[Tigers] The latest problem: Surging
Dr. T. Y. McDowell
tym2 at comcast.net
Sat Aug 31 16:39:34 MDT 2024
Stu,
Hoping it works out. Keep us posted. When Tigering, there's always something!
Tym McDowell
> On 08/31/2024 6:23 PM EDT Stu <sabre2tgr at gmail.com> wrote:
>
>
> I should have added this info at the start: Stock 260, original carb, original points type ignition.
>
> Things I've tried since my original message:
>
> Tightened the nuts on the carb mounting studs, and the screws that hold the top on, nothing was loose
>
> All the electrical connections seem tight, no corrosion.
>
> Let the car warm up again, and it started doing it a little.
>
> The old carb cleaner trick: I sprayed carb cleaner all over anything that might have a vacuum leak,carb base, hoses, and so on... nothing happened
>
> With the timing light connected, I watched the advance as a couple dips happened... no change, timing was right where I left it, and I could not detect any missing flashes during the dip.
>
> And, after a few minutes, it stopped doing it.
>
> So that's it for today. Tomorrow is busy, Monday I'll take it for a drive and see if it's any different, or if any more clues appear.
>
> On Sat, Aug 31, 2024 at 4:54 PM M Lafayette via Tigers <tigers at autox.team.net mailto:tigers at autox.team.net> wrote:
>
> > I had the same symptoms years ago. Leak in the vaccuum going to the PCV 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.
> > Mark L
> >
> > In a message dated 8/31/2024 3:49:03 PM Eastern Daylight Time, tigers at autox.team.net mailto:tigers at autox.team.net writes:
> >
> >
> > >
> > > I think a low float condition would not let it drive fine.
> > >
> > >
> > >
> > > Many conditions can contribute to idle surging so it starts with a process of elimination.
> > >
> > >
> > >
> > > Systems need to be checked – air, fuel and spark – loose wire connection, vacuum
> > >
> > >
> > >
> > > Ron Fraser
> > >
> > >
> > >
> > >
> > >
> > >
> > >
> > > From: Rob Hogan <robertdhogan at gmail.com mailto:robertdhogan at gmail.com>
> > > Sent: Saturday, August 31, 2024 3:18 PM
> > > To: Ron Fraser <rfraser at bluefrog.com mailto:rfraser at bluefrog.com>
> > > Cc: Stu <sabre2tgr at gmail.com mailto:sabre2tgr at gmail.com>; Tiger Net <Tigers at autox.team.net mailto:Tigers at autox.team.net>
> > > Subject: Re: [Tigers] The latest problem: Surging
> > >
> > >
> > >
> > > Isn't idle surging typically from a carburetor low float setting?
> > >
> > >
> > >
> > > On Sat, Aug 31, 2024 at 11:45 AM Ron Fraser <rfraser at bluefrog.com mailto:rfraser at bluefrog.com> wrote:
> > >
> > > >
> > > > Stu
> > > >
> > > >
> > > >
> > > > Always difficult to troubleshoot remotely.
> > > >
> > > >
> > > >
> > > > You may have to do standard checks on all systems – air, fuel and spark
> > > >
> > > > Alcohol in the fuel can tear up hoses and gaskets
> > > >
> > > > Check to make sure fuel filter is OK
> > > >
> > > > Check for vacuum leaks
> > > >
> > > >
> > > >
> > > > My 1st thought – the fuel level is high
> > > >
> > > > Check the float level and check for any debris in the float bowl
> > > >
> > > >
> > > >
> > > > Remove the air filter and idle engine to see if it is an air flow problem.
> > > >
> > > >
> > > >
> > > > Hope this helps
> > > >
> > > > Ron Fraser
> > > >
> > > >
> > > >
> > > >
> > > >
> > > > From: Tigers <tigers-bounces at autox.team.net mailto:tigers-bounces at autox.team.net> On Behalf Of Stu
> > > > Sent: Saturday, August 31, 2024 9:57 AM
> > > > To: Tiger Net <Tigers at autox.team.net mailto:Tigers at autox.team.net>
> > > > Subject: [Tigers] The latest problem: Surging
> > > >
> > > >
> > > >
> > > > Ok, so I got the vacuum advance sorted and reset the timing, etc. But now there's another issue.
> > > >
> > > >
> > > >
> > > > The car starts and warms up normally, choke opening, temperature gauge coming up to the thermostat temp, etc. But then it starts surging at idle. Accelerating, driving both seem fine. But when it goes back to idle, waiting at a stoplight or something, it starts having these little dips, which soon become larger dips, to the point where it stops. It restarts right away, then does it again. At a stoplight I have to left foot brake so that I can keep my foot on the throttle to keep it alive.
> > > >
> > > >
> > > >
> > > > Here's a video I shot in the garage as it started to do it after warming up. Anybody seen this before or... cured it?
> > > >
> > > >
> > > >
> > > > https://www.dropbox.com/scl/fo/0613ys0iegdndjhnjt5a8/AIcza8ouXqEsp57qLWSlZOY?rlkey=s9h2q3sal042y9z3t5oav2uwt&dl=0
> > > >
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