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Re: [Healeys] Austin Healey 100 Misfire Diagnosis.

To: Alan Seigrist <healey.nut@gmail.com>
Subject: Re: [Healeys] Austin Healey 100 Misfire Diagnosis.
From: Michael Salter <michaelsalter@gmail.com>
Date: Thu, 29 Sep 2022 22:01:51 -0400
Cc: Healey list <healeys@autox.team.net>
Delivered-to: mharc@autox.team.net
Delivered-to: healeys@autox.team.net
References: <CAB3i7LJ7O3Z58YEjEbdVVdpz7Q_9ovaggKrJBXLiwLQ2ksnPrQ@mail.gmail.com> <CAFBXTkK57aopOM4-+8+-59CHyryiQk_OO4i_jVW5+v-pGFvAbA@mail.gmail.com> <77e2342e-cd47-6cec-8b0b-be47f9d1eee4@comcast.net> <CAFBXTkLUh25V-PH1cPPhZs+-ARzXYURu0b_4Dr2jpkzF5BHP=A@mail.gmail.com> <CAL28cLWWZq0YiWQFhr+YO7Bx1C6J0OWufA560Xd9eATYgTXWkA@mail.gmail.com> <CAFBXTkK5EzwLHKog17S3kvqCk5FcejjAMsrdtT8EAnuz8wY8Kw@mail.gmail.com> <CAB3i7LKQgDNaD06mxvSdFXBHogvR=K-hnHzbz0Lg-VuETZZYNg@mail.gmail.com> <SA2PR06MB73537A571A161A69CBDE3C41FD579@SA2PR06MB7353.namprd06.prod.outlook.com> <CAPTa0B6_Sb-YfQncdHFB2tajgnY_t--H+QYm0fM8+BPE1kWf8Q@mail.gmail.com> <CAFBXTkK61J8WqFWNuVjnAZBy5n1cnc7uDTQFt0fDKs98QYY9pw@mail.gmail.com>
--===============2129449782128040298==

--0000000000005ac0c005e9db6190
Content-Transfer-Encoding: quoted-printable

BUT ... the fact that full throttle and climbing a slope with no change in
the amount of misfiring tends to negate fuel blockage as a cause.
I'm starting to think that the refueling situation is something of a "red
herring" although it certainly is an odd one.

On Thu., Sep. 29, 2022, 9:23 p.m. Alan Seigrist, <healey.nut@gmail.com>
wrote:

> Good point.  I had a very similar experience when I had mistakenly used
> high heat silicone to seal the fuel tank sender, and I didn=E2=80=99t kno=
w that
> fuel caused flakes of it to fall off and plug the pickup intermittently.
>
> On Fri, 30 Sep 2022 at 4:38 AM, Michael Oritt <michael.oritt@gmail.com>
> wrote:
>
>> I had a similar miss that was caused by a leaf that had gotten into the
>> tank.  It would be pulled against the pickup by fuel flow and cause the
>> engine to lose power on all cylinders, as opposed to a miss.  When I eit=
her
>> got off the gas pedal or shut the engine down the leaf would apparently
>> fall away from the pickup and everything would be fine until the leaf wa=
s
>> once again pulled against the pickup, etc. etc.
>>
>> I empirically came up with this theory after I pulled the fuel sender,
>> searched around in the tank with a flashlight and found the leaf, and af=
ter
>> I removed it the miss went away.  How the leaf got into the tank when th=
e
>> fuel filler is inside the boot is a larger issue I never figured out.
>>
>> Best--Michael Oritt
>>
>>
>> On Thu, Sep 29, 2022 at 11:01 AM Don Anglesey via Healeys <
>> healeys@autox.team.net> wrote:
>>
>>> I suspect that when the tank is filled any sediment or debris around th=
e
>>> tank intake is redistributed thru the fuel then it settles again.  Clas=
sic
>>> sign of bad fuel filter or sediment in tank.
