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Distributor cap shorting out.
On 9/28/2022 3:24 PM, Michael Salter wrote:
>
> **
>
> This problem has plagued me for over 1000 miles.
>
> Today I had to drive some 200 miles and this is how it went:
>
> Starting from cold I experienced a persistent and irregular misfire.
>
> Pulling the choke out made no perceivable difference.
>
> Power was not much affected and the car cruised along well in top
> overdrive with just regular periods of misfiring.
>
> Climbing slopes really made no difference, even when full throttle was
> applied for 10 - 15 seconds.
>
> Misfire continued for some 90 miles with no change when the engine was
> fully heated up.
>
> I could really do nothing to influence the rate of the misfire
> although it did seem to be slightly less evident at low throttle settings.
>
> After 90 miles I stopped briefly to get fuel and upon starting off it
> was quite evident that the misfire had disappeared almost completely
> and remained that way for at least 80 miles after which it started to
> misfire just a little as I came to the end of the trip.
>
> _POSSIBLE CAUSES_
>
> 1.Plugs â?¦ not like a bad plug. The misfire seems to be more than 1
> cylinder and never came close to being the regular beat that 1 plug
> misfiring produces. All the plugs have a healthy brown/ grey appearance.
>
> 2.Coil â?¦In my experience coils are very reliable but when they do fail
> they tend to fail as they warm up and the problem gets worse as the
> coil warms up
>
> 3.Points â?¦ a possibility but the dwell is set at exactly 60 degrees
> and does not waver at all when the engine is running in the shop.
>
> 4.Fuel pump â?¦ if the engine was starving for fuel because of a fuel
> supply issue caused by a blockage or failing pump the problem would
> get worse when the demand for fuel increased, as in climbing a hill of
> full throttle. This was absolutely not the case.
>
>
> Any ideas folks?
>
>
>
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Distributor cap shorting out.<br>
<br>
<br>
<div class="moz-cite-prefix">On 9/28/2022 3:24 PM, Michael Salter
wrote:<br>
</div>
<blockquote type="cite"
cite="mid:CAB3i7LJ7O3Z58YEjEbdVVdpz7Q_9ovaggKrJBXLiwLQ2ksnPrQ@mail.gmail.com">
<meta http-equiv="content-type" content="text/html; charset=UTF-8">
<div dir="ltr">
<div class="gmail_default"
style="font-family:arial,sans-serif;font-size:small">
<p class="MsoNormal" style="text-align:center;margin:0in 0in
8pt;line-height:107%;font-size:11pt;font-family:"Calibri",sans-serif"
align="center"><b><span
style="font-size:18pt;line-height:107%"><span></span></span></b></p>
<p class="MsoNormal" style="margin:0in 0in
8pt;line-height:107%;font-size:11pt;font-family:"Calibri",sans-serif">This
problem has plagued me for over 1000 miles.<span></span></p>
<p class="MsoNormal" style="margin:0in 0in
8pt;line-height:107%;font-size:11pt;font-family:"Calibri",sans-serif">Today
I had to drive some 200 miles and this is how it
went:<span></span></p>
<p class="MsoNormal" style="margin:0in 0in
8pt;line-height:107%;font-size:11pt;font-family:"Calibri",sans-serif">Starting
from cold I experienced a persistent and irregular misfire.
