Re: [Tigers] The latest problem: Surging

["Dr. T. Y. McDowell via Tigers" <tigers@autox.team.net>]

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Stu,
=20
Hoping it works out.  Keep us posted.  When Tigering, there's always someth=
ing!
=20
Tym McDowell

> On 08/31/2024 6:23 PM EDT Stu <sabre2tgr@gmail.com> wrote:
> =20
> =20
> I should have added this info at the start:  Stock 260, original carb, or=
iginal points type ignition.
> =20
> Things I've tried since my original message:
> =20
> Tightened the nuts on the carb mounting studs, and the screws that hold t=
he top on, nothing was loose
> =20
> All the electrical connections seem tight, no corrosion.
> =20
> Let the car warm up again, and it started doing it a little.
> =20
> The old carb cleaner trick:  I sprayed carb cleaner all over anything tha=
t might have a vacuum leak,carb base, hoses, and so on...  nothing happened
> =20
> With the timing light connected, I watched the advance as a couple dips h=
appened... no change, timing was right where I left it, and I could not det=
ect any missing flashes during the dip.
> =20
> And, after a few minutes, it stopped doing it.
> =20
> So that's it for today.  Tomorrow is busy, Monday I'll take it for a driv=
e and see if it's any different, or if any more clues appear.
>=20
> On Sat, Aug 31, 2024 at 4:54=E2=80=AFPM M Lafayette via Tigers <tigers@au=
tox.team.net mailto:tigers@autox.team.net> wrote:
>=20
> > I had the same symptoms years ago.  Leak in the vaccuum going to the PC=
V valve.  I'm betting that's the issue.  Or possibly a bad PCV valve, but I=
 still think it's  a bad line going to the valve.=20
> > Mark L
> >=20
> > In a message dated 8/31/2024 3:49:03 PM Eastern Daylight Time, tigers@a=
utox.team.net mailto:tigers@autox.team.net writes:
> > =20
> >=20
> > >=20
> > > I think a low float condition would not let it drive fine.
> > >=20
> > > =20
> > >=20
> > > Many conditions can contribute to idle surging so it starts with a pr=
ocess of elimination.
> > >=20
> > > =20
> > >=20
> > > Systems need to be checked =E2=80=93 air, fuel and spark =E2=80=93 lo=
ose wire connection, vacuum
> > >=20
> > > =20
> > >=20
> > > Ron Fraser
> > >=20
> > > =20
> > >=20
> > > =20
> > >=20
> > > =20
> > >=20
> > > From: Rob Hogan <robertdhogan@gmail.com mailto:robertdhogan@gmail.com=
>
> > > Sent: Saturday, August 31, 2024 3:18 PM
> > > To: Ron Fraser <rfraser@bluefrog.com mailto:rfraser@bluefrog.com>
> > > Cc: Stu <sabre2tgr@gmail.com mailto:sabre2tgr@gmail.com>; Tiger Net <=
Tigers@autox.team.net mailto:Tigers@autox.team.net>
> > > Subject: Re: [Tigers] The latest problem: Surging
> > >=20
> > > =20
> > >=20
> > > Isn't idle surging typically from a carburetor low float setting?
> > >=20
> > > =20
> > >=20
> > > On Sat, Aug 31, 2024 at 11:45=E2=80=AFAM Ron Fraser <rfraser@bluefrog=
.com mailto:rfraser@bluefrog.com> wrote:
> > >=20
> > > >=20
> > > > Stu
> > > >=20
> > > > =20
> > > >=20
> > > > Always difficult to troubleshoot remotely.
> > > >=20
> > > > =20
> > > >=20
> > > > You may have to do standard checks on all systems =E2=80=93 air, fu=
el and spark
> > > >=20
> > > > Alcohol in the fuel can tear up hoses and gaskets
> > > >=20
> > > > Check to make sure fuel filter is OK
> > > >=20
> > > > Check for vacuum leaks
> > > >=20
> > > > =20
> > > >=20
> > > > My 1st thought =E2=80=93 the fuel level is high
> > > >=20
> > > > Check the float level and check for any debris in the float bowl
> > > >=20
> > > > =20
> > > >=20
> > > > Remove the air filter and idle engine to see if it is an air flow p=
roblem.
