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this is a longshot, but the symptoms might support it. Have you considered t=
hat the gap on one of the exhaust valves is too wide? Gap settings can chang=
e on one as you adjust the next. The reason I'm thinking about this is your c=
omment about the start then stall and also the miss and especially the backf=
ire out the carb. An overgapped exhaust valve would cause chamber pressure o=
n one cylinder to build up and burp back out into the intake manifold as oth=
er cylinders are trying to inhale. If this theory is correct then that would=
interfere with the mixture going into other cylinders causing no fire or in=
termittent firing. It could also explain the backfire out the carb if the ex=
haust valve is not opening until well after the moment of combustion on the o=
vergapped cylinder.=20
Just a theory and not advice, for sure as I'm a fellow tinkerer.
Rich Sanders=20
BMCU expat currently serving time with Minnesota Triumphs
Sent from my iPad
On Oct 18, 2011, at 9:49 AM, DUFF LAWSON <duff_lawson@msn.com> wrote:
>=20
>=20
> Date: Thu, 13 Oct 2011 17:45:35 -0700
> From: sabner@yahoo.com
> Subject: MGB Owner Needs Help
> To: duff_lawson@msn.com
>=20
> Hey Duff, would you please forward this to team? I'm having problems with=
my MGBGT, and I'm totally out of ideas. Let me recap: My MG hasn't been d=
riven much this year due to health problems (mine), and when I took it in fo=
r inspection and emissions testing, it failed the idle part of the test, too=
much HC. Now when I fired it up to take it for testing in August, it fired=
right up and ran great. I'm thinking maybe I didn't get it warmed up well e=
nough before they put the probe in tail pipe. But recently, as my physical p=
roblems have abated, I've replace the spark plugs, one at a time, changed th=
e oil and filter, checked the timing and adjusted the valves. After all tha=
t, it did start briefly, but immediately died. After much cranking it resta=
rted, but it had ahuge miss and backfire. I checked that I still ahd correc=
t firing order and distributor rotation, and all of that is okay. I replace=
d the coil, and now I get a strong blue spark that will jump a 3/8" gap from=
the spark plug end of all the spark plug wires, so the spark is good. I ch=
ecked spark through my new spark plugs, and it was yellow and feeble, so I b=
ought some more (better) spark plugs. But it still won't start. It does ge=
t an occasional pop back through the carbs. I'm out of ideas; does someone h=
ave a suggestion? Now that my health is returning, I'm going back to work a=
nd I need the car for my daily driver. If anyone has any suggestions, pleas=
e let me know at sabner@yahoo.com.
> Thank you very much in advance, I appreciate any suggestions.
> _______________________________________________
> Bmcu@autox.team.net
> Donate: http://www.team.net/donate.html
> Archive: http://www.team.net/archive
> Forums: http://www.team.net/forums
> Unsubscribe/Manage: http://autox.team.net/mailman/options/bmcu/juricube@co=
mcast.net
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<html><body bgcolor=3D"#FFFFFF"><div>this is a longshot, but the symptoms mi=
ght support it. Have you considered that the gap on one of the exhaust valve=
s is too wide? Gap settings can change on one as you adjust the next. The re=
ason I'm thinking about this is your comment about the start then stall and a=
lso the miss and especially the backfire out the carb. An overgapped exhaust=
valve would cause chamber pressure on one cylinder to build up and burp bac=
k out into the intake manifold as other cylinders are trying to inhale. If t=
his theory is correct then that would interfere with the mixture going into o=
ther cylinders causing no fire or intermittent firing. It could also explain=
the backfire out the carb if the exhaust valve is not opening until well af=
