Subject: [Healeys] Austin Healey 100 Misfire Diagnosis.

From: Michael Salter <[email-masked]>
Date: Wed, 28 Sep 2022 18:24:33 -0400

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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:&quot;Calibri&quot;,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:&quot;Calibri&quot;,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:&quot;Calibri&quot;,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:&quot;Calibri&quot;,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:&quot;Calibri&quot;,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:&quot;Calibri&quot;,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:&quot;Calibri&quot;,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:&quot;Calibri&quot;,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:&quot;Calibri&quot;,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:&quot;Calibri&quot;,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:&quot;Calibri&quot;,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:&quot;Calibri&quot;,sans-se=
rif"><span><span>1.<span style=3D"font:7pt &quot;Times New Roman&quot;">=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:&quot;Calibri&quot;,sans-s=
erif"><span><span>2.<span style=3D"font:7pt &quot;Times New Roman&quot;">=
=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:&quot;Calibri&quot;,sans-s=
erif"><span><span>3.<span style=3D"font:7pt &quot;Times New Roman&quot;">=
=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:&quot;Calibri&quot;,sans-ser=
if"><span><span>4.<span style=3D"font:7pt &quot;Times New Roman&quot;">=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:&quot;Calibri&quot;,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:&quot;Calibri&quot;,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:&quot;Calib=
ri&quot;,sans-serif"><br></p>

</div></div>

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_______________________________________________

Archive: http://www.team.net/pipermail/healeys http://autox.team.net/archive/healeys

[email-masked]
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From: Perry Small via Healeys <[email-masked]>
Date: Wed, 28 Sep 2022 21:35:12 -0400

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Sent from my iPhone

Begin forwarded message:

> From: Perry Small <[email-masked]>
> Date: September 28, 2022 at 8:42:39 PM EDT
> To: Michael Salter <[email-masked]>
> Subject: Re: [Healeys] Austin Healey 100 Misfire Diagnosis.
>=20
> =EF=BB=BFMichael
> Not sure what plug / coil wires you have on the car but it is a fairly com=
mon problem the develop poor connections at the wire ends on the cap and coi=
l. Sounds like a weak spark. The spark plug color being about the same on al=
l 4 plugs would lead me to the coil / distributor wire.=20
> Perry
>=20
> Sent from my iPhone
>=20
>>> On Sep 28, 2022, at 8:20 PM, Michael Salter via Healeys <[email-masked]=
eam.net> wrote:
>>>=20
>> =EF=BB=BF
>> Excellent suggestions Jim, thank you.=20
>>=20
>> M
>>=20
>>> On Wed., Sep. 28, 2022, 7:22 p.m. Rjhco, <[email-masked]> wrote:
>>> It is not fuel.  It is an intermittent ground.  Check the ground wire in=
side of the distributor and on the coil. If no luck, replace high tension fr=
om coil to distributor.
>>> Also, check ground from engine to chassis.  Do you have woven wire groun=
d?  They rust internally.
>>> Best regards,
>>> Jim
>>>=20
>>>>> On Sep 28, 2022, at 5:35 PM, Michael Salter <[email-masked]> w=
rote:
>>>>>=20
>>>> =EF=BB=BF
>>>>=20
>>>>=20
>>>>=20
>>>>=20
>>>> Power was not much affected and the car cruised along well in top overd=
rive with just regular periods of misfiring.
>>>>=20
>>>> Climbing slopes really made no difference, even when full throttle was a=
pplied for 10 - 15 seconds.
>>>>=20
>>>> Misfire continued for some 90 miles with no change when the engine was f=
ully heated up.
>>>>=20
>>>> 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.
>>>>=20
>>>> After 90 miles I stopped briefly to get fuel and upon starting off it w=
as quite evident that the misfire had disappeared almost completely and rema=
ined 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.
>>>>=20
>>>>  POSSIBLE CAUSES
>>>>=20
>>>> 1.      Plugs =E2=80=A6 not like a bad plug. The misfire seems to be mo=
re than 1 cylinder and never came close to being the regular beat that 1 plu=
g misfiring produces. All the plugs have a healthy brown/ grey appearance.
>>>> 2.      Coil =E2=80=A6  In my experience coils are very reliable but wh=
en 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 6=
0 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=
 of a fuel supply issue caused by a blockage or failing pump the problem wou=
ld get worse when the demand for fuel increased, as in climbing a hill of fu=
ll throttle. This was absolutely not the case.
>>>>=20
>>>>=20
>>>>=20
>>>>=20
>>>>=20
>>>>=20
>>>> Support Team.Net http://www.team.net/donate.html
>>>> Suggested annual donation  $12.75
>>>>=20
>>>> Archive: http://www.team.net/pipermail/healeys http://autox.team.net/ar=
chive/healeys
>>>>=20
>>>>=20
>>>> Unsubscribe/Manage: http://autox.team.net/mailman/options/healeys/rjhco=
[email-masked]
>>>>=20
>> Support Team.Net http://www.team.net/donate.html
>> Suggested annual donation  $12.75
>>=20
>> Archive: http://www.team.net/pipermail/healeys http://autox.team.net/arch=
ive/healeys
>>=20
>>=20
>> Unsubscribe/Manage: http://autox.team.net/mailman/options/healeys/healeyg=
[email-masked]
>>=20

