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Re: [Healeys] Austin Healey 100 Misfire Diagnosis.

To: Michael Salter <michaelsalter@gmail.com>, Alan Seigrist <healey.nut@gmail.com>
Subject: Re: [Healeys] Austin Healey 100 Misfire Diagnosis.
From: WILLIAM B LAWRENCE via Healeys <healeys@autox.team.net>
Date: Fri, 30 Sep 2022 03:55:39 +0000
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Thread-topic: [Healeys] Austin Healey 100 Misfire Diagnosis.
--===============2953869653019419926==
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Content-Transfer-Encoding: quoted-printable

Check for a pin hole in the fuel pickup tube.

Bill Lawrence
BN1#554
________________________________
From: Healeys <healeys-bounces@autox.team.net> on behalf of Michael Salter =
<michaelsalter@gmail.com>
Sent: Friday, September 30, 2022 2:01 AM
To: Alan Seigrist <healey.nut@gmail.com>
Cc: Healey list <healeys@autox.team.net>
Subject: Re: [Healeys] Austin Healey 100 Misfire Diagnosis.

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 h=
erring" although it certainly is an odd one.

On Thu., Sep. 29, 2022, 9:23 p.m. Alan Seigrist, <healey.nut@gmail.com<mail=
to:healey.nut@gmail.com>> wrote:
Good point.  I had a very similar experience when I had mistakenly used hig=
h heat silicone to seal the fuel tank sender, and I didn=92t know 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<mail=
to:michael.oritt@gmail.com>> wrote:
I had a similar miss that was caused by a leaf that had gotten into the tan=
k.  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 either got o=
ff the gas pedal or shut the engine down the leaf would apparently fall awa=
y from the pickup and everything would be fine until the leaf was once agai=
n pulled against the pickup, etc. etc.

I empirically came up with this theory after I pulled the fuel sender, sear=
ched around in the tank with a flashlight and found the leaf, and after I r=
emoved it the miss went away.  How the leaf got into the tank when the 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.te=

I suspect that when the tank is filled any sediment or debris around the ta=
nk intake is redistributed thru the fuel then it settles again.  Classic si=
gn of bad fuel filter or sediment in tank.

Don





Sent from Mail<https://go.microsoft.com/fwlink/?LinkId=3D550986> for Window=
s



Sent: Thursday, September 29, 2022 8:10 AM
Subject: Re: [Healeys] Austin Healey 100 Misfire Diagnosis.



Thanks to all who have obviously given this misfire issue considerable thou=
ght. I will be sure to check all suggestions.

I  should like to point out however that it is the immediate vanishing of t=
he 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 result of=
 filling the tank.

Furthermore I'm convinced that this is not a fuel starvation problem becaus=
e 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=

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



00tech@gmail.com>> wrote:

Alan



Coils can fail with heat and then recover when cooled. I had one that had t=
hese symptoms and when looking closely I saw that the insulating oil had ru=
n out through a very small crack in the bottom of the case.



ealey.nut@gmail.com>> wrote:

Michael -

Just as a follow up to my email since the symptoms seem to manifest themsel=
f  ...

  *   whether the car is warmed up or not - this typically will exclude any=
thing related to fuel or the coil
  *   whether the car is under load or not - this typically will exclude an=
ything related to fuel
  *   whether the choke is pulled or not - this typically will exclude anyt=
hing related to fuel
  *   somewhat intermittent but systematically under all conditions - sugge=
sts 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 conn=
ections)
  *   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 e=
ither be very regular all the time, or maybe sensitive to temp.

Best,



Alan



pidell@comcast.net>> wrote:

re: "... I don=92t recall if that wire is separate from the distributor wir=
e ..."

It is (or should be). If the battery switch is in the 'OFF' position it gro=
unds 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 co=
il from the battery master switch - if it=92s failing you=92ll get weird sy=
mptoms like this.  If that wire is disconnected the car should run no probl=
em.  I don=92t recall if that wire is separate from the distributor wire, i=
f it isn=92t you=92ll have to disconnect it from underneath the master swit=
ch itself.



