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Re: [Healeys] Austin Healey 100 Misfire Diagnosis.

from [Bob Spidell] [Permanent Link][Original]
To: healeys@autox.team.net
Subject: Re: [Healeys] Austin Healey 100 Misfire Diagnosis.
From: Bob Spidell <bspidell@comcast.net>
Date: Thu, 29 Sep 2022 01:31:16 -0700
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>
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re: "... I donâ??t recall if that wire is separate from the distributor 
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 
> the coil from the battery master switch - if itâ??s failing youâ??ll get 
> weird symptoms like this.  If that wire is disconnected the car should 
> run no problem.  I donâ??t recall if that wire is separate from the 
> distributor wire, if it isnâ??t youâ??ll have to disconnect it from 
> underneath the master switch itself.
>
> Best,
>
> Alan
>
> On Thu, 29 Sep 2022 at 6:47 AM Michael Salter 
> <michaelsalter@gmail.com> wrote:
>
>     **
>
>     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 â?¦ not like a bad plug. The misfire seems to be more than 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 â?¦In my experience coils are very reliable but when they do
>     fail they tend to fail as they warm up and the problem gets worse
>     as the coil warms up
>
>     3.Points â?¦ 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.
>
>     4.Fuel pump â?¦ 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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    re: "... I donâ??t recall if that wire is separate from the
    distributor wire ..."<br>
    <br>
    It is (or should be). If the battery switch is in the 'OFF' position
    it grounds the coil primary so no spark.<br>
    <br>
    <br>
    <div class="moz-cite-prefix">On 9/28/2022 8:34 PM, Alan Seigrist
      wrote:<br>
    </div>
    <blockquote type="cite"
cite="mid:CAFBXTkK57aopOM4-+8+-59CHyryiQk_OO4i_jVW5+v-pGFvAbA@mail.gmail.com">
      <meta http-equiv="content-type" content="text/html; charset=UTF-8">
      <div dir="auto">Hi Michael -</div>
      <div dir="auto"><br>
      </div>
      <div dir="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="auto"><br>
      </div>
      <div dir="auto">You might also want to try disconnecting the black
        and white wire at the coil from the battery master switch - if
        itâ??s failing youâ??ll get weird symptoms like this.  If that wire
        is disconnected the car should run no problem.  I donâ??t recall
        if that wire is separate from the distributor wire, if it isnâ??t
        youâ??ll have to disconnect it from underneath the master switch
        itself.</div>
      <div dir="auto"><br>
      </div>
      <div dir="auto">Best,</div>
      <div dir="auto"><br>
      </div>
      <div dir="auto">Alan</div>
      <div><br>
        <div class="gmail_quote">
          <div dir="ltr" class="gmail_attr">On Thu, 29 Sep 2022 at 6:47
            AM Michael Salter &lt;<a
              href="mailto:michaelsalter@gmail.com";
              moz-do-not-send="true" 
class="moz-txt-link-freetext">michaelsalter@gmail.com</a>&gt;
            wrote:<br>
          </div>
          <blockquote class="gmail_quote" style="margin:0px 0px 0px
0.8ex;border-left-width:1px;border-left-style:solid;padding-left:1ex;border-left-color:rgb(204,204,204)">
            <div dir="ltr">
              <div class="gmail_default"
                style="font-family:arial,sans-serif;font-size:small">
                <p class="MsoNormal" style="text-align:center;margin:0in
                  0in
                  
8pt;line-height:107%;font-size:11pt;font-family:Calibri,sans-serif"
                  align="center"><b
                    style="font-family:Calibri,sans-serif"><span
                      
style="font-size:18pt;line-height:107%;font-family:Calibri,sans-serif"><span
                        
style="font-family:Calibri,sans-serif"></span></span></b></p>
                <p class="MsoNormal" style="margin:0in 0in
                  
8pt;line-height:107%;font-size:11pt;font-family:Calibri,sans-serif">This
                  problem has plagued me for over 1000 miles.<span
                    style="font-family:Calibri,sans-serif"></span></p>
                <p class="MsoNormal" style="margin:0in 0in
                  
8pt;line-height:107%;font-size:11pt;font-family:Calibri,sans-serif">Today
                  I had to drive some 200 miles and this is how it went:<span
                    style="font-family:Calibri,sans-serif"></span></p>
                <p class="MsoNormal" style="margin:0in 0in
                  
8pt;line-height:107%;font-size:11pt;font-family:Calibri,sans-serif">Starting
                  from cold I experienced a persistent and irregular
                  misfire.
                  <span style="font-family:Calibri,sans-serif"></span></p>
                <p class="MsoNormal" style="margin:0in 0in
                  
8pt;line-height:107%;font-size:11pt;font-family:Calibri,sans-serif">Pulling
                  the choke out made no perceivable difference.<span
                    style="font-family:Calibri,sans-serif"></span></p>
                <p class="MsoNormal" style="margin:0in 0in
                  