<span></span></p>
<p class="MsoNormal" style="margin:0in 0in
8pt;line-height:107%;font-size:11pt;font-family:"Calibri",sans-serif">Pulling
the choke out made no perceivable difference.<span></span></p>
<p class="MsoNormal" style="margin:0in 0in
8pt;line-height:107%;font-size:11pt;font-family:"Calibri",sans-serif">Power
was not much affected and the car cruised along well
in top overdrive with just regular periods of
misfiring.<span></span></p>
<p class="MsoNormal" style="margin:0in 0in
8pt;line-height:107%;font-size:11pt;font-family:"Calibri",sans-serif">Climbing
slopes really made no difference, even when full
throttle was applied for 10 - 15 seconds.<span></span></p>
<p class="MsoNormal" style="margin:0in 0in
8pt;line-height:107%;font-size:11pt;font-family:"Calibri",sans-serif">Misfire
continued for some 90 miles with no change when the
engine was fully heated up.<span></span></p>
<p class="MsoNormal" style="margin:0in 0in
8pt;line-height:107%;font-size:11pt;font-family:"Calibri",sans-serif">I
could really do nothing to influence the rate of the
misfire although it did seem to be slightly less evident at
low throttle
settings.<span></span></p>
<p class="MsoNormal" style="margin:0in 0in
8pt;line-height:107%;font-size:11pt;font-family:"Calibri",sans-serif">After
90 miles I stopped briefly to get fuel and upon
starting off it was quite evident that the misfire had
disappeared almost completely
and remained that way for at least 80 miles after which it
started to misfire
just a little as I came to the end of the trip.<span></span></p>
<p class="MsoNormal" style="margin:0in 0in
8pt;line-height:107%;font-size:11pt;font-family:"Calibri",sans-serif"><u><span>Â </span>POSSIBLE
CAUSES</u><span></span></p>
<p class="gmail-MsoListParagraphCxSpFirst" style="margin:0in
0in 0in
0.5in;line-height:107%;font-size:11pt;font-family:"Calibri",sans-serif"><span><span>1.<span
style="font:7pt "Times New Roman"">Â Â Â Â Â
</span></span></span>Plugs â?¦ not like a bad plug. The
misfire seems
to be more than 1 cylinder and never came close to being the
regular beat that 1
plug misfiring produces. All the plugs have a healthy brown/
grey appearance.<span></span></p>
<p class="gmail-MsoListParagraphCxSpMiddle" style="margin:0in
0in 0in
0.5in;line-height:107%;font-size:11pt;font-family:"Calibri",sans-serif"><span><span>2.<span
style="font:7pt "Times New Roman"">Â Â Â Â Â
</span></span></span>Coil â?¦<span>Â </span>In
my experience coils are very reliable but when they do fail
they tend to fail
as they warm up and the problem gets worse as the coil warms
up<span></span></p>
<p class="gmail-MsoListParagraphCxSpMiddle" style="margin:0in
0in 0in
0.5in;line-height:107%;font-size:11pt;font-family:"Calibri",sans-serif"><span><span>3.<span
style="font:7pt "Times New Roman"">Â Â Â Â Â
</span></span></span>Points â?¦ a possibility but the
dwell is set at
exactly 60 degrees and does not waver at all when the engine
is running in the
shop.<span></span></p>
<p class="gmail-MsoListParagraphCxSpLast" style="margin:0in
0in 8pt
0.5in;line-height:107%;font-size:11pt;font-family:"Calibri",sans-serif"><span><span>4.<span
style="font:7pt "Times New Roman"">Â Â Â Â Â
</span></span></span>Fuel pump â?¦ if the engine was
starving for fuel
because of a fuel supply issue caused by a blockage or
failing pump the problem
would get worse when the demand for fuel increased, as in
climbing a hill of
full throttle. This was absolutely not the case.</p>
<p class="gmail-MsoListParagraphCxSpLast" style="margin:0in
0in 8pt
0.5in;line-height:107%;font-size:11pt;font-family:"Calibri",sans-serif"><br>
</p>
<p class="gmail-MsoListParagraphCxSpLast" style="margin:0in
0in 8pt
0.5in;line-height:107%;font-size:11pt;font-family:"Calibri",sans-serif">Any
ideas folks?<br>
</p>
<p class="gmail-MsoListParagraphCxSpLast" style="margin:0in
0in 8pt
0.5in;line-height:107%;font-size:11pt;font-family:"Calibri",sans-serif"><br>
</p>
</div>
</div>
<br>
</blockquote>
<br>
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