[Tigers] The latest problem: Surging

[M Lafayette]

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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