> > > >=20
> > > > =20
> > > >=20
> > > > Hope this helps
> > > >=20
> > > > Ron Fraser
> > > >=20
> > > > =20
> > > >=20
> > > > =20
> > > >=20
> > > > From: Tigers <tigers-bounces@autox.team.net mailto:tigers-bounces@a=
utox.team.net> On Behalf Of Stu
> > > > Sent: Saturday, August 31, 2024 9:57 AM
> > > > To: Tiger Net <Tigers@autox.team.net mailto:Tigers@autox.team.net>
> > > > Subject: [Tigers] The latest problem: Surging
> > > >=20
> > > > =20
> > > >=20
> > > > Ok, so I got the vacuum advance sorted and reset the timing, etc.  =
But now there's another issue.
> > > >=20
> > > > =20
> > > >=20
> > > > The car starts and warms up normally, choke opening, temperature ga=
uge coming up to the thermostat temp, etc. But then it starts surging at id=
le.  Accelerating, driving both seem fine.  But when it goes back to idle, =
waiting at a stoplight or something, it starts having these little dips, wh=
ich soon become larger dips, to the point where it stops.  It restarts righ=
t away, then does it again.  At a stoplight I have to left foot brake so th=
at I can keep my foot on the throttle to keep it alive.  =20
> > > >=20
> > > > =20
> > > >=20
> > > > Here's a video I shot in the garage as it started to do it after wa=
rming up.  Anybody seen this before or... cured it?
> > > >=20
> > > > =20
> > > >=20
> > > > https://www.dropbox.com/scl/fo/0613ys0iegdndjhnjt5a8/AIcza8ouXqEsp5=
7qLWSlZOY?rlkey=3Ds9h2q3sal042y9z3t5oav2uwt&dl=3D0
> > > >=20
> > > > _______________________________________________
> > > >=20
> > > > tigers@autox.team.net mailto:tigers@autox.team.net
> > > >=20
> > > > Donate: http://www.team.net/donate.html
> > > > Archive: http://www.team.net/pipermail/tigers http://autox.team.net=
/archive
> > > >=20
> > > > Unsubscribe: http://autox.team.net/mailman/options/tigers/robertdho=
gan@gmail.com
> > > >=20
> > > >=20
> > > _______________________________________________
> > >=20
> > > tigers@autox.team.net mailto:tigers@autox.team.net
> > >=20
> > > Donate: http://www.team.net/donate.html
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rchive
> > >=20
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com
> > >=20
> > >=20
> > >=20
> > _______________________________________________
> >=20
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> >=20
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hive
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>=20
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<!doctype html>
<html>
 <head>=20
  <meta charset=3D"UTF-8">=20
 </head>
 <body>
  <div style=3D"font-size: 12pt; font-family: helvetica,arial,sans-serif; c=
olor: #333333;">
   <span style=3D"font-family: helvetica; font-size: 12pt;">Stu,</span>
  </div>=20
  <div class=3D"default-style" style=3D"font-size: 12pt; font-family: helve=
tica,arial,sans-serif; color: #333333;">
   &nbsp;
  </div>=20
  <div class=3D"default-style" style=3D"font-size: 12pt; font-family: helve=
tica,arial,sans-serif; color: #333333;">
   <span style=3D"font-family: helvetica; font-size: 12pt;">Hoping it works=
 out.&nbsp; Keep us posted.&nbsp; When Tigering, there's always something!<=
/span>
  </div>=20
  <div class=3D"default-style" style=3D"font-size: 12pt; font-family: helve=
tica,arial,sans-serif; color: #333333;">
   &nbsp;
  </div>=20
  <div class=3D"default-style" style=3D"font-size: 12pt; font-family: helve=
tica,arial,sans-serif; color: #333333;">
   <span style=3D"font-family: helvetica; font-size: 12pt;">Tym McDowell</s=
pan>
  </div>=20
  <blockquote type=3D"cite">=20
   <div>
    On 08/31/2024 6:23 PM EDT Stu &lt;sabre2tgr@gmail.com&gt; wrote:
   </div>=20
   <div>
    &nbsp;
   </div>=20
   <div>
    &nbsp;
   </div>=20
   <div dir=3D"ltr">=20
    <div class=3D"gmail_default" style=3D"font-size: small;">
     I should have added this info at the start:&nbsp; Stock 260, original =
carb, original points type ignition.
