One thing to remember is that almost always when there is a "O2" sensor
code, that means that the sensor is working just fine, it is telling you
that there is something wrong upstream.
In talking with several good SHO techs, and other mechanics, they say
that )2 sensors rarely go bad, and when they do you will know it.
Otherwise, they do their job telling you that something is wrong
upstream, a misfire, a leaking injector etc.
The fuel smell could be from those things instead of the 02 sensor.
Most people and a lot of mechanics change out the 02 sensors only to
find the problem was somewhere else.
Don Mallinson
Steven W. Riggins wrote:
> So if my O2 sensors are going bad, that would make it run too rich
> and cause some of the rich fuel odor I smell from time to time?
>
> On Jul 5, 2006, at 3:15 PM, Paul Nimz wrote:
>
>> There is no learning for the octane. The knock sensors fire off
>> when they
>> hear noise and the timing is immediately retarded. The new timing
>> numbers
>> will automatically be adjusted no matter what or when. Assuming you
>> knock
>> sensors and the code strategy is up to it.
>>
>> Now the less btu content of the higher octane will have a small
>> change on the
>> learned tables by requiring a slightly richer mixture when in closed
>> loop.
>> But the O2s will adjust to the proper 14.6 AF ratio then start
>> saving new
>> values to the adaptive tables immediately.
>>
>> But the WOT tables are fixed and therefore without adjustment you
>> get what you
>> get. Stock tables are way rich anyway for open loop (on the V8).
>>
>> I've always gotten a bit better mileage from premium, ~1-2 mpg, but
>> cost wise
>> it's a draw.
>>
>> I do see an advantage to using premium when the ambient temp is
>> above 80F as
>> the timing will stay higher.
>>
>> Paul
>>
>>
>> On 7/5/2006 12:21:12 PM, Juillerat, Aaron J (aaronj@autojectors.com)
>> wrote:
>>
>>> Drive like you normally would that is best. The computer will
>>> adjust to
>>> the optimum performance of the parameters
>>> it's faced with. Meaning your
>>> car was use to how you drive with premium, then all the sudden you
>>> dropped to regular and thus changing a parameter so it needs to learn
>>> what to do with the lower octane. You may even want to pull a battery
>>> cable off and clear the computer and let it start from scratch.
>>>
>>> -A.J.
>>>
>>> -----Original Message-----
>>> From: shotimes-admin@autox.team.net
>>> [mailto:shotimes-admin@autox.team.net]
>>> Sent: Wednesday, July 05, 2006 1:05 PM
>>> To: shotimes@autox.team.net
>>> Subject: Re: [Shotimes] Poor mileage
>>>
>>> Is that for the first few tanks, or do I always need to floor it?
>>> I'm
>>> usually easier on the gas than not.
>>>
>>> On Jul 5, 2006, at 9:35 AM, Rick Glass wrote:
>>>
>>>> It will improve after a couple of tanks, the computer adjusts for
>>>> stuff like that......just give it more than 1 tank and
>>>
>>> don't be
>>>
>>>> afraid to put your foot in it, if you don't get on it, it
>>>
>>> ain't
>>>
>>>> gonna run right.
>>>>
>>>>
>>>>
>>>> Rick Glass
>>>> '99 SF 98k
>>>
>>> Flowmasters
>>> Kirk'd
>>
>> _______________________________________________
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>> Shotimes@autox.team.net
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>
> _______________________________________________
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