Finally got around to installing the new regulator. Fuel economy @[EMAIL PROTECTED]
70 mph
is now around 24 mpg. You are correct, most of the issue was the O2
sensor.
Changing out the regulator helped to the tune of about 2 mpg.
Thanks for all of your help and suggestions.
Bill
"TonyJ" <"tonyjnospam at nospam visi.com"> wrote in message
news:13stv7kcltollac@[EMAIL PROTECTED]
> Good to hear its improving. The regulator might be an issue too but the
O2
> was probably most of the problem.
>
> Let us know the result.
>
> Bill Mote wrote:
>> Installed new O2 sensor and the situation improved. Checked the fuel
>> pressure and found at all times the pressure was greater than the
>> specification. Have new regulator on order.
>>
>> "Bill Mote" <bandjrest@[EMAIL PROTECTED]
> wrote in message
>> news:X3Ixj.678618$kj1.85387@[EMAIL PROTECTED]
>>
>>> Ordered the O2 sensor today, should be in tomorrow. Thanks for the
help.
>>> will keep you posted
>>> "TonyJ" <"tonyjnospam at nospam visi.com"> wrote in message
>>> news:13se3bn4kejehe5@[EMAIL PROTECTED]
>>>
>>>> I talked with a friend who has a lot of recent experience with these
>>>> and his thoughts are (in this order of importance):
>>>>
>>>> - O2 sensor is covered with carbon due to running rich. The only
reason
>>>> that the O2 would throw an error code is if its internal heating
>>>> element is bad.
>>>>
>>>> - Normal tune-up issues - Caps, rotors, wires and plugs
>>>>
>>>> - Log the fuel pressure over a low and high mileage cycle to find if
>>>> the fuel pressure regulator is on the way out.
>>>>
>>>> Me. I bet on the O2 sensor.
>>>>
>>>> Let us know what you find.
>>>>
>>>> Bill Mote wrote:
>>>>
>>>>> The return and supply line are in good condition with no signs of
>>>>> rust. The V8 has full electronic injection - Motronic. I will look
for
>>>>> the multifunction plug and check for corrosion. Engine temp both oil
>>>>> and water are right on normal. Other than the injection system
running
>>>>> full rich, all seems normal.
>>>>> "TonyJ" <"tonyjnospam at nospam visi.com"> wrote in message
>>>>> news:13sckfj12123515@[EMAIL PROTECTED]
>>>>>
>>>>>
>>>>>> The T44 series had a problem with leaks in the steel gas lines that
>>>>>> run under the car on the passenger side. The problem is that the
>>>>>> plastic clips that hold it to the underside of the car hold
moisture
>>>>>> and cause rust.
>>>>>>
>>>>>> If you smell fuel when walking by the right side of the car in a
>>>>>> closed area with no wind, that may be something to check.
>>>>>>
>>>>>> Does the V8 have CIS or fully electronic injection. I am more
>>>>>> familiar with the CIS from the I5s.
>>>>>>
>>>>>> I seem to remember that the V8 has an electronic multi-function
plug
>>>>>> somewhere on the top of the engine, possibly in the front. When
these
>>>>>> get wet or corroded they cause a number of problems.
>>>>>>
>>>>>> Is the engine temperature running at the normal level?
>>>>>>
>>>>>> Bill Mote wrote:
>>>>>>
>>>>>>
>>>>>>> I run Techron about every 10th tank or so. I should add that this
>>>>>>> issue occurred very suddenly, and is also intermittent. I can be
>>>>>>> driving at 70 mph show 12 - 14 mpg on the level and then suddenly
>>>>>>> the mileage jumps up to 21 -22 mpg. Overall average for the past
>>>>>>> 200 miles has been in the 11 - 12 mpg range, prior to that it was
>>>>>>> always in the 21 - 24 mpg avg. for freeway speeds.
>>>>>>> "TonyJ" <tonyj@[EMAIL PROTECTED]
> wrote in message
>>>>>>> news:13sbul2liecaqbd@[EMAIL PROTECTED]
>>>>>>>
>>>>>>>
>>>>>>>
>>>>>>>> Bill Mote wrote:
>>>>>>>>
>>>>>>>>
>>>>>>>>
>>>>>>>>> The fuel economy on my car has gone approximately in half. Went
>>>>>>>>> from around 22 mpg at 70 mph to around 10 to 11. I replaced the
>>>>>>>>> temp sensor, checked the mass air flow sensor, checked the idle
>>>>>>>>> speed motor? and have cleaned the throttle body. Also replaced
the
>>>>>>>>> air filter all to no avail. No codes in computer.
>>>>>>>>> What am I missing??
>>>>>>>>>
>>>>>>>>> Many thanks
>>>>>>>>> Bill
>>>>>>>>>
>>>>>>>>>
>>>>>>>>>
>>>>>>>>>
>>>>>>>>>
>>>>>>>>>
>>>>>>>> Winter fuel blends.
>>>>>>>>
>>>>>>>> May have dirty injectors with poor spray pattern. Try some
Techron
>>>>>>>> injector cleaner.
>>>>>>>>
>>>>>>>>
>>>>>>>
>>>>>
>>>>>
>>>
>>
>>
>>
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