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Hi Michael -
Have you tried cycling the connections on the white wire from the ignition
switch to the coil, and also from the coil to the distributor.
You might also want to try disconnecting the black and white wire at the
coil from the battery master switch - if it=E2=80=99s failing you=E2=80=99l=
l get weird
symptoms like this. If that wire is disconnected the car should run no
problem. I don=E2=80=99t recall if that wire is separate from the distribu=
tor
wire, if it isn=E2=80=99t you=E2=80=99ll have to disconnect it from underne=
ath the master
switch itself.
Best,
Alan
On Thu, 29 Sep 2022 at 6:47 AM Michael Salter <michaelsalter@gmail.com>
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 i=
t
> 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 =E2=80=A6 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 =E2=80=A6 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 =E2=80=A6 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 =E2=80=A6 if the engine was starving for fuel because o=
f 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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<div dir=3D"auto">Hi Michael -</div><div dir=3D"auto"><br></div><div dir=3D=
"auto">Have you tried cycling the connections on the white wire from the ig=
nition switch to the coil, and also from the coil to the distributor.</div>=
<div dir=3D"auto"><br></div><div dir=3D"auto">You might also want to try di=
sconnecting the black and white wire at the coil from the battery master sw=
itch - if it=E2=80=99s failing you=E2=80=99ll get weird symptoms like this.=
=C2=A0 If that wire is disconnected the car should run no problem.=C2=A0 I =
don=E2=80=99t recall if that wire is separate from the distributor wire, if=
it isn=E2=80=99t you=E2=80=99ll have to disconnect it from underneath the =
master switch itself.</div><div dir=3D"auto"><br></div><div dir=3D"auto">Be=
st,</div><div dir=3D"auto"><br></div><div dir=3D"auto">Alan</div><div><br><=
div class=3D"gmail_quote"><div dir=3D"ltr" class=3D"gmail_attr">On Thu, 29 =
Sep 2022 at 6:47 AM Michael Salter <<a href=3D"mailto:michaelsalter@gmai=
l.com">michaelsalter@gmail.com</a>> wrote:<br></div><blockquote class=3D=
"gmail_quote" style=3D"margin:0px 0px 0px 0.8ex;border-left-width:1px;borde=
r-left-style:solid;padding-left:1ex;border-left-color:rgb(204,204,204)"><di=
v dir=3D"ltr"><div class=3D"gmail_default" style=3D"font-family:arial,sans-=
serif;font-size:small">
<p class=3D"MsoNormal" style=3D"text-align:center;margin:0in 0in 8pt;line-h=
eight:107%;font-size:11pt;font-family:Calibri,sans-serif" align=3D"center">=
<b style=3D"font-family:Calibri,sans-serif"><span style=3D"font-size:18pt;l=
ine-height:107%;font-family:Calibri,sans-serif"><span style=3D"font-family:=
Calibri,sans-serif"></span></span></b></p>
<p class=3D"MsoNormal" style=3D"margin:0in 0in 8pt;line-height:107%;font-si=
ze:11pt;font-family:Calibri,sans-serif">This problem has plagued me for ove=
r 1000 miles.<span style=3D"font-family:Calibri,sans-serif"></span></p>
<p class=3D"MsoNormal" style=3D"margin:0in 0in 8pt;line-height:107%;font-si=
ze:11pt;font-family:Calibri,sans-serif">Today I had to drive some 200 miles=
and this is how it went:<span style=3D"font-family:Calibri,sans-serif"></s=
pan></p>
<p class=3D"MsoNormal" style=3D"margin:0in 0in 8pt;line-height:107%;font-si=
ze:11pt;font-family:Calibri,sans-serif">Starting from cold I experienced a =
persistent and irregular misfire.