>>>
>>> Don
>>>
>>>
>>>
>>>
>>>
>>> Sent from Mail <https://go.microsoft.com/fwlink/?LinkId=3D550986> for
>>> Windows
>>>
>>>
>>>
>>> *From: *Michael Salter <michaelsalter@gmail.com>
>>> *Sent: *Thursday, September 29, 2022 8:10 AM
>>> *To: *Alan Seigrist <healey.nut@gmail.com>
>>> *Cc: *Healey list <healeys@autox.team.net>
>>> *Subject: *Re: [Healeys] Austin Healey 100 Misfire Diagnosis.
>>>
>>>
>>>
>>> Thanks to all who have obviously given this misfire issue considerable
>>> thought. I will be sure to check all suggestions.
>>>
>>> I  should like to point out however that it is the immediate vanishing
>>> of the misfire after filling the fuel tank that has me confused.
>>>
>>> This has happened three times simce the problem appeared.
>>>
>>> I just don't understand how an ignition problem could change as a resul=
t
>>> of filling the tank.
>>>
>>> Furthermore I'm convinced that this is not a fuel starvation problem
>>> because the amount of engine power being used has no effect.
>>>
>>> Totally baffled.
>>>
>>> Thanks again to all ... I'll  report back.
>>>
>>>
>>>
>>> On Thu., Sep. 29, 2022, 9:14 a.m. Alan Seigrist via Healeys, <
>>> healeys@autox.team.net> wrote:
>>>
>>> Hi John -
>>>
>>>
>>>
>>> Yes, that was the point I was trying to make, sorry if it fell through
>>> bad interpretation!  As Ed McMahon used to say, "You Are Correct Sir!"
>>>
>>>
>>>
>>> Cheers,
>>>
>>>
>>>
>>> Alan
>>>
>>>
>>>
>>> On Thu, Sep 29, 2022 at 7:53 PM john harper <ah100tech@gmail.com> wrote=
:
>>>
>>> Alan
>>>
>>>
>>>
>>> Coils can fail with heat and then recover when cooled. I had one that
>>> had these symptoms and when looking closely I saw that the insulating o=
il
>>> had run out through a very small crack in the bottom of the case.
>>>
>>>
>>>
>>> On Thu, 29 Sept 2022 at 10:34, Alan Seigrist <healey.nut@gmail.com>
>>> wrote:
>>>
>>> Michael -
>>>
>>> Just as a follow up to my email since the symptoms seem to manifest
>>> themself  ...
>>>
>>>    - whether the car is warmed up or not - this typically will exclude
>>>    anything related to fuel or the coil
>>>    - whether the car is under load or not - this typically will exclude
>>>    anything related to fuel
>>>    - whether the choke is pulled or not - this typically will exclude
>>>    anything related to fuel
>>>    - somewhat intermittent but systematically under all conditions -
>>>    suggests to me wiring / ground issues
>>>
>>> Given this I'd check (as a priority):
>>>
>>>    - Battery Master (when these fail they will ground the coil)
>>>    - primary ignition wire (white) from the switch to coil (cycle the
>>>    connections)
>>>    - motor ground straps (cycle the connections)
>>>    - loose wires in the dizzy
>>>    - loose ignition wires into the dizzy or spark plug
>>>
>>> Other things to possibly do (as secondary):
>>>
>>>    - replace rotor
>>>    - replace dizzy cap
>>>
>>> I don't think it would be contacts or condensor simply because this
>>> would either be very regular all the time, or maybe sensitive to temp.
>>>
>>> Best,
>>>
>>>
>>>
>>> Alan
>>>
>>>
>>>
>>> On Thu, Sep 29, 2022 at 4:46 PM Bob Spidell <bspidell@comcast.net>
>>> wrote:
>>>
>>> re: "... I don=E2=80=99t recall if that wire is separate from the distr=
ibutor
>>> wire ..."
>>>
>>> It is (or should be). If the battery switch is in the 'OFF' position it
>>> grounds the coil primary so no spark.