    </div>=20
    <div class=3D"gmail_default" style=3D"font-size: small;">
     &nbsp;
    </div>=20
    <div class=3D"gmail_default" style=3D"font-size: small;">
     Things I've tried since my original message:
    </div>=20
    <div class=3D"gmail_default" style=3D"font-size: small;">
     &nbsp;
    </div>=20
    <div class=3D"gmail_default" style=3D"font-size: small;">
     Tightened the nuts on the carb mounting studs, and the screws that hol=
d the top on, nothing was loose
    </div>=20
    <div class=3D"gmail_default" style=3D"font-size: small;">
     &nbsp;
    </div>=20
    <div class=3D"gmail_default" style=3D"font-size: small;">
     All the electrical connections seem tight, no corrosion.
    </div>=20
    <div class=3D"gmail_default" style=3D"font-size: small;">
     &nbsp;
    </div>=20
    <div class=3D"gmail_default" style=3D"font-size: small;">
     Let the car warm up again, and it started doing it a little.
    </div>=20
    <div class=3D"gmail_default" style=3D"font-size: small;">
     &nbsp;
    </div>=20
    <div class=3D"gmail_default" style=3D"font-size: small;">
     The old carb cleaner trick:&nbsp; I sprayed carb cleaner all over anyt=
hing that might have a vacuum leak,carb base, hoses, and so on...&nbsp; not=
hing happened
    </div>=20
    <div class=3D"gmail_default" style=3D"font-size: small;">
     &nbsp;
    </div>=20
    <div class=3D"gmail_default" style=3D"font-size: small;">
     With the timing light connected, I watched the advance as a couple dip=
s happened... no change, timing was right where I left it, and I could not =
detect any missing flashes during the dip.
    </div>=20
    <div class=3D"gmail_default" style=3D"font-size: small;">
     &nbsp;
    </div>=20
    <div class=3D"gmail_default" style=3D"font-size: small;">
     And, after a few minutes, it stopped doing it.
    </div>=20
    <div class=3D"gmail_default" style=3D"font-size: small;">
     &nbsp;
    </div>=20
    <div class=3D"gmail_default" style=3D"font-size: small;">
     So that's it for today.&nbsp; Tomorrow is busy, Monday I'll take it fo=
r a drive and see if it's any different, or if any more clues appear.
