileage figure
> if you fill your tank start the jeep the overhead
> recalculates that, by taking a reading off the fuel level
> sensor then it will take a few other imputs including you
> pulling out of the gas station and flooring it it looks at
> the tps speed senor and then recalculates the milage again
> then dispalys the figure giving you the average milage not
> the real milage
> and does it again after you shut it off and restart it
> use the old style of figuing milage and not the overhead and
> if you have bad milage then start looking elsewere
> wilsonb wrote:
>
> > The weirdest thing has happened recently.
> > Grand Cherokee 2000 getting Extremely bad millage @
> > 14.5MPG from
> > 17.5MPG within 1 month.
> > Computer jumps back and fourth with MPG 19.5 then jump
> > down to 13.5
> > then back up to 14.5..
> > and it's noticeably guzzling gas like crazy.
> > (Has 1000,000miles)
> > 4.7lt, 2wd, V8
> >
> > So far have;
> > Replaced all Sparks with E3
> > Cleaned Air filter
> > Put good gas cleaner in tank a few times now.
> > Use regular gas
> > Have take to Chrysler Dealer and they have no clue.
> > (Will call back tomorrow and ask why they didn't do a full
> > Scan on it
> > when I had a 'full' check done on it.)
> > I checked the exhaust and there is a black grid out of it,
> > maybe gas
> > running to rich? Sensors off? Fuel filter?
> >
> > Any else have this or ideas?
> >
> > Thanks so much..
>

Re: Grand Cherokee 2000 getting Extremely bad millage @ 14.5MPG from17.5MPG within 1 month.
 

that jeep has some very close tolerences when it comes to 02 sensors and
operating parameters and it has 4 o2 sensors those sensor cost 100 each
at least and it' not a cheap throw at it part!gone are the days of100 k
sensors do you wrench at a dealer pete?

Peter wrote:

> ANY vehicle that has over 100,000 miles on it and the mileage drops
> suddenly, it is most likely the O2 sensors that need replacing. They
> are probably still working but not 100% correctly. They don't always
> should up as codes when a diagnostic is run either. You most likely
> have 2 of them, one before and one after the catalytic converter on
> your exhaust. Replace them both.
>
> "philthy" <dbrider@cac.net> wrote in message
> news:46F56C4B.FAC3788A@cac.net...if you are using the
> overhead console for this mileage figures please note that
> only does a average and NOT a real life mileage figure
> if you fill your tank start the jeep the overhead
> recalculates that, by taking a reading off the fuel level
> sensor then it will take a few other imputs including you
> pulling out of the gas station and flooring it it looks at
> the tps speed senor and then recalculates the milage again
> then dispalys the figure giving you the average milage not
> the real milage
> and does it again after you shut it off and restart it
> use the old style of figuing milage and not the overhead and
> if you have bad milage then start looking elsewere
> wilsonb wrote:
>
> > The weirdest thing has happened recently.
> > Grand Cherokee 2000 getting Extremely bad millage @
> > 14.5MPG from
> > 17.5MPG within 1 month.
> > Computer jumps back and fourth with MPG 19.5 then jump
> > down to 13.5
> > then back up to 14.5..
> > and it's noticeably guzzling gas like crazy.
> > (Has 1000,000miles)
> > 4.7lt, 2wd, V8
> >
> > So far have;
> > Replaced all Sparks with E3
> > Cleaned Air filter
> > Put good gas cleaner in tank a few times now.
> > Use regular gas
> > Have take to Chrysler Dealer and they have no clue.
> > (Will call back tomorrow and ask why they didn't do a full
> > Scan on it
> > when I had a 'full' check done on it.)
> > I checked the exhaust and there is a black grid out of it,
> > maybe gas
> > running to rich? Sensors off? Fuel filter?
> >
> > Any else have this or ideas?
> >
> > Thanks so much..
>