[Tigers] The latest problem: Surging

[Stu]

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> 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 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>
> *Sent:* Saturday, August 31, 2024 3:18 PM
> *To:* Ron Fraser <rfraser at bluefrog.com>
> *Cc:* Stu <sabre2tgr at gmail.com>; Tiger Net <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> 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> *On Behalf Of *Stu
> *Sent:* Saturday, August 31, 2024 9:57 AM
> *To:* Tiger Net <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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>
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>
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