    </div>=20
   </div>=20
   <br>=20
   <div class=3D"gmail_quote">=20
    <div class=3D"gmail_attr" dir=3D"ltr">
     On Sat, Aug 31, 2024 at 4:54=E2=80=AFPM M Lafayette via Tigers &lt;<a =
href=3D"mailto:tigers@autox.team.net"; target=3D"_blank" rel=3D"noopener">ti=
gers@autox.team.net</a>&gt; wrote:
    </div>=20
    <blockquote>=20
     <div>=20
      <div style=3D"font-family: arial,helvetica,sans-serif; font-size: 14p=
t; color: #000000;">
       <span style=3D"color: #000000; font-style: normal; font-weight: bold=
;">I had the same symptoms years ago.&nbsp; Leak in the vaccuum going to th=
e PCV valve.&nbsp; I'm betting that's the issue.&nbsp; Or possibly a bad PC=
V valve, but I still think it's&nbsp; a bad line going to the valve.&nbsp;<=
br></span>
      </div>=20
      <div style=3D"font-family: arial,helvetica,sans-serif; font-size: 14p=
t; color: #000000;">
       <span style=3D"color: #000000; font-style: normal; font-weight: bold=
;">Mark L</span>
      </div>=20
      <br>In a message dated 8/31/2024 3:49:03 PM Eastern Daylight Time, <a=
 href=3D"mailto:tigers@autox.team.net"; target=3D"_blank" rel=3D"noopener">t=
igers@autox.team.net</a> writes:=20
      <div>
       &nbsp;
      </div>=20
      <div>=20
       <blockquote>=20
        <div id=3D"m_8009456528955968275m_8685979321128247961yiv8325011580"=
>=20
         <div>=20
          <div>=20
           <p>I think a low float condition would not let it drive fine.</p=
>=20
           <p>&nbsp;</p>=20
           <p>Many conditions can contribute to idle surging so it starts w=
ith a process of elimination.</p>=20
           <p>&nbsp;</p>=20
           <p>Systems need to be checked =E2=80=93 air, fuel and spark =E2=
=80=93 loose wire connection, vacuum</p>=20
           <p>&nbsp;</p>=20
           <p>Ron Fraser</p>=20
           <p>&nbsp;</p>=20
           <p>&nbsp;</p>=20
           <p>&nbsp;</p>=20
           <div id=3D"m_8009456528955968275m_8685979321128247961yiv83250115=
80yqt08769">=20
            <p><strong>From:</strong> Rob Hogan &lt;<a href=3D"mailto:rober=
tdhogan@gmail.com" target=3D"_blank" rel=3D"noopener">robertdhogan@gmail.co=
m</a>&gt; <br clear=3D"none"><strong>Sent:</strong> Saturday, August 31, 20=
24 3:18 PM<br clear=3D"none"><strong>To:</strong> Ron Fraser &lt;<a href=3D=
"mailto:rfraser@bluefrog.com"; target=3D"_blank" rel=3D"noopener">rfraser@bl=
uefrog.com</a>&gt;<br clear=3D"none"><strong>Cc:</strong> Stu &lt;<a href=
=3D"mailto:sabre2tgr@gmail.com"; target=3D"_blank" rel=3D"noopener">sabre2tg=
r@gmail.com</a>&gt;; Tiger Net &lt;<a href=3D"mailto:Tigers@autox.team.net"=
 target=3D"_blank" rel=3D"noopener">Tigers@autox.team.net</a>&gt;<br clear=
=3D"none"><strong>Subject:</strong> Re: [Tigers] The latest problem: Surgin=
g</p>=20
            <p>&nbsp;</p>=20
            <div>=20
             <div>=20
              <p><span style=3D"font-size: 12pt; font-family: sans-serif;">=
Isn't idle surging typically from a carburetor low float setting?</span></p=
>=20
             </div>=20
            </div>=20
            <p>&nbsp;</p>=20
            <div>=20
             <div>=20
              <p>On Sat, Aug 31, 2024 at 11:45=E2=80=AFAM Ron Fraser &lt;<a=
 href=3D"mailto:rfraser@bluefrog.com"; target=3D"_blank" rel=3D"noopener" sh=
ape=3D"rect">rfraser@bluefrog.com</a>&gt; wrote:</p>=20
             </div>=20
             <blockquote>=20
              <div>=20
               <div>=20
                <div>=20
                 <p>Stu</p>=20
                 <p>&nbsp;</p>=20
                 <p>Always difficult to troubleshoot remotely.</p>=20
                 <p>&nbsp;</p>=20
                 <p>You may have to do standard checks on all systems =E2=