Best,



Alan



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<head>
<meta http-equiv=3D"Content-Type" content=3D"text/html; charset=3DWindows-1=
252">
</head>
<body>
<div style=3D"font-family: inherit; font-size: inherit; color: inherit; bac=
kground-color: transparent;">
</div>
<div style=3D"font-family: inherit; font-size: inherit; color: inherit; bac=
kground-color: transparent;">
Check for a pin hole in the fuel pickup tube.</div>
<div style=3D"font-family: inherit; font-size: inherit; color: inherit; bac=
kground-color: transparent;">
<br>
</div>
<div style=3D"font-family: inherit; font-size: inherit; color: inherit; bac=
kground-color: transparent;">
Bill Lawrence</div>
<div style=3D"font-family: inherit; font-size: inherit; color: inherit; bac=
kground-color: transparent;">
BN1#554</div>
<hr style=3D"display:inline-block;width:98%" tabindex=3D"-1">
<div id=3D"divRplyFwdMsg" dir=3D"ltr"><font face=3D"Calibri, sans-serif" st=
yle=3D"font-size:11pt" color=3D"#000000"><b>From:</b> Healeys &lt;healeys-b=
ounces@autox.team.net&gt; on behalf of Michael Salter &lt;michaelsalter@gma=
il.com&gt;<br>
<b>Sent:</b> Friday, September 30, 2022 2:01 AM<br>
<b>To:</b> Alan Seigrist &lt;healey.nut@gmail.com&gt;<br>
<b>Cc:</b> Healey list &lt;healeys@autox.team.net&gt;<br>
<b>Subject:</b> Re: [Healeys] Austin Healey 100 Misfire Diagnosis.</font>
<div>&nbsp;</div>
</div>
<div>
<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.&nbsp;
<div dir=3D"auto">I'm starting to think that the refueling situation is som=
ething of a &quot;red herring&quot; although it certainly is an odd one.</d=
iv>
</div>
<br>
<div class=3D"x_gmail_quote">
<div dir=3D"ltr" class=3D"x_gmail_attr">On Thu., Sep. 29, 2022, 9:23 p.m. A=
lan Seigrist, &lt;<a href=3D"mailto:healey.nut@gmail.com";>healey.nut@gmail.=
com</a>&gt; wrote:<br>
</div>
<blockquote class=3D"x_gmail_quote" style=3D"margin:0 0 0 .8ex; border-left=
:1px #ccc solid; padding-left:1ex">
<div dir=3D"auto">Good point.&nbsp; I had a very similar experience when I =
had mistakenly used high heat silicone to seal the fuel tank sender, and I =
didn=92t know that fuel caused flakes of it to fall off and plug the pickup=
 intermittently.</div>
<div><br>
<div class=3D"x_gmail_quote">
<div dir=3D"ltr" class=3D"x_gmail_attr">On Fri, 30 Sep 2022 at 4:38 AM, Mic=
hael Oritt &lt;<a href=3D"mailto:michael.oritt@gmail.com"; target=3D"_blank"=
 rel=3D"noreferrer">michael.oritt@gmail.com</a>&gt; wrote:<br>
</div>
<blockquote class=3D"x_gmail_quote" style=3D"margin:0 0 0 .8ex; border-left=
:1px #ccc solid; padding-left:1ex">
<div dir=3D"ltr">
<div class=3D"x_gmail_default" style=3D"color:#3333ff">I had a similar miss=
 that was caused by a leaf that had gotten into the tank.&nbsp; 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.&nbsp;
 When I either 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 th=
e leaf was once again pulled against the pickup, etc. etc.&nbsp;</div>
<div class=3D"x_gmail_default" style=3D"color:#3333ff"><br>
</div>
<div class=3D"x_gmail_default" style=3D"color:#3333ff">I empirically came u=
p with this theory after I pulled the fuel sender, searched around in the t=