>>>
>>> On 9/28/2022 8:34 PM, Alan Seigrist wrote:
>>>
>>> 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 th=
e
>>> coil from the battery master switch - if it=E2=80=99s failing you=E2=80=
=99ll 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 dist=
ributor
>>> wire, if it isn=E2=80=99t you=E2=80=99ll have to disconnect it from und=
erneath the master
>>> switch itself.
>>>
>>>
>>>
>>> Best,
>>>
>>>
>>>
>>> Alan
>>>
>>>
>>>
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--0000000000005ac0c005e9db6190
Content-Transfer-Encoding: quoted-printable

<div dir=3D"auto">BUT ... the fact that full throttle and climbing a slope =
with no change in the amount of misfiring tends to negate fuel blockage as =
a cause.=C2=A0<div dir=3D"auto">I&#39;m starting to think that the refuelin=
g situation is something of a &quot;red herring&quot; although it certainly=
 is an odd one.</div></div><br><div class=3D"gmail_quote"><div dir=3D"ltr" =
class=3D"gmail_attr">On Thu., Sep. 29, 2022, 9:23 p.m. Alan Seigrist, &lt;<=
a href=3D"mailto:healey.nut@gmail.com";>healey.nut@gmail.com</a>&gt; wrote:<=
br></div><blockquote class=3D"gmail_quote" style=3D"margin:0 0 0 .8ex;borde=
r-left:1px #ccc solid;padding-left:1ex"><div dir=3D"auto">Good point.=C2=A0=
 I had a very similar experience when I had mistakenly used high heat silic=
one to seal the fuel tank sender, and I didn=E2=80=99t know that fuel cause=
d flakes of it to fall off and plug the pickup intermittently.</div><div><b=
r><div class=3D"gmail_quote"><div dir=3D"ltr" class=3D"gmail_attr">On Fri, =
30 Sep 2022 at 4:38 AM, Michael Oritt &lt;<a href=3D"mailto:michael.oritt@g=
mail.com" target=3D"_blank" rel=3D"noreferrer">michael.oritt@gmail.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"ltr"><div cl=
ass=3D"gmail_default" style=3D"color:#3333ff">I had a similar miss that was=
 caused by a leaf that had gotten into the tank.=C2=A0 It would be pulled a=
gainst the pickup by fuel flow and cause the engine to lose power on all cy=
linders, as opposed to a miss.=C2=A0 When I either got off the gas pedal or=
 shut the engine down the leaf would apparently fall away from the pickup a=
nd everything would be fine until the leaf was once again pulled against th=
e pickup, etc. etc.=C2=A0</div><div class=3D"gmail_default" style=3D"color:=
#3333ff"><br></div><div class=3D"gmail_default" style=3D"color:#3333ff">I e=
mpirically came up with this theory after I pulled the fuel sender, searche=
d around in the tank with a flashlight and found the leaf, and after I remo=
ved it the miss went away.=C2=A0 How the leaf got into the tank when the fu=
el filler is inside the boot is a larger issue I never figured out.</div><d=
iv class=3D"gmail_default" style=3D"color:#3333ff"><br></div><div class=3D"=
gmail_default" style=3D"color:#3333ff">Best--Michael Oritt</div><div class=
=3D"gmail_default" style=3D"color:#3333ff"><br></div></div><br><div class=
=3D"gmail_quote"></div><div class=3D"gmail_quote"><div dir=3D"ltr" class=3D=
"gmail_attr">On Thu, Sep 29, 2022 at 11:01 AM Don Anglesey via Healeys &lt;=
<a href=3D"mailto:healeys@autox.team.net"; target=3D"_blank" rel=3D"noreferr=
