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Michael- My guess is dirty fuel. Ethanol? Dirt specs in float bowls?=0AI=
f ethanol is used with "pink" Stabil it will create small black=0Apartic=
les in the float bowls and cause backfiring. If used with clear=0Agas it=
s not an issue. If you use ethanol fuel exclusively purchase the=0A"blue=
" Stabil...and yes I would use Stabil and possibly a fuel cleaner=0Ato g=
et rid of any water. Two cents from Hank=0A=0A=09-----------------------=
------------------From: "Michael Salter" =0ATo: "healeys@autox.team.net"=
=0ACc: =0ASent: Wednesday September 28 2022 3:43:57PM=0ASubject: [Healey=
s] Austin Healey 100 Misfire Diagnosis.=0A=0A=09 This problem has plague=
d me for over 1000 miles. =0A=0A=09 Today I had to drive some 200 miles=
and this is how it went: =0A=0A=09 Starting from cold I experienced a p=
ersistent and irregular misfire.=0A=0A=0A=09 Pulling the choke out made=
no perceivable difference. =0A=0A=09 Power was not much affected and th=
e car cruised along well in top=0Aoverdrive with just regular periods of=
misfiring. =0A=0A=09 Climbing slopes really made no difference, even wh=
en full throttle=0Awas applied for 10 - 15 seconds. =0A=0A=09 Misfire co=
ntinued for some 90 miles with no change when the engine=0Awas fully hea=
ted up. =0A=0A=09 I could really do nothing to influence the rate of the=
misfire=0Aalthough it did seem to be slightly less evident at low throt=
tle=0Asettings. =0A=0A=09 After 90 miles I stopped briefly to get fuel a=
nd upon starting off=0Ait was quite evident that the misfire had disappe=
ared almost=0Acompletely and remained that way for at least 80 miles aft=
er which it=0Astarted to misfire just a little as I came to the end of t=
he trip. =0A=0A=09 POSSIBLE CAUSES =0A=0A=09 1. Plugs =E2=80=A6 not li=
ke a bad plug. The misfire seems to be more than=0A1 cylinder and never=
came close to being the regular beat that 1 plug=0Amisfiring produces.=
All the plugs have a healthy brown/ grey=0Aappearance. =0A=0A=09 2. Co=
il =E2=80=A6 In my experience coils are very reliable but when they=0Ad=
o fail they tend to fail as they warm up and the problem gets worse=0Aas=
the coil warms up =0A=0A=09 3. Points =E2=80=A6 a possibility but the=
dwell is set at exactly 60=0Adegrees and does not waver at all when the=
engine is running in the=0Ashop. =0A=0A=09 4. Fuel pump =E2=80=A6 if t=
he engine was starving for fuel because of a=0Afuel supply issue caused=
by a blockage or failing pump the problem=0Awould get worse when the de=
mand for fuel increased, as in climbing a=0Ahill of full throttle. This=
was absolutely not the case. =0A=0A=09 Any ideas folks?=0A=0A
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<html><body>Michael- My guess is dirty fuel. Ethanol? Dirt specs in floa=
t bowls? If ethanol is used with "pink" Stabil it will create small blac=
k particles in the float bowls and cause backfiring. If used with clear=
gas its not an issue. If you use ethanol fuel exclusively purchas=
e the "blue" Stabil...and yes I would use Stabil and possibly a fuel cle=
aner to get rid of any water. Two cents from Hank<br><br><div class=3D"r=
eply-new-signature"></div><p>-----------------------------------------</=
p>From: "Michael Salter" <michaelsalter@gmail.com><br>To: "healeys@autox=
.team.net"<br>Cc: <br>Sent: Wednesday September 28 2022 3:43:57PM<br>Sub=
ject: [Healeys] Austin Healey 100 Misfire Diagnosis.<br><br>=0A<div dir=
=3D"ltr">=0A<div class=3D"gmail_default" style=3D"font-family:arial, san=
s-serif;font-size:small;">=0A<p class=3D"MsoNormal" style=3D"text-align:=
center;margin:0in 0in 8pt;line-height:107%;font-size:11pt;font-family:Ca=
libri, sans-serif;" align=3D"center"></p>=0A<p class=3D"MsoNormal" style=
=3D"margin:0in 0in 8pt;line-height:107%;font-size:11pt;font-family:Calib=
ri, sans-serif;">=0AThis problem has plagued me for over 1000 miles.</p>=
=0A<p class=3D"MsoNormal" style=3D"margin:0in 0in 8pt;line-height:107%;f=
ont-size:11pt;font-family:Calibri, sans-serif;">=0AToday I had to drive=
some 200 miles and this is how it went:</p>=0A<p class=3D"MsoNormal" st=
yle=3D"margin:0in 0in 8pt;line-height:107%;font-size:11pt;font-family:Ca=