8pt;line-height:107%;font-size:11pt;font-family:Calibri,sans-serif">Power
                  was not much affected and the car cruised along well
                  in top overdrive with just regular periods of
                  misfiring.<span 
style="font-family:Calibri,sans-serif"></span></p>
                <p class="MsoNormal" style="margin:0in 0in
                  
8pt;line-height:107%;font-size:11pt;font-family:Calibri,sans-serif">Climbing
                  slopes really made no difference, even when full
                  throttle was applied for 10 - 15 seconds.<span
                    style="font-family:Calibri,sans-serif"></span></p>
                <p class="MsoNormal" style="margin:0in 0in
                  
8pt;line-height:107%;font-size:11pt;font-family:Calibri,sans-serif">Misfire
                  continued for some 90 miles with no change when the
                  engine was fully heated up.<span
                    style="font-family:Calibri,sans-serif"></span></p>
                <p class="MsoNormal" style="margin:0in 0in
                  
8pt;line-height:107%;font-size:11pt;font-family:Calibri,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 
style="font-family:Calibri,sans-serif"></span></p>
                <p class="MsoNormal" style="margin:0in 0in
                  
8pt;line-height:107%;font-size:11pt;font-family:Calibri,sans-serif">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.<span
                    style="font-family:Calibri,sans-serif"></span></p>
                <p class="MsoNormal" style="margin:0in 0in
                  
8pt;line-height:107%;font-size:11pt;font-family:Calibri,sans-serif"><u
                    style="font-family:Calibri,sans-serif"><span
                      style="font-family:Calibri,sans-serif"> </span>POSSIBLE
                    CAUSES</u><span
                    style="font-family:Calibri,sans-serif"></span></p>
                <p style="margin:0in 0in 0in
                  
0.5in;line-height:107%;font-size:11pt;font-family:Calibri,sans-serif"><span
                    style="font-family:Calibri,sans-serif"><span
                      style="font-family:Calibri,sans-serif">1.<span
style="font-style:normal;font-variant-caps:normal;font-weight:normal;font-stretch:normal;font-size:7pt;line-height:normal;font-family:&quot;Times
                        New Roman&quot;">     
                      </span></span></span>Plugs â?¦ not like a bad plug.
                  The misfire seems
                  to be more than 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.<span
                    style="font-family:Calibri,sans-serif"></span></p>
                <p style="margin:0in 0in 0in
                  
0.5in;line-height:107%;font-size:11pt;font-family:Calibri,sans-serif"><span
                    style="font-family:Calibri,sans-serif"><span
                      style="font-family:Calibri,sans-serif">2.<span
style="font-style:normal;font-variant-caps:normal;font-weight:normal;font-stretch:normal;font-size:7pt;line-height:normal;font-family:&quot;Times
                        New Roman&quot;">     
                      </span></span></span>Coil â?¦<span
                    style="font-family:Calibri,sans-serif">  </span>In
                  my experience coils are very reliable but when they do
                  fail they tend to fail
                  as they warm up and the problem gets worse as the coil
                  warms up<span 
style="font-family:Calibri,sans-serif"></span></p>
                <p style="margin:0in 0in 0in
                  
0.5in;line-height:107%;font-size:11pt;font-family:Calibri,sans-serif"><span
                    style="font-family:Calibri,sans-serif"><span
                      style="font-family:Calibri,sans-serif">3.<span
style="font-style:normal;font-variant-caps:normal;font-weight:normal;font-stretch:normal;font-size:7pt;line-height:normal;font-family:&quot;Times
                        New Roman&quot;">     
                      </span></span></span>Points â?¦ 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 style="font-family:Calibri,sans-serif"></span></p>
                <p style="margin:0in 0in 8pt
                  
0.5in;line-height:107%;font-size:11pt;font-family:Calibri,sans-serif"><span
                    style="font-family:Calibri,sans-serif"><span
                      style="font-family:Calibri,sans-serif">4.<span
style="font-style:normal;font-variant-caps:normal;font-weight:normal;font-stretch:normal;font-size:7pt;line-height:normal;font-family:&quot;Times
                        New Roman&quot;">     
                      </span></span></span>Fuel pump â?¦ 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.</p>
                <p style="margin:0in 0in 8pt
                  
0.5in;line-height:107%;font-size:11pt;font-family:Calibri,sans-serif"><br>
                </p>
                <p style="margin:0in 0in 8pt
                  
0.5in;line-height:107%;font-size:11pt;font-family:Calibri,sans-serif">Any
                  ideas folks?<br>
                </p>
                <p style="margin:0in 0in 8pt
                  
0.5in;line-height:107%;font-size:11pt;font-family:Calibri,sans-serif"><br>
                </p>
              </div>
            </div>
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