er">healeys@autox.team.net</a>&gt; wrote:<br></div></div><div class=3D"gmai=
l_quote"><blockquote class=3D"gmail_quote" style=3D"margin:0px 0px 0px 0.8e=
x;border-left:1px solid rgb(204,204,204);padding-left:1ex"><div></div></blo=
ckquote></div><div class=3D"gmail_quote"><blockquote class=3D"gmail_quote" =
style=3D"margin:0px 0px 0px 0.8ex;border-left:1px solid rgb(204,204,204);pa=
dding-left:1ex"><div>





<div lang=3D"EN-US">
<div>
<p class=3D"MsoNormal">I suspect that when the tank is filled any sediment =
or debris around the tank intake is redistributed thru the fuel then it set=
tles again.=C2=A0 Classic sign of bad fuel filter or sediment in tank.</p>
<p class=3D"MsoNormal">Don</p>
<p class=3D"MsoNormal"><u></u>=C2=A0<u></u></p>
<p class=3D"MsoNormal"><u></u>=C2=A0<u></u></p>
<p class=3D"MsoNormal">Sent from <a href=3D"https://go.microsoft.com/fwlink=
/?LinkId=3D550986" target=3D"_blank" rel=3D"noreferrer">
Mail</a> for Windows</p>
<p class=3D"MsoNormal"><u></u>=C2=A0<u></u></p>
<div style=3D"border-right:none;border-bottom:none;border-left:none;border-=
top:1pt solid rgb(225,225,225);padding:3pt 0in 0in">
<p class=3D"MsoNormal" style=3D"border:none;padding:0in"><b>From: </b><a hr=
ef=3D"mailto:michaelsalter@gmail.com"; target=3D"_blank" rel=3D"noreferrer">=
Michael Salter</a><br>
<b>Sent: </b>Thursday, September 29, 2022 8:10 AM<br>
<b>To: </b><a href=3D"mailto:healey.nut@gmail.com"; target=3D"_blank" rel=3D=
"noreferrer">Alan Seigrist</a><br>
<b>Cc: </b><a href=3D"mailto:healeys@autox.team.net"; target=3D"_blank" rel=
=3D"noreferrer">Healey list</a><br>
<b>Subject: </b>Re: [Healeys] Austin Healey 100 Misfire Diagnosis.</p>
</div>
<p class=3D"MsoNormal"><u></u>=C2=A0<u></u></p>
<div>
<p class=3D"MsoNormal">Thanks to all who have obviously given this misfire =
issue considerable thought. I will be sure to check all suggestions.=C2=A0<=
u></u><u></u></p>
<div>
<p class=3D"MsoNormal">I=C2=A0 should like to point out however that it is =
the immediate vanishing of the misfire after filling the fuel tank that has=
 me confused.=C2=A0<u></u><u></u></p>
</div>
<div>
<p class=3D"MsoNormal">This has happened three times simce the problem appe=
ared.<u></u><u></u></p>
</div>
<div>
<p class=3D"MsoNormal">I just don&#39;t understand how an ignition problem =
could change as a result of filling the tank.<u></u><u></u></p>
</div>
<div>
<p class=3D"MsoNormal">Furthermore I&#39;m convinced that this is not a fue=
l starvation problem because the amount of engine power being used has no e=
ffect.<u></u><u></u></p>
</div>
<div>
<p class=3D"MsoNormal">Totally baffled.<u></u><u></u></p>
</div>
<div>
<p class=3D"MsoNormal">Thanks again to all ... I&#39;ll=C2=A0 report back.<=
u></u><u></u></p>
</div>
</div>
<p class=3D"MsoNormal"><u></u>=C2=A0<u></u></p>
<div>
<div>
<p class=3D"MsoNormal">On Thu., Sep. 29, 2022, 9:14 a.m. Alan Seigrist via =
Healeys, &lt;<a href=3D"mailto:healeys@autox.team.net"; target=3D"_blank" re=
l=3D"noreferrer">healeys@autox.team.net</a>&gt; wrote:<u></u><u></u></p>
</div>
<blockquote style=3D"border-top:none;border-right:none;border-bottom:none;b=