libri, sans-serif;">=0AStarting from cold I experienced a persistent and=
irregular=0Amisfire.</p>=0A<p class=3D"MsoNormal" style=3D"margin:0in 0=
in 8pt;line-height:107%;font-size:11pt;font-family:Calibri, sans-serif;"=
>=0APulling the choke out made no perceivable difference.</p>=0A<p class=
=3D"MsoNormal" style=3D"margin:0in 0in 8pt;line-height:107%;font-size:11=
pt;font-family:Calibri, sans-serif;">=0APower was not much affected and=
the car cruised along well in top=0Aoverdrive with just regular periods=
of misfiring.</p>=0A<p class=3D"MsoNormal" style=3D"margin:0in 0in 8pt;=
line-height:107%;font-size:11pt;font-family:Calibri, sans-serif;">=0ACli=
mbing slopes really made no difference, even when full throttle=0Awas ap=
plied for 10 - 15 seconds.</p>=0A<p class=3D"MsoNormal" style=3D"margin:=
0in 0in 8pt;line-height:107%;font-size:11pt;font-family:Calibri, sans-se=
rif;">=0AMisfire continued for some 90 miles with no change when the eng=
ine=0Awas fully heated up.</p>=0A<p class=3D"MsoNormal" style=3D"margin:=
0in 0in 8pt;line-height:107%;font-size:11pt;font-family:Calibri, sans-se=
rif;">=0AI could really do nothing to influence the rate of the misfire=
=0Aalthough it did seem to be slightly less evident at low throttle=0Ase=
ttings.</p>=0A<p class=3D"MsoNormal" style=3D"margin:0in 0in 8pt;line-he=
ight:107%;font-size:11pt;font-family:Calibri, sans-serif;">=0AAfter 90 m=
iles I stopped briefly to get fuel and upon starting off=0Ait was quite=
evident that the misfire had disappeared almost=0Acompletely and remain=
ed that way for at least 80 miles after which=0Ait started to misfire ju=
st a little as I came to the end of the=0Atrip.</p>=0A<p class=3D"MsoNor=
mal" style=3D"margin:0in 0in 8pt;line-height:107%;font-size:11pt;font-fa=
mily:Calibri, sans-serif;">=0A<u><span> </span>POSSIBLE CAUSES</u><=
/p>=0A<p class=3D"gmail-MsoListParagraphCxSpFirst" style=3D"margin:0in 0=
in 0in .5in;line-height:107%;font-size:11pt;font-family:Calibri, sans-se=
rif;">=0A<span><span>1.<span style=3D"font:7pt 'Times New Roman';"> =
; </span></span></span>=0APlugs =E2=80=A6 not lik=
e a bad plug. The misfire seems to be more than 1=0Acylinder and never c=
ame close to being the regular beat that 1 plug=0Amisfiring produces. Al=
l the plugs have a healthy brown/ grey=0Aappearance.</p>=0A<p class=3D"g=
mail-MsoListParagraphCxSpMiddle" style=3D"margin:0in 0in 0in .5in;line-h=
eight:107%;font-size:11pt;font-family:Calibri, sans-serif;">=0A<span><sp=
an>2.<span style=3D"font:7pt 'Times New Roman';">  =
; </span></span></span>=0ACoil =E2=80=A6<span> </span> In my e=
xperience coils are very reliable=0Abut when they do fail they tend to f=
ail as they warm up and the=0Aproblem gets worse as the coil warms up</p=
>=0A<p class=3D"gmail-MsoListParagraphCxSpMiddle" style=3D"margin:0in 0i=
n 0in .5in;line-height:107%;font-size:11pt;font-family:Calibri, sans-ser=
if;">=0A<span><span>3.<span style=3D"font:7pt 'Times New Roman';"> =
</span></span></span>=0APoints =E2=80=A6 a possi=
bility but the dwell is set at exactly 60 degrees=0Aand does not waver a=
t all when the engine is running in the=0Ashop.</p>=0A<p class=3D"gmail-=
MsoListParagraphCxSpLast" style=3D"margin:0in 0in 8pt .5in;line-height:1=
07%;font-size:11pt;font-family:Calibri, sans-serif;">=0A<span><span>4.<s=
pan style=3D"font:7pt 'Times New Roman';"> =
</span></span></span>=0AFuel pump =E2=80=A6 if the engine was starving f=
or fuel because of a fuel=0Asupply issue caused by a blockage or failing=
pump the problem would=0Aget worse when the demand for fuel increased,=
as in climbing a hill=0Aof full throttle. This was absolutely not the c=
ase.</p>=0A<p class=3D"gmail-MsoListParagraphCxSpLast" style=3D"margin:0=
in 0in 8pt .5in;line-height:107%;font-size:11pt;font-family:Calibri, san=
s-serif;">=0A<br></p>=0A<p class=3D"gmail-MsoListParagraphCxSpLast" styl=
e=3D"margin:0in 0in 8pt .5in;line-height:107%;font-size:11pt;font-family=
:Calibri, sans-serif;">=0AAny ideas folks?<br></p>=0A<p class=3D"gmail-M=
soListParagraphCxSpLast" style=3D"margin:0in 0in 8pt .5in;line-height:10=
7%;font-size:11pt;font-family:Calibri, sans-serif;">=0A<br></p>=0A</div>=
=0A</div>=0A</michaelsalter@gmail.com></body></html>
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