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Content-Transfer-Encoding: quoted-printable

<html><head><meta http-equiv=3D"content-type" content=3D"text/html; charset=3D=
utf-8"></head><body dir=3D"auto"><br><br><div dir=3D"ltr">Sent from my iPhon=
e</div><div dir=3D"ltr"><br>Begin forwarded message:<br><br></div><blockquot=
e type=3D"cite"><div dir=3D"ltr"><b>From:</b> Perry Small &lt;healeyguy@aol.=
com&gt;<br><b>Date:</b> September 28, 2022 at 8:42:39 PM EDT<br><b>To:</b> M=
ichael Salter &lt;[email-masked]&gt;<br><b>Subject:</b> <b>Re: [Hea=
leys] Austin Healey 100 Misfire Diagnosis.</b><br><br></div></blockquote><bl=
ockquote type=3D"cite"><div dir=3D"ltr">=EF=BB=BF<meta http-equiv=3D"content=
-type" content=3D"text/html; charset=3Dutf-8">Michael<div>Not sure what plug=
 / coil wires you have on the car but it is a fairly common problem the deve=
lop poor connections at the wire ends on the cap and coil. Sounds like a wea=
k spark. The spark plug color being about the same on all 4 plugs would lead=
 me to the coil / distributor wire.&nbsp;</div><div>Perry<br><br><div dir=3D=
"ltr">Sent from my iPhone</div><div dir=3D"ltr"><br><blockquote type=3D"cite=
">On Sep 28, 2022, at 8:20 PM, Michael Salter via Healeys &lt;healeys@autox.=
team.net&gt; wrote:<br><br></blockquote></div><blockquote type=3D"cite"><div=
 dir=3D"ltr">=EF=BB=BF<div dir=3D"auto">Excellent suggestions Jim, thank you=
.&nbsp;<div dir=3D"auto"><br></div><div dir=3D"auto">M</div></div><br><div c=
lass=3D"gmail_quote"><div dir=3D"ltr" class=3D"gmail_attr">On Wed., Sep. 28,=
 2022, 7:22 p.m. Rjhco, &lt;<a href=3D"mailto:[email-masked]">rjhco459@g=
mail.com</a>&gt; wrote:<br></div><blockquote class=3D"gmail_quote" style=3D"=
margin:0 0 0 .8ex;border-left:1px #ccc solid;padding-left:1ex"><div dir=3D"a=
uto">It is not fuel.&nbsp; It is an intermittent ground.&nbsp; Check the gro=
und wire inside of the distributor and on the coil. If no luck, replace high=
 tension from coil to distributor.<div>Also, check ground from engine to cha=
ssis.&nbsp; Do you have woven wire ground?&nbsp; They rust internally.<br><d=
iv dir=3D"ltr">Best regards,<div>Jim</div></div><div dir=3D"ltr"><br><blockq=
uote type=3D"cite">On Sep 28, 2022, at 5:35 PM, Michael Salter &lt;<a href=3D=
"mailto:[email-masked]" target=3D"_blank" rel=3D"noreferrer">michae=
[email-masked]</a>&gt; wrote:<br><br></blockquote></div><blockquote type=3D=
"cite"><div dir=3D"ltr">=EF=BB=BF<div dir=3D"ltr"><div class=3D"gmail_defaul=
t" style=3D"font-family:arial,sans-serif;font-size:small">

<p class=3D"MsoNormal" style=3D"text-align:center;margin:0in 0in 8pt;line-he=
ight:107%;font-size:11pt;font-family:&quot;Calibri&quot;,sans-serif" align=3D=
"center"><b><span style=3D"font-size:18pt;line-height:107%"><span></span></s=
pan></b></p>

<p class=3D"MsoNormal" style=3D"margin:0in 0in 8pt;line-height:107%;font-siz=
e:11pt;font-family:&quot;Calibri&quot;,sans-serif">This problem has plagued m=
e for over 1000 miles.<span></span></p>

