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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 =E2=80=A6 not like a bad plug. The misfire seems to be more t=
han 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 t=
hey 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 d=
egrees
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 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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<div dir=3D"ltr"><div class=3D"gmail_default" style=3D"font-family:arial,sa=
ns-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><span style=3D"font-size:18pt;line-height:107%"><span></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 plague=
d me for over 1000 miles.<span></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 so=
me 200 miles and this is how it went:<span></span></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 ex=
perienced a persistent and irregular misfire.
<span></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 m=
ade no perceivable difference.<span></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 affe=
cted and the car cruised along well
in top overdrive with just regular periods of misfiring.<span></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 difference, even when full
throttle was applied for 10 - 15 seconds.<span></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 s=
ome 90 miles with no change when the
engine was fully heated up.<span></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 nothi=
ng 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=3D"MsoNormal" style=3D"margin:0in 0in 8pt;line-height:107%;font-si=
ze:11pt;font-family:"Calibri",sans-serif">After 90 miles I stoppe=
d 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></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><span>=C2=A0</span>P=
OSSIBLE CAUSES</u><span></span></p>
<p class=3D"gmail-MsoListParagraphCxSpFirst" style=3D"margin:0in 0in 0in 0.=
5in;line-height:107%;font-size:11pt;font-family:"Calibri",sans-se=
rif"><span><span>1.<span style=3D"font:7pt "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></span></p>
<p class=3D"gmail-MsoListParagraphCxSpMiddle" style=3D"margin:0in 0in 0in 0=
.5in;line-height:107%;font-size:11pt;font-family:"Calibri",sans-s=
erif"><span><span>2.<span style=3D"font:7pt "Times New Roman"">=
=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0
</span></span></span>Coil =E2=80=A6<span>=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></span=
></p>
<p class=3D"gmail-MsoListParagraphCxSpMiddle" style=3D"margin:0in 0in 0in 0=
.5in;line-height:107%;font-size:11pt;font-family:"Calibri",sans-s=
erif"><span><span>3.<span style=3D"font:7pt "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></span></p>
<p class=3D"gmail-MsoListParagraphCxSpLast" style=3D"margin:0in 0in 8pt 0.5=
in;line-height:107%;font-size:11pt;font-family:"Calibri",sans-ser=
if"><span><span>4.<span style=3D"font:7pt "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 class=3D"gmail-MsoLi=
stParagraphCxSpLast" style=3D"margin:0in 0in 8pt 0.5in;line-height:107%;fon=
t-size:11pt;font-family:"Calibri",sans-serif"><br></p><p class=3D=
"gmail-MsoListParagraphCxSpLast" style=3D"margin:0in 0in 8pt 0.5in;line-hei=
ght:107%;font-size:11pt;font-family:"Calibri",sans-serif">Any ide=
as folks?<br></p><p class=3D"gmail-MsoListParagraphCxSpLast" style=3D"margi=
n:0in 0in 8pt 0.5in;line-height:107%;font-size:11pt;font-family:"Calib=
ri",sans-serif"><br></p>
</div></div>
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