ank with a flashlight and found the leaf, and after I removed it the miss w=
ent away.&nbsp; How the leaf got into the
 tank when the fuel filler is inside the boot is a larger issue I never fig=
ured out.</div>
<div class=3D"x_gmail_default" style=3D"color:#3333ff"><br>
</div>
<div class=3D"x_gmail_default" style=3D"color:#3333ff">Best--Michael Oritt<=
/div>
<div class=3D"x_gmail_default" style=3D"color:#3333ff"><br>
</div>
</div>
<br>
<div class=3D"x_gmail_quote"></div>
<div class=3D"x_gmail_quote">
<div dir=3D"ltr" class=3D"x_gmail_attr">On Thu, Sep 29, 2022 at 11:01 AM Do=
n Anglesey via Healeys &lt;<a href=3D"mailto:healeys@autox.team.net"; target=
=3D"_blank" rel=3D"noreferrer">healeys@autox.team.net</a>&gt; wrote:<br>
</div>
</div>
<div class=3D"x_gmail_quote">
<blockquote class=3D"x_gmail_quote" style=3D"margin:0px 0px 0px 0.8ex; bord=
er-left:1px solid rgb(204,204,204); padding-left:1ex">
<div></div>
</blockquote>
</div>
<div class=3D"x_gmail_quote">
<blockquote class=3D"x_gmail_quote" style=3D"margin:0px 0px 0px 0.8ex; bord=
er-left:1px solid rgb(204,204,204); padding-left:1ex">
<div>
<div lang=3D"EN-US">
<div>
<p class=3D"x_MsoNormal">I suspect that when the tank is filled any sedimen=
t or debris around the tank intake is redistributed thru the fuel then it s=
ettles again.&nbsp; Classic sign of bad fuel filter or sediment in tank.</p=
>
<p class=3D"x_MsoNormal">Don</p>
<p class=3D"x_MsoNormal"><u></u>&nbsp;<u></u></p>
<p class=3D"x_MsoNormal"><u></u>&nbsp;<u></u></p>
<p class=3D"x_MsoNormal">Sent from <a href=3D"https://go.microsoft.com/fwli=
nk/?LinkId=3D550986" target=3D"_blank" rel=3D"noreferrer">
Mail</a> for Windows</p>
<p class=3D"x_MsoNormal"><u></u>&nbsp;<u></u></p>
<div style=3D"border-right:none; border-bottom:none; border-left:none; bord=
er-top:1pt solid rgb(225,225,225); padding:3pt 0in 0in">
<p class=3D"x_MsoNormal" style=3D"border:none; padding:0in"><b>From: </b><a=
 href=3D"mailto:michaelsalter@gmail.com"; target=3D"_blank" rel=3D"noreferre=
r">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"x_MsoNormal"><u></u>&nbsp;<u></u></p>
<div>
<p class=3D"x_MsoNormal">Thanks to all who have obviously given this misfir=
e issue considerable thought. I will be sure to check all suggestions.&nbsp=
;<u></u><u></u></p>
<div>
<p class=3D"x_MsoNormal">I&nbsp; should like to point out however that it i=
s the immediate vanishing of the misfire after filling the fuel tank that h=
as me confused.&nbsp;<u></u><u></u></p>
</div>
<div>
<p class=3D"x_MsoNormal">This has happened three times simce the problem ap=
peared.<u></u><u></u></p>
</div>
<div>
<p class=3D"x_MsoNormal">I just don't understand how an ignition problem co=
uld change as a result of filling the tank.<u></u><u></u></p>
</div>
<div>
<p class=3D"x_MsoNormal">Furthermore I'm convinced that this is not a fuel =
starvation problem because the amount of engine power being used has no eff=
ect.<u></u><u></u></p>
</div>
<div>
<p class=3D"x_MsoNormal">Totally baffled.<u></u><u></u></p>
</div>
<div>
<p class=3D"x_MsoNormal">Thanks again to all ... I'll&nbsp; report back.<u>=
</u><u></u></p>
</div>
</div>
