I know that and I agree with your observation of shop manuals. I build a
lot
of motors and now have to use a 4 gas analyzer to tune, as there are no
visible indicators anymore on the plugs. You only see ash now with racing
fuel.
Steve
"Simpson" <"tinauxide butylflex"@[EMAIL PROTECTED]
> wrote in message
news:X0bGj.30157$R84.19579@[EMAIL PROTECTED]
> Steve Lusardi wrote:
>> Unless you are using leaded gasoline or burning lube oil there is no
>> color change, as there is no more ash. The lead in gas created lead
>> bromide ash which lubricated the valves and valve seats. That ash
>> appeared as a light tan deposit on the plugs. Eroded electrodes and
>> anodes indicates over heated plugs, so if you are using the correct
heat
>> range, no or very low erosion will occur. So, the answer to your
question
>> is, yes, you can have a bad plug due to ceramic cracking, carbon
tracking
>> or resister failure and have it not be visible.
>> Steve
>
> That's interesting about the tan coloring no longer being an indicator
of
> a healthy engine and a correct air fuel mixture. Someone needs to tell
the
> writers of shop manuals. Leaded fuel began being phased out in the US in
> 1973 and have been totally banned for on-road vehicles for 12 years now.
>
>>
>> "Simpson" <"tinauxide butylflex"@[EMAIL PROTECTED]
> wrote in message
>> news:AUgFj.35283$J41.27952@[EMAIL PROTECTED]
>>> I pose this question in my ongoing quest to improve performance on my
87
>>> Dakota without spending unnecessarily.
>>>
>>> Actually, it's not the spending that bothers me. I just don't feel
like
>>> changing my plugs. Condemn me for a lazy good-for-nothing if you will,
>>> but that's just the way it is today.
>>>
>>> The reason I know that they look healthy is that every once in a while
I
>>> pull one to see how it's doing.
>>>
>>> Hello, plug
>>> How ya doin'?
>>> I come to watch your changing huin'
>>>
>>> (huin' - slangy contraction of 'hueing', from 'hue', a gradation or
>>> variety of a color; tint)
>>>
>>> The plugs have nice, unworn, square electrodes and are properly gapped
>>> and, over all, have a nice healthy appearance, albeit the ceramic
>>> insulators are a bit on the white side. Can I assume that they are in
>>> good shape? Or is there some internal condition, unseen by mortal eye,
>>> that can develop, that causes plug performance to deteriorate?
>>>
>>> The truck idles a bit rough, nothing at all severe, but something that
I
>>> think could be improved. I am ruling out the fuel delivery for the
>>> moment and concentrating on the ignition. The cap and rotor appear to
be
>>> in good condition. The ignition wires all measure a bit below the low
>>> end of the resistance range as specified in the service manual, 250 to
>>> 600 ohms per inch. Mine are about 200 to 220 ohms per inch and are not
>>> that old.
>>
>>
>
>
> --
>
> Chuck Norris can fool all of the people all of the time and Chuck Norris
> sup****ts McCain.
>
> McCain -- it rhymes with Hussein, Bahrain, cocaine, insane, wolfbane,
> chest pain and chow mein.
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