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Check the pin inside the distributor that transfers electricity from the =
coil wire to the rotor to ascertain that it is not sticking and moves up =
and down freely.
=20
John Spaur
=20
From: Healeys [mailto:healeys-bounces@autox.team.net] On Behalf Of =
Michael Salter
Sent: Wednesday, September 28, 2022 3:25 PM
To: healeys@autox.team.net
Subject: [Healeys] Austin Healey 100 Misfire Diagnosis.
=20
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.=20
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 =E2=80=A6 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 =E2=80=A6 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 =E2=80=A6 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 =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.
=20
Any ideas folks?
=20
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</o:shapelayout></xml><![endif]--></head><body lang=3DEN-US =
link=3D"#0563C1" vlink=3D"#954F72"><div class=3DWordSection1><p =
class=3DMsoNormal><span =
style=3D'font-size:11.0pt;font-family:"Calibri",sans-serif;color:#1F497D'=
>Check the pin inside the distributor that transfers electricity from =
the coil wire to the rotor to ascertain that it is not sticking and =
moves up and down freely.<o:p></o:p></span></p><p =
class=3DMsoNormal><span =
style=3D'font-size:11.0pt;font-family:"Calibri",sans-serif;color:#1F497D'=
><o:p> </o:p></span></p><p class=3DMsoNormal><span =
style=3D'font-size:11.0pt;font-family:"Calibri",sans-serif;color:#1F497D'=
>John Spaur<o:p></o:p></span></p><p class=3DMsoNormal><span =
style=3D'font-size:11.0pt;font-family:"Calibri",sans-serif;color:#1F497D'=
><o:p> </o:p></span></p><p class=3DMsoNormal><b><span =
style=3D'font-size:11.0pt;font-family:"Calibri",sans-serif'>From:</span><=
/b><span style=3D'font-size:11.0pt;font-family:"Calibri",sans-serif'> =
Healeys [mailto:healeys-bounces@autox.team.net] <b>On Behalf Of =
</b>Michael Salter<br><b>Sent:</b> Wednesday, September 28, 2022 3:25 =
PM<br><b>To:</b> healeys@autox.team.net<br><b>Subject:</b> [Healeys] =
Austin Healey 100 Misfire Diagnosis.<o:p></o:p></span></p><p =
class=3DMsoNormal><o:p> </o:p></p><div><div><p class=3DMsoNormal =
style=3D'margin-bottom:8.0pt;line-height:106%'><span =
style=3D'font-size:11.0pt;line-height:106%;font-family:"Calibri",sans-ser=
if'>This problem has plagued me for over 1000 =
miles.<o:p></o:p></span></p><p class=3DMsoNormal =
style=3D'margin-bottom:8.0pt;line-height:106%'><span =
style=3D'font-size:11.0pt;line-height:106%;font-family:"Calibri",sans-ser=
if'>Today I had to drive some 200 miles and this is how it =
went:<o:p></o:p></span></p><p class=3DMsoNormal =
style=3D'margin-bottom:8.0pt;line-height:106%'><span =
style=3D'font-size:11.0pt;line-height:106%;font-family:"Calibri",sans-ser=
if'>Starting from cold I experienced a persistent and irregular misfire. =
<o:p></o:p></span></p><p class=3DMsoNormal =
style=3D'margin-bottom:8.0pt;line-height:106%'><span =
style=3D'font-size:11.0pt;line-height:106%;font-family:"Calibri",sans-ser=
if'>Pulling the choke out made no perceivable =
difference.<o:p></o:p></span></p><p class=3DMsoNormal =
style=3D'margin-bottom:8.0pt;line-height:106%'><span =
style=3D'font-size:11.0pt;line-height:106%;font-family:"Calibri",sans-ser=
if'>Power was not much affected and the car cruised along well in top =
overdrive with just regular periods of =
misfiring.<o:p></o:p></span></p><p class=3DMsoNormal =
style=3D'margin-bottom:8.0pt;line-height:106%'><span =
style=3D'font-size:11.0pt;line-height:106%;font-family:"Calibri",sans-ser=
if'>Climbing slopes really made no difference, even when full throttle =
was applied for 10 - 15 seconds.<o:p></o:p></span></p><p =
class=3DMsoNormal style=3D'margin-bottom:8.0pt;line-height:106%'><span =
