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Hello Mike
I had a similar situation in the BN3.
Tuned and reset everything multiple times and it just wouldn=E2=80=99t go a=
way.
After some weeks, eventually tracked the problem to the modern inline fuel =
filter that I had installed. Went back to how it left the Donald Healey Mot=
or Company and problem disappeared.
Hoo Roo
Patrick Quinn
Blue Mountains, Australia
From: Healeys <healeys-bounces@autox.team.net> On Behalf Of Michael Salter
Sent: Thursday, 29 September 2022 8:25 AM
To: healeys@autox.team.net
Subject: [Healeys] Austin Healey 100 Misfire Diagnosis.
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 appl=
ied for 10 - 15 seconds.
Misfire continued for some 90 miles with no change when the engine was full=
y 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 q=
uite evident that the misfire had disappeared almost completely and remaine=
d that way for at least 80 miles after which it started to misfire just a l=
ittle 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 m=
isfiring 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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</o:shapelayout></xml><![endif]--></head><body lang=3DEN-AU link=3D"#0563C1=
" vlink=3D"#954F72" style=3D'word-wrap:break-word'><div class=3DWordSection=
1><p class=3DMsoNormal><span style=3D'mso-fareast-language:EN-US'>Hello Mik=
e<o:p></o:p></span></p><p class=3DMsoNormal><span style=3D'mso-fareast-lang=
uage:EN-US'><o:p> </o:p></span></p><p class=3DMsoNormal><span style=3D=
'mso-fareast-language:EN-US'>I had a similar situation in the BN3.<o:p></o:=
p></span></p><p class=3DMsoNormal><span style=3D'mso-fareast-language:EN-US=
'><o:p> </o:p></span></p><p class=3DMsoNormal><span style=3D'mso-farea=
st-language:EN-US'>Tuned and reset everything multiple times and it just wo=
uldn=E2=80=99t go away.<o:p></o:p></span></p><p class=3DMsoNormal><span sty=
le=3D'mso-fareast-language:EN-US'><o:p> </o:p></span></p><p class=3DMs=
oNormal><span style=3D'mso-fareast-language:EN-US'>After some weeks, eventu=
ally tracked the problem to the modern inline fuel filter that I had instal=
led. Went back to how it left the Donald Healey Motor Company and problem d=
isappeared.<o:p></o:p></span></p><p class=3DMsoNormal><span style=3D'mso-fa=
reast-language:EN-US'><o:p> </o:p></span></p><p class=3DMsoNormal><spa=
n style=3D'mso-fareast-language:EN-US'>Hoo Roo<o:p></o:p></span></p><p clas=
s=3DMsoNormal><span style=3D'mso-fareast-language:EN-US'><o:p> </o:p><=
/span></p><p class=3DMsoNormal><span style=3D'mso-fareast-language:EN-US'>P=
atrick Quinn<o:p></o:p></span></p><p class=3DMsoNormal><span style=3D'mso-f=
areast-language:EN-US'>Blue Mountains, Australia<o:p></o:p></span></p><p cl=
ass=3DMsoNormal><span style=3D'mso-fareast-language:EN-US'><o:p> </o:p=
></span></p><div style=3D'border:none;border-top:solid #E1E1E1 1.0pt;paddin=
g:3.0pt 0cm 0cm 0cm'><p class=3DMsoNormal><b><span lang=3DEN-US>From:</span=
></b><span lang=3DEN-US> Healeys <healeys-bounces@autox.team.net> <b>=
On Behalf Of </b>Michael Salter<br><b>Sent:</b> Thursday, 29 September 2022=
8:25 AM<br><b>To:</b> healeys@autox.team.net<br><b>Subject:</b> [Healeys] =
Austin Healey 100 Misfire Diagnosis.<o:p></o:p></span></p></div><p class=3D=
MsoNormal><o:p> </o:p></p><div><div><p class=3DMsoNormal style=3D'marg=
in-bottom:8.0pt;line-height:106%'>This problem has plagued me for over 1000=
miles.<o:p></o:p></p><p class=3DMsoNormal style=3D'margin-bottom:8.0pt;lin=
e-height:106%'>Today I had to drive some 200 miles and this is how it went:=
<o:p></o:p></p><p class=3DMsoNormal style=3D'margin-bottom:8.0pt;line-heigh=
