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Re: [Healeys] Austin Healey 100 Misfire Diagnosis.

To: john harper <ah100tech@gmail.com>
Subject: Re: [Healeys] Austin Healey 100 Misfire Diagnosis.
From: Alan Seigrist via Healeys <healeys@autox.team.net>
Date: Thu, 29 Sep 2022 21:09:07 +0800
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>
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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 oil 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 woul=
d
>> 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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>>
>>

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<div dir=3D"ltr">Hi John -<div><br></div><div>Yes, that was the point I was=
 trying to make, sorry if it fell through bad interpretation!=C2=A0 As Ed M=
cMahon used to say, &quot;You Are Correct Sir!&quot;</div><div><br></div><d=
iv>Cheers,</div><div><br></div><div>Alan</div></div><br><div class=3D"gmail=
_quote"><div dir=3D"ltr" class=3D"gmail_attr">On Thu, Sep 29, 2022 at 7:53 =
PM john harper &lt;<a href=3D"mailto:ah100tech@gmail.com";>ah100tech@gmail.c=
om</a>&gt; wrote:<br></div><blockquote class=3D"gmail_quote" style=3D"margi=
n:0px 0px 0px 0.8ex;border-left:1px solid rgb(204,204,204);padding-left:1ex=
"><div dir=3D"ltr">Alan<div><br></div><div>Coils can fail with heat and the=
n recover when cooled. I had one that had these symptoms and when looking c=
losely I saw that the insulating oil had run out through a very small=C2=A0=
crack in the bottom of the case.</div></div><br><div class=3D"gmail_quote">=
<div dir=3D"ltr" class=3D"gmail_attr">On Thu, 29 Sept 2022 at 10:34, Alan S=
eigrist &lt;<a href=3D"mailto:healey.nut@gmail.com"; target=3D"_blank">heale=
y.nut@gmail.com</a>&gt; wrote:<br></div><blockquote class=3D"gmail_quote" s=
tyle=3D"margin:0px 0px 0px 0.8ex;border-left:1px solid rgb(204,204,204);pad=
ding-left:1ex"><div dir=3D"ltr"><div dir=3D"ltr">Michael -<br><br>Just as a=
 follow up to my email since the symptoms seem to manifest themself=C2=A0=
=C2=A0...=C2=A0</div><div dir=3D"ltr"><ul><li>whether the car is warmed up =
or not - this typically will exclude anything related to fuel or the coil</=
li><li>whether the car is under load or not - this typically will exclude a=
nything related to fuel</li><li>whether the choke is pulled or not - this t=
ypically will exclude anything related to fuel</li><li>somewhat intermitten=
t but systematically under all conditions - suggests to me wiring / ground =
issues</li></ul><div>Given this I&#39;d check (as a priority):<br><ul><li>B=
attery Master (when these fail they will ground the coil)</li><li>primary i=
gnition wire (white) from the switch to coil (cycle the connections)</li><l=
i>motor ground straps (cycle the connections)</li><li>loose wires in the di=
zzy</li><li>loose ignition=C2=A0wires into the dizzy or spark plug</li></ul=
><div>Other things to possibly do (as secondary):</div></div><div><ul><li>r=
eplace rotor</li><li>replace dizzy cap</li></ul></div>I don&#39;t think it =
would be contacts or condensor simply because this would either be very reg=
ular=C2=A0all the time, or maybe sensitive to temp.<br><br>Best,</div><div =
dir=3D"ltr"><br></div><div>Alan<br><br></div><br><div class=3D"gmail_quote"=
><div dir=3D"ltr" class=3D"gmail_attr">On Thu, Sep 29, 2022 at 4:46 PM Bob =
Spidell &lt;<a href=3D"mailto:bspidell@comcast.net"; target=3D"_blank">bspid=
ell@comcast.net</a>&gt; wrote:<br></div><blockquote class=3D"gmail_quote" s=
tyle=3D"margin:0px 0px 0px 0.8ex;border-left:1px solid rgb(204,204,204);pad=
ding-left:1ex">
 =20
   =20
 =20
  <div>
    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; pos=
ition
    it grounds the coil primary so no spark.<br>
    <br>
    <br>
    <div>On 9/28/2022 8:34 PM, Alan Seigrist
      wrote:<br>
    </div>
    <blockquote type=3D"cite">
     =20
      <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 ignition 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 disconnecting the black
        and 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=99=
t 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 swi=
tch
        itself.</div>
      <div dir=3D"auto"><br>
      </div>
      <div dir=3D"auto">Best,</div>
      <div dir=3D"auto"><br>
      </div>
      <div dir=3D"auto">Alan</div>
      </blockquote></div><br>
</blockquote></div></div>
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