This is a multipart message in MIME format.
--===============8628573932607266701==
boundary="----=_NextPart_000_0039_01D8D37B.A4AC8F00"
Content-Language: en-ca
This is a multipart message in MIME format.
------=_NextPart_000_0039_01D8D37B.A4AC8F00
charset="utf-8"
Content-Transfer-Encoding: quoted-printable
Mike, my first thought was coil, as I have heard they can fail =
gradually. For the small amount of work it is, I=E2=80=99d swap it out =
and see if it makes a difference if for no other reason than to =
eliminate that possibility.
=20
Best, Mirek
=20
From: Healeys <healeys-bounces@autox.team.net> On Behalf Of Michael =
Salter
Sent: September 28, 2022 6:25 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
------=_NextPart_000_0039_01D8D37B.A4AC8F00
charset="utf-8"
Content-Transfer-Encoding: quoted-printable
<html xmlns:v=3D"urn:schemas-microsoft-com:vml" =
xmlns:o=3D"urn:schemas-microsoft-com:office:office" =
xmlns:w=3D"urn:schemas-microsoft-com:office:word" =
xmlns:m=3D"http://schemas.microsoft.com/office/2004/12/omml"; =
xmlns=3D"http://www.w3.org/TR/REC-html40";><head><meta =
http-equiv=3DContent-Type content=3D"text/html; charset=3Dutf-8"><meta =
name=3DGenerator content=3D"Microsoft Word 15 (filtered =
medium)"><style><!--
/* Font Definitions */
@font-face
{font-family:"Cambria Math";
panose-1:2 4 5 3 5 4 6 3 2 4;}
@font-face
{font-family:Calibri;
panose-1:2 15 5 2 2 2 4 3 2 4;}
/* Style Definitions */
p.MsoNormal, li.MsoNormal, div.MsoNormal
{margin:0cm;
font-size:11.0pt;
font-family:"Calibri",sans-serif;}
p.gmail-msolistparagraph, li.gmail-msolistparagraph, =
div.gmail-msolistparagraph
{mso-style-name:gmail-msolistparagraph;
mso-margin-top-alt:auto;
margin-right:0cm;
mso-margin-bottom-alt:auto;
margin-left:0cm;
font-size:11.0pt;
font-family:"Calibri",sans-serif;}
span.EmailStyle19
{mso-style-type:personal-reply;
font-family:"Calibri",sans-serif;
color:windowtext;}
.MsoChpDefault
{mso-style-type:export-only;
font-family:"Calibri",sans-serif;
mso-fareast-language:EN-US;}
@page WordSection1
{size:612.0pt 792.0pt;
margin:72.0pt 72.0pt 72.0pt 72.0pt;}
div.WordSection1
{page:WordSection1;}
--></style><!--[if gte mso 9]><xml>
<o:shapedefaults v:ext=3D"edit" spidmax=3D"1026" />
</xml><![endif]--><!--[if gte mso 9]><xml>
<o:shapelayout v:ext=3D"edit">
<o:idmap v:ext=3D"edit" data=3D"1" />
</o:shapelayout></xml><![endif]--></head><body lang=3DEN-CA link=3Dblue =
vlink=3Dpurple style=3D'word-wrap:break-word'><div =
class=3DWordSection1><p class=3DMsoNormal><span =
style=3D'mso-fareast-language:EN-US'>Mike,=C2=A0 my first thought was =
coil, as I have heard they can fail gradually.=C2=A0 For the small =
amount of work it is, I=E2=80=99d swap it out and see if it makes a =
difference if for no other reason than to eliminate that =
possibility.<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-fareast-language:EN-US'>Best, =
Mirek<o:p></o:p></span></p><p class=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;padding: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> September 28, 2022 6:25 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></div><p =
class=3DMsoNormal><o:p> </o:p></p><div><div><p class=3DMsoNormal =
style=3D'margin-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;line-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-height:106%'>Starting from cold I =
experienced a persistent and irregular misfire. <o:p></o:p></p><p =
class=3DMsoNormal style=3D'margin-bottom:8.0pt;line-height: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%'>Power =
was not much affected and the car cruised along well in top overdrive =
with just regular periods of misfiring.<o:p></o:p></p><p =
class=3DMsoNormal =
style=3D'margin-bottom:8.0pt;line-height:106%'>Climbing slopes really =
made no 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 fully heated =
up.<o:p></o:p></p><p class=3DMsoNormal =
style=3D'margin-bottom:8.0pt;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 throttle settings.<o:p></o:p></p><p =
class=3DMsoNormal style=3D'margin-bottom:8.0pt;line-height:106%'>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></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:36.0pt;line-height:106%'>1.<span =
style=3D'font-size:7.0pt;line-height:106%;font-family:"Times New =
Roman",serif'> </span>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></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 =
style=3D'font-size:7.0pt;line-height:106%;font-family:"Times New =
Roman",serif'> </span>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></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%'>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 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></p><p =
class=3Dgmail-msolistparagraph =
style=3D'mso-margin-top-alt:0cm;margin-right:0cm;margin-bottom:8.0pt;marg=
in-left:36.0pt;line-height:106%'>4.<span =
style=3D'font-size:7.0pt;line-height:106%;font-family:"Times New =
Roman",serif'> </span>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></p><p =
class=3Dgmail-msolistparagraph =
style=3D'mso-margin-top-alt:0cm;margin-right:0cm;margin-bottom:8.0pt;marg=
in-left:36.0pt;line-height:106%'><o:p> </o:p></p><p =
class=3Dgmail-msolistparagraph =
style=3D'mso-margin-top-alt:0cm;margin-right:0cm;margin-bottom:8.0pt;marg=
in-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;marg=
in-left:36.0pt;line-height:106%'><o:p> </o:p></p></div></div></div><=
/body></html>
------=_NextPart_000_0039_01D8D37B.A4AC8F00--
--===============8628573932607266701==
Content-Transfer-Encoding: 7bit
Content-Disposition: inline
_______________________________________________
Archive: http://www.team.net/pipermail/healeys
http://autox.team.net/archive/healeys
Healeys@autox.team.net
http://autox.team.net/mailman/listinfo/healeys
--===============8628573932607266701==--
|