96 GC hesitation, rough running...

96, 2wd, auto, I-6

had a 171 code (lean), followed by 172 (rich) this means O2 sensors, eh?
do I get new bosch ones, now I get a 138 code, meaning "O2 Sensor Circuit
High Voltage (Bank 1 Sensor 2)
Oxygen sensor input voltage maintained above normal operating range. so, the
cat. sensorvolt. is too high.



the trouble with the vehicle is that it runs rough, and has severe
hesitation. the intke is clean, has new TPS sensor.

here's the rub... this only happens when ambient temp is above 85F. early
mornings, late nights, below 85, runs just fine... what am i missing, and
what about the 138 code?

thanks

One of the causes could be the fuel pump giving up:
http://www.wjjeeps.com/faultcodes.htm
God Bless America, ßill O|||||||O
http://www.billhughes.com/

nunya wrote:
>
> 96, 2wd, auto, I-6
>
> had a 171 code (lean), followed by 172 (rich) this means O2 sensors, eh?
> do I get new bosch ones, now I get a 138 code, meaning "O2 Sensor Circuit
> High Voltage (Bank 1 Sensor 2)
> Oxygen sensor input voltage maintained above normal operating range. so, the
> cat. sensorvolt. is too high.
>
> the trouble with the vehicle is that it runs rough, and has severe
> hesitation. the intke is clean, has new TPS sensor.
>
> here's the rub... this only happens when ambient temp is above 85F. early
> mornings, late nights, below 85, runs just fine... what am i missing, and
> what about the 138 code?
>
> thanks

Oh, say it ain't so, Bill... please?

"L.W. ("ßill") Hughes III" > wrote in message
...
> One of the causes could be the fuel pump giving up:
> http://www.wjjeeps.com/faultcodes.htm
> God Bless America, ßill O|||||||O
> http://www.billhughes.com/
>
> nunya wrote:
>>
>> 96, 2wd, auto, I-6
>>
>> had a 171 code (lean), followed by 172 (rich) this means O2 sensors, eh?
>> do I get new bosch ones, now I get a 138 code, meaning "O2 Sensor Circuit
>> High Voltage (Bank 1 Sensor 2)
>> Oxygen sensor input voltage maintained above normal operating range. so,
>> the
>> cat. sensorvolt. is too high.
>>
>> the trouble with the vehicle is that it runs rough, and has severe
>> hesitation. the intke is clean, has new TPS sensor.
>>
>> here's the rub... this only happens when ambient temp is above 85F. early
>> mornings, late nights, below 85, runs just fine... what am i missing, and
>> what about the 138 code?
>>
>> thanks

whas the cause of the 138 code? brand new bosch...

"L.W. ("ßill") Hughes III" > wrote in message
...
> One of the causes could be the fuel pump giving up:
> http://www.wjjeeps.com/faultcodes.htm
> God Bless America, ßill O|||||||O
> http://www.billhughes.com/
>
> nunya wrote:
>>
>> 96, 2wd, auto, I-6
>>
>> had a 171 code (lean), followed by 172 (rich) this means O2 sensors, eh?
>> do I get new bosch ones, now I get a 138 code, meaning "O2 Sensor Circuit
>> High Voltage (Bank 1 Sensor 2)
>> Oxygen sensor input voltage maintained above normal operating range. so,
>> the
>> cat. sensorvolt. is too high.
>>
>> the trouble with the vehicle is that it runs rough, and has severe
>> hesitation. the intke is clean, has new TPS sensor.
>>
>> here's the rub... this only happens when ambient temp is above 85F. early
>> mornings, late nights, below 85, runs just fine... what am i missing, and
>> what about the 138 code?
>>
>> thanks

"nunya" > wrote in message
...
> whas the cause of the 138 code? brand new bosch...

P0138-1/2 O2 SENSOR SHORTED TO VOLTAGE

When Monitored: With battery voltage greater than 10.4 volts, engine running
for more

than 4 minutes and coolant temperature above 180°F.