<span style=3D"font-family:Calibri,sans-serif"></span></p>
<p class=3D"MsoNormal" style=3D"margin:0in 0in 8pt;line-height:107%;font-si=
ze:11pt;font-family:Calibri,sans-serif">Pulling the choke out made no perce=
ivable difference.<span style=3D"font-family:Calibri,sans-serif"></span></p=
>
<p class=3D"MsoNormal" style=3D"margin:0in 0in 8pt;line-height:107%;font-si=
ze: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 style=3D"font=
-family:Calibri,sans-serif"></span></p>
<p class=3D"MsoNormal" style=3D"margin:0in 0in 8pt;line-height:107%;font-si=
ze:11pt;font-family:Calibri,sans-serif">Climbing slopes really made no diff=
erence, even when full
throttle was applied for 10 - 15 seconds.<span style=3D"font-family:Calibri=
,sans-serif"></span></p>
<p class=3D"MsoNormal" style=3D"margin:0in 0in 8pt;line-height:107%;font-si=
ze:11pt;font-family:Calibri,sans-serif">Misfire continued for some 90 miles=
with no change when the
engine was fully heated up.<span style=3D"font-family:Calibri,sans-serif"><=
/span></p>
<p class=3D"MsoNormal" style=3D"margin:0in 0in 8pt;line-height:107%;font-si=
ze:11pt;font-family:Calibri,sans-serif">I could really do nothing to influe=
nce the rate of the
misfire although it did seem to be slightly less evident at low throttle
settings.<span style=3D"font-family:Calibri,sans-serif"></span></p>
<p class=3D"MsoNormal" style=3D"margin:0in 0in 8pt;line-height:107%;font-si=
ze: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 c=
ompletely
and remained that way for at least 80 miles after which it started to misfi=
re
just a little as I came to the end of the trip.<span style=3D"font-family:C=
alibri,sans-serif"></span></p>
<p class=3D"MsoNormal" style=3D"margin:0in 0in 8pt;line-height:107%;font-si=
ze:11pt;font-family:Calibri,sans-serif"><u style=3D"font-family:Calibri,san=
s-serif"><span style=3D"font-family:Calibri,sans-serif">=C2=A0</span>POSSIB=
LE CAUSES</u><span style=3D"font-family:Calibri,sans-serif"></span></p>
<p style=3D"margin:0in 0in 0in 0.5in;line-height:107%;font-size:11pt;font-f=
amily:Calibri,sans-serif"><span style=3D"font-family:Calibri,sans-serif"><s=
pan style=3D"font-family:Calibri,sans-serif">1.<span style=3D"font-style:no=
rmal;font-variant-caps:normal;font-weight:normal;font-stretch:normal;font-s=
ize:7pt;line-height:normal;font-family:"Times New Roman"">=C2=A0=
=C2=A0=C2=A0=C2=A0=C2=A0
</span></span></span>Plugs =E2=80=A6 not like a bad plug. The misfire seems
to be more than 1 cylinder and never came close to being the regular beat t=
hat 1
plug misfiring produces. All the plugs have a healthy brown/ grey appearanc=
e.<span style=3D"font-family:Calibri,sans-serif"></span></p>
<p style=3D"margin:0in 0in 0in 0.5in;line-height:107%;font-size:11pt;font-f=
amily:Calibri,sans-serif"><span style=3D"font-family:Calibri,sans-serif"><s=
pan style=3D"font-family:Calibri,sans-serif">2.<span style=3D"font-style:no=
rmal;font-variant-caps:normal;font-weight:normal;font-stretch:normal;font-s=
ize:7pt;line-height:normal;font-family:"Times New Roman"">=C2=A0=
=C2=A0=C2=A0=C2=A0=C2=A0
</span></span></span>Coil =E2=80=A6<span style=3D"font-family:Calibri,sans-=
serif">=C2=A0 </span>In
my experience coils are very reliable but when they do fail they tend to fa=
il
as they warm up and the problem gets worse as the coil warms up<span style=
=3D"font-family:Calibri,sans-serif"></span></p>
<p style=3D"margin:0in 0in 0in 0.5in;line-height:107%;font-size:11pt;font-f=
amily:Calibri,sans-serif"><span style=3D"font-family:Calibri,sans-serif"><s=
pan style=3D"font-family:Calibri,sans-serif">3.<span style=3D"font-style:no=
rmal;font-variant-caps:normal;font-weight:normal;font-stretch:normal;font-s=
ize:7pt;line-height:normal;font-family:"Times New Roman"">=C2=A0=
=C2=A0=C2=A0=C2=A0=C2=A0
</span></span></span>Points =E2=80=A6 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 style=3D"font-family:Calibri,sans-serif"></span></p>
<p style=3D"margin:0in 0in 8pt 0.5in;line-height:107%;font-size:11pt;font-f=
amily:Calibri,sans-serif"><span style=3D"font-family:Calibri,sans-serif"><s=
pan style=3D"font-family:Calibri,sans-serif">4.<span style=3D"font-style:no=
rmal;font-variant-caps:normal;font-weight:normal;font-stretch:normal;font-s=
ize:7pt;line-height:normal;font-family:"Times New Roman"">=C2=A0=
=C2=A0=C2=A0=C2=A0=C2=A0
</span></span></span>Fuel pump =E2=80=A6 if the engine was starving for fue=
l
because of a fuel supply issue caused by a blockage or failing pump the pro=
blem
would get worse when the demand for fuel increased, as in climbing a hill o=
f
full throttle. This was absolutely not the case.</p><p style=3D"margin:0in =
0in 8pt 0.5in;line-height:107%;font-size:11pt;font-family:Calibri,sans-seri=
f"><br></p><p style=3D"margin:0in 0in 8pt 0.5in;line-height:107%;font-size:=
11pt;font-family:Calibri,sans-serif">Any ideas folks?<br></p><p style=3D"ma=
rgin:0in 0in 8pt 0.5in;line-height:107%;font-size:11pt;font-family:Calibri,=
sans-serif"><br></p>
</div></div>
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</blockquote></div></div>
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