t:106%'>Starting from cold I experienced a persistent and irregular misfire=
=2E <o:p></o:p></p><p class=3DMsoNormal style=3D'margin-bottom:8.0pt;line-h=
eight:106%'>Pulling the choke out made no perceivable difference.<o:p></o:p=
></p><p class=3DMsoNormal style=3D'margin-bottom:8.0pt;line-height:106%'>Po=
wer was not much affected and the car cruised along well in top overdrive w=
ith just regular periods of misfiring.<o:p></o:p></p><p class=3DMsoNormal s=
tyle=3D'margin-bottom:8.0pt;line-height:106%'>Climbing slopes really made n=
o difference, even when full throttle was applied for 10 - 15 seconds.<o:p>=
</o:p></p><p class=3DMsoNormal style=3D'margin-bottom:8.0pt;line-height:106=
%'>Misfire continued for some 90 miles with no change when the engine was f=
ully heated up.<o:p></o:p></p><p class=3DMsoNormal style=3D'margin-bottom:8=
=2E0pt;line-height:106%'>I could really do nothing to influence the rate of=
the misfire although it did seem to be slightly less evident at low thrott=
le settings.<o:p></o:p></p><p class=3DMsoNormal style=3D'margin-bottom:8.0p=
t;line-height:106%'>After 90 miles I stopped briefly to get fuel and upon s=
tarting 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 misfire just a little as I came to the end of the trip.<o:p></o:p></p><=
p class=3DMsoNormal style=3D'margin-bottom:8.0pt;line-height:106%'><u> =
;POSSIBLE CAUSES</u><o:p></o:p></p><p class=3Dgmail-msolistparagraph style=
=3D'mso-margin-top-alt:0cm;margin-right:0cm;margin-bottom:0cm;margin-left:3=
6.0pt;line-height:106%'>1.<span style=3D'font-size:7.0pt;line-height:106%;f=
ont-family:"Times New Roman",serif'> </span>P=
lugs =E2=80=A6 not like a bad plug. The misfire seems to be more than 1 cyl=
inder and never came close to being the regular beat that 1 plug misfiring =
produces. All the plugs have a healthy brown/ grey appearance.<o:p></o:p></=
p><p class=3Dgmail-msolistparagraph style=3D'mso-margin-top-alt:0cm;margin-=
right:0cm;margin-bottom:0cm;margin-left:36.0pt;line-height:106%'>2.<span st=
yle=3D'font-size:7.0pt;line-height:106%;font-family:"Times New Roman",serif=
'> </span>Coil =E2=80=A6 In my experien=
ce 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<o:p></o:p></p><p cl=
ass=3Dgmail-msolistparagraph style=3D'mso-margin-top-alt:0cm;margin-right:0=
cm;margin-bottom:0cm;margin-left:36.0pt;line-height:106%'>3.<span style=3D'=
font-size:7.0pt;line-height:106%;font-family:"Times New Roman",serif'> =
; </span>Points =E2=80=A6 a possibility but the dwe=
ll is set at exactly 60 degrees and does not waver at all when the engine i=
s running in the shop.<o:p></o:p></p><p class=3Dgmail-msolistparagraph styl=
e=3D'mso-margin-top-alt:0cm;margin-right:0cm;margin-bottom:8.0pt;margin-lef=
t:36.0pt;line-height:106%'>4.<span style=3D'font-size:7.0pt;line-height:106=
%;font-family:"Times New Roman",serif'> </spa=
n>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 wo=
rse when the demand for fuel increased, as in climbing a hill of full throt=
tle. This was absolutely not the case.<o:p></o:p></p><p class=3Dgmail-msoli=
stparagraph style=3D'mso-margin-top-alt:0cm;margin-right:0cm;margin-bottom:=
8.0pt;margin-left:36.0pt;line-height:106%'><o:p> </o:p></p><p class=3D=
gmail-msolistparagraph style=3D'mso-margin-top-alt:0cm;margin-right:0cm;mar=
gin-bottom:8.0pt;margin-left:36.0pt;line-height:106%'>Any ideas folks?<o:p>=
</o:p></p><p class=3Dgmail-msolistparagraph style=3D'mso-margin-top-alt:0cm=
;margin-right:0cm;margin-bottom:8.0pt;margin-left:36.0pt;line-height:106%'>=
<o:p> </o:p></p></div></div></div><div id=3D"DAB4FAD8-2DD7-40BB-A1B8-4=
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