Set Condition: The oxygen sensor voltage is above 1.5 volts



>
> "L.W. ("ßill") Hughes III" > wrote in message
> ...
>> One of the causes could be the fuel pump giving up:
>> http://www.wjjeeps.com/faultcodes.htm
>> God Bless America, ßill O|||||||O
>> http://www.billhughes.com/
>>
>> nunya wrote:
>>>
>>> 96, 2wd, auto, I-6
>>>
>>> had a 171 code (lean), followed by 172 (rich) this means O2 sensors, eh?
>>> do I get new bosch ones, now I get a 138 code, meaning "O2 Sensor
>>> Circuit
>>> High Voltage (Bank 1 Sensor 2)
>>> Oxygen sensor input voltage maintained above normal operating range. so,
>>> the
>>> cat. sensorvolt. is too high.
>>>
>>> the trouble with the vehicle is that it runs rough, and has severe
>>> hesitation. the intke is clean, has new TPS sensor.
>>>
>>> here's the rub... this only happens when ambient temp is above 85F.
>>> early
>>> mornings, late nights, below 85, runs just fine... what am i missing,
>>> and
>>> what about the 138 code?
>>>
>>> thanks
>
>

ok... remedy?

"Mike" > wrote in message
...
>
> "nunya" > wrote in message
> ...
>> whas the cause of the 138 code? brand new bosch...
>
> P0138-1/2 O2 SENSOR SHORTED TO VOLTAGE
>
> When Monitored: With battery voltage greater than 10.4 volts, engine
> running for more
>
> than 4 minutes and coolant temperature above 180°F.
>
> Set Condition: The oxygen sensor voltage is above 1.5 volts
>
>
>
>>
>> "L.W. ("ßill") Hughes III" > wrote in message
>> ...
>>> One of the causes could be the fuel pump giving up:
>>> http://www.wjjeeps.com/faultcodes.htm
>>> God Bless America, ßill O|||||||O
>>> http://www.billhughes.com/
>>>
>>> nunya wrote:
>>>>
>>>> 96, 2wd, auto, I-6
>>>>
>>>> had a 171 code (lean), followed by 172 (rich) this means O2 sensors,
>>>> eh?
>>>> do I get new bosch ones, now I get a 138 code, meaning "O2 Sensor
>>>> Circuit
>>>> High Voltage (Bank 1 Sensor 2)
>>>> Oxygen sensor input voltage maintained above normal operating range.
>>>> so, the
>>>> cat. sensorvolt. is too high.
>>>>
>>>> the trouble with the vehicle is that it runs rough, and has severe
>>>> hesitation. the intke is clean, has new TPS sensor.
>>>>
>>>> here's the rub... this only happens when ambient temp is above 85F.
>>>> early
>>>> mornings, late nights, below 85, runs just fine... what am i missing,
>>>> and
>>>> what about the 138 code?
>>>>
>>>> thanks
>>
>>
>
>

Once again Bill, You have been confirmed as Master of all he surveys.
It was indeed the fuel pump.
Thanks.

"L.W. ("ßill") Hughes III" > wrote in message
...
> One of the causes could be the fuel pump giving up:
> http://www.wjjeeps.com/faultcodes.htm
> God Bless America, ßill O|||||||O
> http://www.billhughes.com/
>
> nunya wrote:
>>
>> 96, 2wd, auto, I-6
>>
>> had a 171 code (lean), followed by 172 (rich) this means O2 sensors, eh?
>> do I get new bosch ones, now I get a 138 code, meaning "O2 Sensor Circuit
>> High Voltage (Bank 1 Sensor 2)
>> Oxygen sensor input voltage maintained above normal operating range. so,
>> the
>> cat. sensorvolt. is too high.
>>
>> the trouble with the vehicle is that it runs rough, and has severe
>> hesitation. the intke is clean, has new TPS sensor.
>>
>> here's the rub... this only happens when ambient temp is above 85F. early
>> mornings, late nights, below 85, runs just fine... what am i missing, and
>> what about the 138 code?
>>
>> thanks