style=3D'font-size:11.0pt;line-height:106%;font-family:"Calibri",sans-ser=
if'>Misfire continued for some 90 miles with no change when the engine =
was fully heated up.<o:p></o:p></span></p><p class=3DMsoNormal =
style=3D'margin-bottom:8.0pt;line-height:106%'><span =
style=3D'font-size:11.0pt;line-height:106%;font-family:"Calibri",sans-ser=
if'>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.<o:p></o:p></span></p><p class=3DMsoNormal =
style=3D'margin-bottom:8.0pt;line-height:106%'><span =
style=3D'font-size:11.0pt;line-height:106%;font-family:"Calibri",sans-ser=
if'>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.<o:p></o:p></span></p><p class=3DMsoNormal =
style=3D'margin-bottom:8.0pt;line-height:106%'><u><span =
style=3D'font-size:11.0pt;line-height:106%;font-family:"Calibri",sans-ser=
if'> POSSIBLE CAUSES</span></u><span =
style=3D'font-size:11.0pt;line-height:106%;font-family:"Calibri",sans-ser=
if'><o:p></o:p></span></p><p class=3Dgmail-msolistparagraph =
style=3D'mso-margin-top-alt:0in;margin-right:0in;margin-bottom:0in;margin=
-left:.5in;margin-bottom:.0001pt;line-height:106%'><span =
style=3D'font-size:11.0pt;line-height:106%;font-family:"Calibri",sans-ser=
if'>1.</span><span =
style=3D'font-size:7.0pt;line-height:106%'> =
</span><span =
style=3D'font-size:11.0pt;line-height:106%;font-family:"Calibri",sans-ser=
if'>Plugs =E2=80=A6 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.<o:p></o:p></span></p><p class=3Dgmail-msolistparagraph =
style=3D'mso-margin-top-alt:0in;margin-right:0in;margin-bottom:0in;margin=
-left:5.0in;margin-bottom:.0001pt;line-height:106%'><span =
style=3D'font-size:11.0pt;line-height:106%;font-family:"Calibri",sans-ser=
if'>2.</span><span =
style=3D'font-size:7.0pt;line-height:106%'> =
</span><span =
style=3D'font-size:11.0pt;line-height:106%;font-family:"Calibri",sans-ser=
if'>Coil =E2=80=A6 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<o:p></o:p></span></p><p =
class=3Dgmail-msolistparagraph =
style=3D'mso-margin-top-alt:0in;margin-right:0in;margin-bottom:0in;margin=
-left:5.0in;margin-bottom:.0001pt;line-height:106%'><span =
style=3D'font-size:11.0pt;line-height:106%;font-family:"Calibri",sans-ser=
if'>3.</span><span =
style=3D'font-size:7.0pt;line-height:106%'> =
</span><span =
style=3D'font-size:11.0pt;line-height:106%;font-family:"Calibri",sans-ser=
if'>Points =E2=80=A6 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.<o:p></o:p></span></p><p class=3Dgmail-msolistparagraph =
style=3D'mso-margin-top-alt:0in;margin-right:0in;margin-bottom:8.0pt;marg=
in-left:.5in;line-height:106%'><span =
style=3D'font-size:11.0pt;line-height:106%;font-family:"Calibri",sans-ser=
if'>4.</span><span =
style=3D'font-size:7.0pt;line-height:106%'> =
</span><span =
style=3D'font-size:11.0pt;line-height:106%;font-family:"Calibri",sans-ser=
if'>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.<o:p></o:p></span></p><p =
class=3Dgmail-msolistparagraph =
style=3D'mso-margin-top-alt:0in;margin-right:0in;margin-bottom:8.0pt;marg=
in-left:.5in;line-height:106%'><span =
style=3D'font-size:11.0pt;line-height:106%;font-family:"Calibri",sans-ser=
if'><o:p> </o:p></span></p><p class=3Dgmail-msolistparagraph =
style=3D'mso-margin-top-alt:0in;margin-right:0in;margin-bottom:8.0pt;marg=
in-left:.5in;line-height:106%'><span =
style=3D'font-size:11.0pt;line-height:106%;font-family:"Calibri",sans-ser=
if'>Any ideas folks?<o:p></o:p></span></p><p =
class=3Dgmail-msolistparagraph =
style=3D'mso-margin-top-alt:0in;margin-right:0in;margin-bottom:8.0pt;marg=
in-left:.5in;line-height:106%'><span =
style=3D'font-size:11.0pt;line-height:106%;font-family:"Calibri",sans-ser=
if'><o:p> </o:p></span></p></div></div></div></body></html>
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