ter the moment of combustion on the overgapped cylinder. </div><div><br=
></div><div>Just a theory and not advice, for sure as I'm a fellow tinkerer.=
</div><div><br></div><div>Rich Sanders </div><div>BMCU expat currently s=
erving time with Minnesota Triumphs</div><div><br></div><div><br></div><div>=
<br>Sent from my iPad</div><div><br>On Oct 18, 2011, at 9:49 AM, DUFF LAWSON=
<<a href=3D"mailto:duff_lawson@msn.com";>duff_lawson@msn.com</a>> wrot=
e:<br><br></div><div></div><blockquote type=3D"cite"><div><div dir=3D"ltr">
<br><br><div><hr id=3D"stopSpelling">Date: Thu, 13 Oct 2011 17:45:35 -0700<b=
r>From: <a href=3D"mailto:sabner@yahoo.com";><a href=3D"mailto:sabner@yahoo.c=
om">sabner@yahoo.com</a></a><br>Subject: MGB Owner Needs Help<br>To: <a href=
=3D"mailto:duff_lawson@msn.com";><a href=3D"mailto:duff_lawson@msn.com";>duff_=
lawson@msn.com</a></a><br><br><div style=3D"color:#000;background-color:#fff=
;font-family:times new roman, new york, times, serif;font-size:12pt"><div>He=
y Duff, would you please forward this to team? I'm having problems wit=
h my MGBGT, and I'm totally out of ideas. Let me recap: My MG ha=
sn't been driven much this year due to health problems (mine), and when I to=
ok it in for inspection and emissions testing, it failed the idle part of th=
e test, too much HC. Now when I fired it up to take it for testing in A=
ugust, it fired right up and ran great. I'm thinking maybe I didn't ge=
t it warmed up well enough before they put the probe in tail pipe. But=
recently, as my physical problems have abated, I've replace the spark plugs=
, one at a time, changed the oil and filter, checked the timing and adjusted=
the valves. After all that, it did start briefly, but immediately die=
d. After much cranking it restarted, but it had ahuge miss and
backfire. I checked that I still ahd correct firing order and distrib=
utor rotation, and all of that is okay. I replaced the coil, and now I=
get a strong blue spark that will jump a 3/8" gap from the spark plug end o=
f all the spark plug wires, so the spark is good. I checked spark thro=
ugh my new spark plugs, and it was yellow and feeble, so I bought some more (=
better) spark plugs. But it still won't start. It does get an oc=
casional pop back through the carbs. I'm out of ideas; does someone ha=
ve a suggestion? Now that my health is returning, I'm going back to wo=
rk and I need the car for my daily driver. If anyone has any suggestio=
ns, please let me know at <a href=3D"mailto:sabner@yahoo.com";><a href=3D"mai=
lto:sabner@yahoo.com">sabner@yahoo.com</a></a>.</div><div>Thank you very muc=
h in advance, I appreciate any suggestions.</div></div></div> =
</div>
</div></blockquote><blockquote type=3D"cite"><div><span>____________________=
___________________________</span><br><span><a href=3D"mailto:Bmcu@autox.tea=
m.net">Bmcu@autox.team.net</a></span><br><span>Donate: <a href=3D"http://www=
.team.net/donate.html"><a href=3D"http://www.team.net/donate.html";>http://ww=
w.team.net/donate.html</a></a></span><br><span>Archive: <a href=3D"http://ww=
w.team.net/archive"><a href=3D"http://www.team.net/archive";>http://www.team.=
net/archive</a></a></span><br><span>Forums: <a href=3D"http://www.team.net/f=
orums"><a href=3D"http://www.team.net/forums";>http://www.team.net/forums</a>=
</a></span><br><span>Unsubscribe/Manage: <a href=3D"http://autox.team.net/ma=
ilman/options/bmcu/juricube@comcast.net"><a href=3D"http://autox.team.net/ma=
ilman/options/bmcu/juricube@comcast.net">http://autox.team.net/mailman/optio=
ns/bmcu/juricube@comcast.net</a></a></span><br></div></blockquote></body></h=
tml>=
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_______________________________________________
Bmcu@autox.team.net
Donate: http://www.team.net/donate.html
Archive: http://www.team.net/archive
Forums: http://www.team.net/forums
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