order-left:1pt solid rgb(204,204,204);padding:0in 0in 0in 6pt;margin-left:4=
.8pt;margin-right:0in">
<div>
<p class=3D"MsoNormal">Hi John -<u></u><u></u></p>
<div>
<p class=3D"MsoNormal"><u></u>=C2=A0<u></u></p>
</div>
<div>
<p class=3D"MsoNormal">Yes, that was the point I was trying to make, sorry =
if it fell through bad interpretation!=C2=A0 As Ed McMahon used to say, &qu=
ot;You Are Correct Sir!&quot;<u></u><u></u></p>
</div>
<div>
<p class=3D"MsoNormal"><u></u>=C2=A0<u></u></p>
</div>
<div>
<p class=3D"MsoNormal">Cheers,<u></u><u></u></p>
</div>
<div>
<p class=3D"MsoNormal"><u></u>=C2=A0<u></u></p>
</div>
<div>
<p class=3D"MsoNormal">Alan<u></u><u></u></p>
</div>
</div>
<p class=3D"MsoNormal"><u></u>=C2=A0<u></u></p>
<div>
<div>
<p class=3D"MsoNormal">On Thu, Sep 29, 2022 at 7:53 PM john harper &lt;<a h=
ref=3D"mailto:ah100tech@gmail.com"; target=3D"_blank" rel=3D"noreferrer">ah1=
00tech@gmail.com</a>&gt; wrote:<u></u><u></u></p>
</div>
<blockquote style=3D"border-top:none;border-right:none;border-bottom:none;b=
order-left:1pt solid rgb(204,204,204);padding:0in 0in 0in 6pt;margin-left:4=
.8pt;margin-right:0in">
<div>
<p class=3D"MsoNormal">Alan<u></u><u></u></p>
<div>
<p class=3D"MsoNormal"><u></u>=C2=A0<u></u></p>
</div>
<div>
<p class=3D"MsoNormal">Coils can fail with heat and then recover when coole=
d. I had one that had these symptoms and when looking closely I saw that th=
e insulating oil had run out through a very small=C2=A0crack in the bottom =
of the case.<u></u><u></u></p>
</div>
</div>
<p class=3D"MsoNormal"><u></u>=C2=A0<u></u></p>
<div>
<div>
<p class=3D"MsoNormal">On Thu, 29 Sept 2022 at 10:34, Alan Seigrist &lt;<a =
href=3D"mailto:healey.nut@gmail.com"; target=3D"_blank" rel=3D"noreferrer">h=
ealey.nut@gmail.com</a>&gt; wrote:<u></u><u></u></p>
</div>
<blockquote style=3D"border-top:none;border-right:none;border-bottom:none;b=
order-left:1pt solid rgb(204,204,204);padding:0in 0in 0in 6pt;margin-left:4=
.8pt;margin-right:0in">
<div>
<div>
<p class=3D"MsoNormal">Michael -<br>
<br>
Just as a follow up to my email since the symptoms seem to manifest themsel=
f=C2=A0=C2=A0...=C2=A0<u></u><u></u></p>
</div>
<div>
<ul type=3D"disc">
<li class=3D"MsoNormal">
whether the car is warmed up or not - this typically will exclude anything =
related to fuel or the coil<u></u><u></u></li><li class=3D"MsoNormal">
whether the car is under load or not - this typically will exclude anything=
 related to fuel<u></u><u></u></li><li class=3D"MsoNormal">
whether the choke is pulled or not - this typically will exclude anything r=
elated to fuel<u></u><u></u></li><li class=3D"MsoNormal">
somewhat intermittent but systematically under all conditions - suggests to=
 me wiring / ground issues<u></u><u></u></li></ul>
<div>
<p class=3D"MsoNormal">Given this I&#39;d check (as a priority):<u></u><u><=
/u></p>
<ul type=3D"disc">
<li class=3D"MsoNormal">
Battery Master (when these fail they will ground the coil)<u></u><u></u></l=
i><li class=3D"MsoNormal">
primary ignition wire (white) from the switch to coil (cycle the connection=
s)<u></u><u></u></li><li class=3D"MsoNormal">
