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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