<p class=3D"x_MsoNormal"><u></u>&nbsp;<u></u></p>
<div>
<div>
<p class=3D"x_MsoNormal">On Thu., Sep. 29, 2022, 9:14 a.m. Alan Seigrist vi=
a Healeys, &lt;<a href=3D"mailto:healeys@autox.team.net"; target=3D"_blank" =
rel=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=
; border-left:1pt solid rgb(204,204,204); padding:0in 0in 0in 6pt; margin-l=
eft:4.8pt; margin-right:0in">
<div>
<p class=3D"x_MsoNormal">Hi John -<u></u><u></u></p>
<div>
<p class=3D"x_MsoNormal"><u></u>&nbsp;<u></u></p>
</div>
<div>
<p class=3D"x_MsoNormal">Yes, that was the point I was trying to make, sorr=
y if it fell through bad interpretation!&nbsp; As Ed McMahon used to say, &=
quot;You Are Correct Sir!&quot;<u></u><u></u></p>
</div>
<div>
<p class=3D"x_MsoNormal"><u></u>&nbsp;<u></u></p>
</div>
<div>
<p class=3D"x_MsoNormal">Cheers,<u></u><u></u></p>
</div>
<div>
<p class=3D"x_MsoNormal"><u></u>&nbsp;<u></u></p>
</div>
<div>
<p class=3D"x_MsoNormal">Alan<u></u><u></u></p>
</div>
</div>
<p class=3D"x_MsoNormal"><u></u>&nbsp;<u></u></p>
<div>
<div>
<p class=3D"x_MsoNormal">On Thu, Sep 29, 2022 at 7:53 PM john harper &lt;<a=
 href=3D"mailto:ah100tech@gmail.com"; target=3D"_blank" rel=3D"noreferrer">a=
h100tech@gmail.com</a>&gt; wrote:<u></u><u></u></p>
</div>
<blockquote style=3D"border-top:none; border-right:none; border-bottom:none=
; border-left:1pt solid rgb(204,204,204); padding:0in 0in 0in 6pt; margin-l=
eft:4.8pt; margin-right:0in">
<div>
<p class=3D"x_MsoNormal">Alan<u></u><u></u></p>
<div>
<p class=3D"x_MsoNormal"><u></u>&nbsp;<u></u></p>
</div>
<div>
<p class=3D"x_MsoNormal">Coils can fail with heat and then recover when coo=
led. I had one that had these symptoms and when looking closely I saw that =
the insulating oil had run out through a very small&nbsp;crack in the botto=
m of the case.<u></u><u></u></p>
</div>
</div>
<p class=3D"x_MsoNormal"><u></u>&nbsp;<u></u></p>
<div>
<div>
<p class=3D"x_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"=
>healey.nut@gmail.com</a>&gt; wrote:<u></u><u></u></p>
</div>
<blockquote style=3D"border-top:none; border-right:none; border-bottom:none=
; border-left:1pt solid rgb(204,204,204); padding:0in 0in 0in 6pt; margin-l=
eft:4.8pt; margin-right:0in">
<div>
<div>
<p class=3D"x_MsoNormal">Michael -<br>
<br>
Just as a follow up to my email since the symptoms seem to manifest themsel=
f&nbsp;&nbsp;...&nbsp;<u></u><u></u></p>
</div>
<div>
<ul type=3D"disc">
<li class=3D"x_MsoNormal">whether the car is warmed up or not - this typica=
lly will exclude anything related to fuel or the coil<u></u><u></u></li><li=
 class=3D"x_MsoNormal">whether the car is under load or not - this typicall=
y will exclude anything related to fuel<u></u><u></u></li><li class=3D"x_Ms=
oNormal">whether the choke is pulled or not - this typically will exclude a=
nything related to fuel<u></u><u></u></li><li class=3D"x_MsoNormal">somewha=
t intermittent but systematically under all conditions - suggests to me wir=
ing / ground issues<u></u><u></u></li></ul>
<div>
<p class=3D"x_MsoNormal">Given this I'd check (as a priority):<u></u><u></u=
></p>
<ul type=3D"disc">
<li class=3D"x_MsoNormal">Battery Master (when these fail they will ground =