motor ground straps (cycle the connections)<u></u><u></u></li><li class=3D"=
MsoNormal">
loose wires in the dizzy<u></u><u></u></li><li class=3D"MsoNormal">
loose ignition=C2=A0wires into the dizzy or spark plug<u></u><u></u></li></=
ul>
<div>
<p class=3D"MsoNormal">Other things to possibly do (as secondary):<u></u><u=
></u></p>
</div>
</div>
<div>
<ul type=3D"disc">
<li class=3D"MsoNormal">
replace rotor<u></u><u></u></li><li class=3D"MsoNormal">
replace dizzy cap<u></u><u></u></li></ul>
</div>
<p class=3D"MsoNormal">I don&#39;t think it would be contacts or condensor =
simply because this would either be very regular=C2=A0all the time, or mayb=
e sensitive to temp.<br>
<br>
Best,<u></u><u></u></p>
</div>
<div>
<p class=3D"MsoNormal"><u></u>=C2=A0<u></u></p>
</div>
<div>
<p class=3D"MsoNormal" style=3D"margin-bottom:12pt">Alan<u></u><u></u></p>
</div>
<p class=3D"MsoNormal"><u></u>=C2=A0<u></u></p>
<div>
<div>
<p class=3D"MsoNormal">On Thu, Sep 29, 2022 at 4:46 PM Bob Spidell &lt;<a h=
ref=3D"mailto:bspidell@comcast.net"; target=3D"_blank" rel=3D"noreferrer">bs=
pidell@comcast.net</a>&gt; wrote:<u></u><u></u></p>
</div>
<blockquote style=3D"border-top:none;border-right:none;border-bottom:none;b=
order-left:1pt solid rgb(204,204,204);padding:0in 0in 0in 6pt;margin-left:4=
.8pt;margin-right:0in">
<div>
<p class=3D"MsoNormal" style=3D"margin-bottom:12pt">re: &quot;... I don=E2=
=80=99t recall if that wire is separate from the distributor wire ...&quot;=
<br>
<br>
It is (or should be). If the battery switch is in the &#39;OFF&#39; positio=
n it grounds the coil primary so no spark.<br>
<br>
<u></u><u></u></p>
<div>
<p class=3D"MsoNormal">On 9/28/2022 8:34 PM, Alan Seigrist wrote:<u></u><u>=
</u></p>
</div>
<blockquote style=3D"margin-top:5pt;margin-bottom:5pt">
<div>
<p class=3D"MsoNormal">Hi Michael -<u></u><u></u></p>
</div>
<div>
<p class=3D"MsoNormal"><u></u>=C2=A0<u></u></p>
</div>
<div>
<p class=3D"MsoNormal">Have you tried cycling the connections on the white =
wire from the ignition switch to the coil, and also from the coil to the di=
stributor.<u></u><u></u></p>
</div>
<div>
<p class=3D"MsoNormal"><u></u>=C2=A0<u></u></p>
</div>
<div>
<p class=3D"MsoNormal">You might also want to try disconnecting the black a=
nd white wire at the coil from the battery master switch - 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 yo=
u=E2=80=99ll have to disconnect it from underneath the master switch itself=
.<u></u><u></u></p>
</div>
<div>
<p class=3D"MsoNormal"><u></u>=C2=A0<u></u></p>
</div>
<div>
<p class=3D"MsoNormal">Best,<u></u><u></u></p>
</div>
<div>
<p class=3D"MsoNormal"><u></u>=C2=A0<u></u></p>
</div>
<div>
<p class=3D"MsoNormal">Alan<u></u><u></u></p>
</div>
</blockquote>
</div>
<p class=3D"MsoNormal"><u></u>=C2=A0<u></u></p>
</blockquote>
</div>
</div>
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</div>
<p class=3D"MsoNormal" style=3D"margin-right:0in;margin-bottom:12pt;margin-=
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<p class=3D"MsoNormal"><u></u>=C2=A0<u></u></p>
</div>
</div>

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