=80=93 air, fuel and spark</p>=20
                 <p>Alcohol in the fuel can tear up hoses and gaskets</p>=
=20
                 <p>Check to make sure fuel filter is OK</p>=20
                 <p>Check for vacuum leaks</p>=20
                 <p>&nbsp;</p>=20
                 <p>My 1<sup>st</sup> thought =E2=80=93 the fuel level is h=
igh</p>=20
                 <p>Check the float level and check for any debris in the f=
loat bowl</p>=20
                 <p>&nbsp;</p>=20
                 <p>Remove the air filter and idle engine to see if it is a=
n air flow problem.</p>=20
                 <p>&nbsp;</p>=20
                 <p>Hope this helps</p>=20
                 <p>Ron Fraser</p>=20
                 <p>&nbsp;</p>=20
                 <p>&nbsp;</p>=20
                 <p><strong>From:</strong> Tigers &lt;<a href=3D"mailto:tig=
ers-bounces@autox.team.net" target=3D"_blank" rel=3D"noopener" shape=3D"rec=
t">tigers-bounces@autox.team.net</a>&gt; <strong>On Behalf Of </strong>Stu<=
br clear=3D"none"><strong>Sent:</strong> Saturday, August 31, 2024 9:57 AM<=
br clear=3D"none"><strong>To:</strong> Tiger Net &lt;<a href=3D"mailto:Tige=
rs@autox.team.net" target=3D"_blank" rel=3D"noopener" shape=3D"rect">Tigers=
@autox.team.net</a>&gt;<br clear=3D"none"><strong>Subject:</strong> [Tigers=
] The latest problem: Surging</p>=20
                 <p>&nbsp;</p>=20
                 <div>=20
                  <div>=20
                   <div>=20
                    <p><span style=3D"font-size: 12pt;">Ok, so I got the va=
cuum advance sorted and reset the timing, etc.&nbsp; But now there's anothe=
r issue.</span></p>=20
                   </div>=20
                   <div>=20
                    <p><span style=3D"font-size: 12pt;">&nbsp;</span></p>=
=20
                   </div>=20
                   <div>=20
                    <p><span style=3D"font-size: 12pt;">The car starts and =
warms up normally, choke opening, temperature gauge coming up to the thermo=
stat temp, etc. But then it starts surging at idle.&nbsp; Accelerating, dri=
ving both seem fine.&nbsp; But when it goes back to idle, waiting at a stop=
light or something, it starts having these little dips, which soon become l=
arger dips, to the point where it stops.&nbsp; It restarts right away, then=
 does it again.&nbsp; At a stoplight I have to left foot brake so that I ca=
n keep my foot on the throttle to keep it alive.&nbsp; &nbsp;</span></p>=20
                   </div>=20
                   <div>=20
                    <p><span style=3D"font-size: 12pt;">&nbsp;</span></p>=
=20
                   </div>=20
                   <div>=20
                    <p><span style=3D"font-size: 12pt;">Here's a video I sh=
ot in the garage as it started to do it after warming up.&nbsp; Anybody see=
n this before or... cured it?</span></p>=20
                   </div>=20
                   <div>=20
                    <p><span style=3D"font-size: 12pt;">&nbsp;</span></p>=
=20
                   </div>=20
                   <div>=20
                    <p><a href=3D"https://www.dropbox.com/scl/fo/0613ys0ieg=
dndjhnjt5a8/AIcza8ouXqEsp57qLWSlZOY?rlkey=3Ds9h2q3sal042y9z3t5oav2uwt&amp;d=
l=3D0" target=3D"_blank" rel=3D"noopener" shape=3D"rect">https://www.dropbo=
x.com/scl/fo/0613ys0iegdndjhnjt5a8/AIcza8ouXqEsp57qLWSlZOY?rlkey=3Ds9h2q3sa=
l042y9z3t5oav2uwt&amp;dl=3D0</a></p>=20
                   </div>=20
                  </div>=20
                 </div>=20
                </div>=20
               </div>=20
               <p style=3D"margin-bottom: 12pt;">__________________________=
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