the coil)<u></u><u></u></li><li class=3D"x_MsoNormal">primary ignition wire=
 (white) from the switch to coil (cycle the connections)<u></u><u></u></li>=
<li class=3D"x_MsoNormal">motor ground straps (cycle the connections)<u></u=
><u></u></li><li class=3D"x_MsoNormal">loose wires in the dizzy<u></u><u></=
u></li><li class=3D"x_MsoNormal">loose ignition&nbsp;wires into the dizzy o=
r spark plug<u></u><u></u></li></ul>
<div>
<p class=3D"x_MsoNormal">Other things to possibly do (as secondary):<u></u>=
<u></u></p>
</div>
</div>
<div>
<ul type=3D"disc">
<li class=3D"x_MsoNormal">replace rotor<u></u><u></u></li><li class=3D"x_Ms=
oNormal">replace dizzy cap<u></u><u></u></li></ul>
</div>
<p class=3D"x_MsoNormal">I don't think it would be contacts or condensor si=
mply because this would either be very regular&nbsp;all the time, or maybe =
sensitive to temp.<br>
<br>
Best,<u></u><u></u></p>
</div>
<div>
<p class=3D"x_MsoNormal"><u></u>&nbsp;<u></u></p>
</div>
<div>
<p class=3D"x_MsoNormal" style=3D"margin-bottom:12pt">Alan<u></u><u></u></p=
>
</div>
<p class=3D"x_MsoNormal"><u></u>&nbsp;<u></u></p>
<div>
<div>
<p class=3D"x_MsoNormal">On Thu, Sep 29, 2022 at 4:46 PM Bob Spidell &lt;<a=
 href=3D"mailto:bspidell@comcast.net"; target=3D"_blank" rel=3D"noreferrer">=
bspidell@comcast.net</a>&gt; wrote:<u></u><u></u></p>
</div>
<blockquote style=3D"border-top:none; border-right:none; border-bottom:none=
; border-left:1pt solid rgb(204,204,204); padding:0in 0in 0in 6pt; margin-l=
eft:4.8pt; margin-right:0in">
<div>
<p class=3D"x_MsoNormal" style=3D"margin-bottom:12pt">re: &quot;... I don=
=92t 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 'OFF' position it gro=
unds the coil primary so no spark.<br>
<br>
<u></u><u></u></p>
<div>
<p class=3D"x_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"x_MsoNormal">Hi Michael -<u></u><u></u></p>
</div>
<div>
<p class=3D"x_MsoNormal"><u></u>&nbsp;<u></u></p>
</div>
<div>
<p class=3D"x_MsoNormal">Have you tried cycling the connections on the whit=
e wire from the ignition switch to the coil, and also from the coil to the =
distributor.<u></u><u></u></p>
</div>
<div>
<p class=3D"x_MsoNormal"><u></u>&nbsp;<u></u></p>
</div>
<div>
<p class=3D"x_MsoNormal">You might also want to try disconnecting the black=
 and white wire at the coil from the battery master switch - if it=92s fail=
ing you=92ll get weird symptoms like this.&nbsp; If that wire is disconnect=
ed the car should run no problem.&nbsp; I don=92t
 recall if that wire is separate from the distributor wire, if it isn=92t y=
ou=92ll have to disconnect it from underneath the master switch itself.<u><=
/u><u></u></p>
</div>
<div>
<p class=3D"x_MsoNormal"><u></u>&nbsp;<u></u></p>
</div>
<div>
<p class=3D"x_MsoNormal">Best,<u></u><u></u></p>
</div>
<div>
<p class=3D"x_MsoNormal"><u></u>&nbsp;<u></u></p>
</div>
<div>
<p class=3D"x_MsoNormal">Alan<u></u><u></u></p>
</div>
</blockquote>
</div>
<p class=3D"x_MsoNormal"><u></u>&nbsp;<u></u></p>
</blockquote>
</div>
</div>
<p class=3D"x_MsoNormal" style=3D"margin-bottom:12pt">_____________________=
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