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

 

Tire pressure, air filter, spark plugs, dragging brakes, diff lube, ATF...to
start..


"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

 

Tire pressure, air filter, spark plugs, dragging brakes, diff lube, ATF...to
start..


"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

 

Tire pressure, air filter, spark plugs, dragging brakes, diff lube, ATF...to
start..


"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

 

Billy,

Tyre pressure checked every week (running at 30psi), air filter replaced
Dec '05, spark plugs replace d Dec '04, front brake pads replaced two
weeks ago, diff oil changed Dec '05, ATF changed Dec '05. Any other ideas?

Thanks
TW

billy ray wrote:

> Tire pressure, air filter, spark plugs, dragging brakes, diff lube, ATF...to
> start..
>
>
> "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
>
>

 

Billy,

Tyre pressure checked every week (running at 30psi), air filter replaced
Dec '05, spark plugs replace d Dec '04, front brake pads replaced two
weeks ago, diff oil changed Dec '05, ATF changed Dec '05. Any other ideas?

Thanks
TW

billy ray wrote:

> Tire pressure, air filter, spark plugs, dragging brakes, diff lube, ATF...to
> start..
>
>
> "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
>
>

 

Billy,

Tyre pressure checked every week (running at 30psi), air filter replaced
Dec '05, spark plugs replace d Dec '04, front brake pads replaced two
weeks ago, diff oil changed Dec '05, ATF changed Dec '05. Any other ideas?

Thanks
TW

billy ray wrote:

> Tire pressure, air filter, spark plugs, dragging brakes, diff lube, ATF...to
> start..
>
>
> "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
>
>

 

Your new brakes aren't dragging are they?

What about the parking brake? some times the cables seize...

Check the plugs... although if they were mis firing regularly you would get
a p030x code..

Pull off the intake resonator and take a look at your throttle body, It
might need a cleaning with spray cleaner and an old toothbrush.

http://www.imagestation.com/album/?id=2122181169

The injectors might be a bit sticky, a can of Seafoam or Techron in the
gasoline might help

Be careful if you go to buy Techron. They make Techron Cleaner (pure stuff)
and Cleaner with Techron (diluted stuff), you want the pure stuff. Both
retail about $6-$7 (us) per bottle

You don't let your wife or teenage daughter drive it do you?

Do you have neighborhood youths who might be siphoning it out?

What about a gas tank or gas line leak?

Have you changes *brands* or octane of gasoline? It can make a difference.

The last thing that comes to mind at the moment (it is 3:30 AM here) is
driving style....... has that changed? It can alter your mileage 30-40% per
recent tests.



"TW" <REMOVE_attw@wave.co.nz> wrote in message
news:e9a4ms$5v6$1@lust.ihug.co.nz...
> Billy,
>
> Tyre pressure checked every week (running at 30psi), air filter replaced
> Dec '05, spark plugs replace d Dec '04, front brake pads replaced two
> weeks ago, diff oil changed Dec '05, ATF changed Dec '05. Any other
> ideas?
>
> Thanks
> TW
>
> billy ray wrote:
>
>> Tire pressure, air filter, spark plugs, dragging brakes, diff lube,
>> ATF...to start..
>>
>>
>> "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
>>

 

Your new brakes aren't dragging are they?

What about the parking brake? some times the cables seize...

Check the plugs... although if they were mis firing regularly you would get
a p030x code..

Pull off the intake resonator and take a look at your throttle body, It
might need a cleaning with spray cleaner and an old toothbrush.

http://www.imagestation.com/album/?id=2122181169

The injectors might be a bit sticky, a can of Seafoam or Techron in the
gasoline might help

Be careful if you go to buy Techron. They make Techron Cleaner (pure stuff)
and Cleaner with Techron (diluted stuff), you want the pure stuff. Both
retail about $6-$7 (us) per bottle

You don't let your wife or teenage daughter drive it do you?

Do you have neighborhood youths who might be siphoning it out?

What about a gas tank or gas line leak?

Have you changes *brands* or octane of gasoline? It can make a difference.

The last thing that comes to mind at the moment (it is 3:30 AM here) is
driving style....... has that changed? It can alter your mileage 30-40% per
recent tests.



"TW" <REMOVE_attw@wave.co.nz> wrote in message
news:e9a4ms$5v6$1@lust.ihug.co.nz...
> Billy,
>
> Tyre pressure checked every week (running at 30psi), air filter replaced
> Dec '05, spark plugs replace d Dec '04, front brake pads replaced two
> weeks ago, diff oil changed Dec '05, ATF changed Dec '05. Any other
> ideas?
>
> Thanks
> TW
>
> billy ray wrote:
>
>> Tire pressure, air filter, spark plugs, dragging brakes, diff lube,
>> ATF...to start..
>>
>>
>> "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
>>

 

Your new brakes aren't dragging are they?

What about the parking brake? some times the cables seize...

Check the plugs... although if they were mis firing regularly you would get
a p030x code..

Pull off the intake resonator and take a look at your throttle body, It
might need a cleaning with spray cleaner and an old toothbrush.

http://www.imagestation.com/album/?id=2122181169

The injectors might be a bit sticky, a can of Seafoam or Techron in the
gasoline might help

Be careful if you go to buy Techron. They make Techron Cleaner (pure stuff)
and Cleaner with Techron (diluted stuff), you want the pure stuff. Both
retail about $6-$7 (us) per bottle

You don't let your wife or teenage daughter drive it do you?

Do you have neighborhood youths who might be siphoning it out?

What about a gas tank or gas line leak?

Have you changes *brands* or octane of gasoline? It can make a difference.

The last thing that comes to mind at the moment (it is 3:30 AM here) is
driving style....... has that changed? It can alter your mileage 30-40% per
recent tests.



"TW" <REMOVE_attw@wave.co.nz> wrote in message
news:e9a4ms$5v6$1@lust.ihug.co.nz...
> Billy,
>
> Tyre pressure checked every week (running at 30psi), air filter replaced
> Dec '05, spark plugs replace d Dec '04, front brake pads replaced two
> weeks ago, diff oil changed Dec '05, ATF changed Dec '05. Any other
> ideas?
>
> Thanks
> TW
>
> billy ray wrote:
>
>> Tire pressure, air filter, spark plugs, dragging brakes, diff lube,
>> ATF...to start..
>>
>>
>> "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
>>