<p class=3D"MsoNormal" style=3D"margin:0in 0in 8pt;line-height:107%;font-siz=
e:11pt;font-family:&quot;Calibri&quot;,sans-serif">Today I had to drive some=
 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-siz=
e:11pt;font-family:&quot;Calibri&quot;,sans-serif">Starting from cold I expe=
rienced a persistent and irregular misfire.
<span></span></p>

<p class=3D"MsoNormal" style=3D"margin:0in 0in 8pt;line-height:107%;font-siz=
e:11pt;font-family:&quot;Calibri&quot;,sans-serif">Pulling the choke out mad=
e no perceivable difference.<span></span></p>

<p class=3D"MsoNormal" style=3D"margin:0in 0in 8pt;line-height:107%;font-siz=
e:11pt;font-family:&quot;Calibri&quot;,sans-serif">Power was not much affect=
ed 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-siz=
e:11pt;font-family:&quot;Calibri&quot;,sans-serif">Climbing slopes really ma=
de 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-siz=
e:11pt;font-family:&quot;Calibri&quot;,sans-serif">Misfire continued for som=
e 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-siz=
e:11pt;font-family:&quot;Calibri&quot;,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=3D"MsoNormal" style=3D"margin:0in 0in 8pt;line-height:107%;font-siz=
e:11pt;font-family:&quot;Calibri&quot;,sans-serif">After 90 miles I stopped b=
riefly to get fuel and upon
starting off it was quite evident that the misfire had disappeared almost co=
mpletely
and remained that way for at least 80 miles after which it started to misfir=
e
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-siz=
e:11pt;font-family:&quot;Calibri&quot;,sans-serif"><u><span>&nbsp;</span>POS=
SIBLE CAUSES</u><span></span></p>

<p style=3D"margin:0in 0in 0in 0.5in;line-height:107%;font-size:11pt;font-fa=
mily:&quot;Calibri&quot;,sans-serif"><span><span>1.<span style=3D"font:7pt &=
quot;Times New Roman&quot;">&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;
</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 th=
at 1
plug misfiring produces. All the plugs have a healthy brown/ grey appearance=
.<span></span></p>

<p style=3D"margin:0in 0in 0in 0.5in;line-height:107%;font-size:11pt;font-fa=
mily:&quot;Calibri&quot;,sans-serif"><span><span>2.<span style=3D"font:7pt &=
quot;Times New Roman&quot;">&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;
</span></span></span>Coil =E2=80=A6<span>&nbsp; </span>In
my experience coils are very reliable but when they do fail they tend to fai=
l
as they warm up and the problem gets worse as the coil warms up<span></span>=
</p>

<p style=3D"margin:0in 0in 0in 0.5in;line-height:107%;font-size:11pt;font-fa=
mily:&quot;Calibri&quot;,sans-serif"><span><span>3.<span style=3D"font:7pt &=
quot;Times New Roman&quot;">&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;
</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 t=
he
shop.<span></span></p>

<p style=3D"margin:0in 0in 8pt 0.5in;line-height:107%;font-size:11pt;font-fa=
mily:&quot;Calibri&quot;,sans-serif"><span><span>4.<span style=3D"font:7pt &=
quot;Times New Roman&quot;">&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;
</span></span></span>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 prob=
lem
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 style=3D"margin:0in 0=
in 8pt 0.5in;line-height:107%;font-size:11pt;font-family:&quot;Calibri&quot;=
,sans-serif"><br></p><p style=3D"margin:0in 0in 8pt 0.5in;line-height:107%;f=
ont-size:11pt;font-family:&quot;Calibri&quot;,sans-serif">Any ideas folks?<b=
r></p><p style=3D"margin:0in 0in 8pt 0.5in;line-height:107%;font-size:11pt;f=
ont-family:&quot;Calibri&quot;,sans-serif"><br></p>

</div></div>
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[email-masked]

--===============5023999517448985358==--

---

From: Henry G Leach via Healeys <[email-masked]>
Date: Thu, 29 Sep 2022 02:50:32 +0000 Tlk7bnrsnTWm4ukbxGZkCF6R92BYaSPp3zEAwNmP9jxc3VLZUmkyF2bC6aROk0Dl4oo06ipHfKo00dq7jbQboeVtqscYoF94lerTRy4x0nyZMM85kgTq0hDy

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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: "[email-masked]"=
=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.&nbsp; 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" <[email-masked]><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>&nbsp;</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';">&nbsp=
;&nbsp;&nbsp;&nbsp;&nbsp;</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';">&nbsp;&nbsp;&nbsp;&nbsp=
;&nbsp;</span></span></span>=0ACoil =E2=80=A6<span>&nbsp;</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';">&nbsp;=
&nbsp;&nbsp;&nbsp;&nbsp;</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';">&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;=
</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</[email-masked]></body></html>

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[email-masked]

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