[Tigers] Tiger won't idle after a bout of hard acceleration

[Andy Walker]

Rick:

 

Two words…”vacuum leak.”

 

Background…I had this very problem before on my old Tiger (B9470058) back in 1982.  I was running the open track event at the Mid-America Shelby Meet in Tulsa, OK, and having a great time.  All of a sudden, I came into the pits after a session and the car wouldn’t idle at all; it would die once you let off the throttle.  We jumped on the problem immediately, even rebuilding the Holley at the track, but to no avail.  I ended up towing the car home, fearing that I’d really done something terrible to it. 

 

Once I got it home and started looking closely at it, I discovered that the brake booster vacuum line had slipped off the nipple on the intake.  Yep…a direct, rather large vacuum leak.  Plugged the line back onto the fitting and, voila…the car idled just fine.  

 

Moral of the story...check all your vacuum connections before getting into anything else.  I’d be willing to bet that a vacuum leak will be your culprit.

 

Best of luck and keep us posted,

Andy Walker

Edmond, OK

From: Tigers [mailto:tigers-bounces at autox.team.net] On Behalf Of R Flynn via Tigers
Sent: Monday, September 4, 2017 12:38 PM
To: Ron Fraser <rfraser at bluefrog.com>; tigers at autox.team.net
Subject: Re: [Tigers] Tiger won't idle after a bout of hard acceleration

 

Forgot to add the additional info Mayf suggested

- 1965 289, rebuilt sometime in the 1990s, installed in my MK1 sometime before that

- Offenhauser dual port 360 intake manifold

- Edelbrock Performer 500cfm w/manual choke

- Engine has been running fine until this happened a few days ago

 

On Mon, 4 Sep 2017 at 12:29, Ron Fraser <rfraser at bluefrog.com <mailto:rfraser at bluefrog.com> > wrote:

Rick

                I would take the top of the carb off, assuming stock Autolite;

Check fuel level

Check float operation

Check for debris in the fuel bowl and in the jets

Fix any problems you find

 

If there were problems start engine to see if it is running better.

 

Check the position of the idle jets

Count the turns in for each – then put them back to original position

Start engine

If no idle – turn idle jets out a ¼ to ½ turn

Start engine

 

Ron Fraser

 

From: R Flynn [mailto:flynnr2 at gmail.com <mailto:flynnr2 at gmail.com> ] 
Sent: Monday, September 04, 2017 10:17 AM
To: Ron Fraser <rfraser at bluefrog.com <mailto:rfraser at bluefrog.com> >; tigers at autox.team.net <mailto:tigers at autox.team.net> 
Subject: Re: [Tigers] Tiger won't idle after a bout of hard acceleration

 

All,

Thanks for the replies - quick update.

Still showing same behaviour starting cold - starts, runs if given gas, just shuts down if left to idle (no surges, running doesn't seem rough if given gas). Certainly feels like fuel isn't getting to where it needs to go.
- Everything appears to be where it ought to be on the carb, no springs or screws missing, etc.
- Fuel is pumping fine & clear up & through the fuel filter

Will try to do some more poking around later today, but need to do some other chores first!

Rick

On Sat, 2 Sep 2017 at 10:06, Ron Fraser <rfraser at bluefrog.com <mailto:rfraser at bluefrog.com> > wrote:

Rick

                There is an old adage – any time you think you have a carb problem, check the advance curve 1st.

Your case sounds like there is a problem in the carb; it may need a rebuild.  Check the advance curve 2nd.

 

Last time I had a problem like this was with a mid-70’s Weber progressive 2 bbl. – a chunk of RTV got into the primary jet and I had to floor it to keep it running.

 

Ron Fraser

 

From: Tigers [mailto:tigers-bounces at autox.team.net <mailto:tigers-bounces at autox.team.net> ] On Behalf Of R Flynn via Tigers

Sent: Friday, September 01, 2017 6:53 PM


To: <tigers at Autox.Team.Net <mailto:tigers at Autox.Team.Net> > <tigers at autox.team.net <mailto:tigers at autox.team.net> >
Subject: [Tigers] Tiger won't idle after a bout of hard acceleration

 

All,

 

Would appreiciate any thoughts on my latest conundrum ...

 

Accelerated hard away from a stop light earlier today and now my Tiger won't idle - just dies out, including while shifting if I take my foot off the gas (once the transmission engages, it starts running again).   Starts up fine, but need to stay on the gas to keep it going.

 

Was too hot to start investigating but will need to look into it tomorrow - thinking perhaps something popped off the carburettor?

 

Cheers in advance,

 

Rick

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