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Old 11-04-2019, 07:49 PM   #1
Andy0011
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Default GAV closed, car dies

Hello everyone! I am new here and I am from Argentina. I don't speak english very well, sorry if I have mistakes!
My question for the forum is that I recently revived my 29 town sedan that was sleeping for more than 6 years because it did not started. I cleaned the plugs, and I disamble the zenith carb, cleaned it and it came back to life.
But I noticed that have a problem with the GAV. It acts very sensitive. If I open 1 turn to the left it sounds as if it too rich, if I try to find the 1/4 turn open the idle sounds ok to me, but if I close it just a little bit from there it begins to be irregular, and if I completely close it, the car dies.
I think that it should not happen, it should be running if it is closed, so I need some help with the possible diagnosis.
Thanks!!!
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Old 11-04-2019, 08:03 PM   #2
aermotor
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Default Re: GAV closed, car dies

Hope, you have no problem. GAV operation appears normal - just takes a little try and check to get it right and then leave it alone. At least my experience.

John
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Old 11-04-2019, 08:26 PM   #3
eagle
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Default Re: GAV closed, car dies

Mine is not that sensitive. It'll run with the GAV closed but will be lean. Try some Seafoam in the fuel for a while, it'll clean up the fuel system.
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Old 11-04-2019, 08:29 PM   #4
J Franklin
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Default Re: GAV closed, car dies

I think yours is working just fine. Run it 1/4+ open, no problem.
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Old 11-04-2019, 09:59 PM   #5
zzlegend
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Default Re: GAV closed, car dies

Andy, i have to run mine about 1/2 open and it seems happy there.
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Old 11-05-2019, 01:58 AM   #6
Chuck Sea/Tac
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Default Re: GAV closed, car dies

Unless your high altitude, 1/4 is normal.
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Old 11-05-2019, 04:23 AM   #7
Werner
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Default Re: GAV closed, car dies

Hallo Andy,

what you write is not a mistake. 1/4 open is only a guideline. That can vary. If the engine is cold, it must be opened further. If you are very high in the mountains, close far, etc ... .

If the valve needle sit is very well, the needle rotation also reacts very accurately. On my Roadster I feel 1/8 U immediately.

Perhaps your idle mix is a liitle bit too lean, try 1/8 turn left. -


BTW: Nice that not only I have a bumpy American language! Regards to Argentinia, have always good drives.
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Old 11-05-2019, 12:00 PM   #8
JoeCB
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Default Re: GAV closed, car dies

Andy , welcome to the forum, Have fun with your Model A … and your English is very good

Joe B
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Old 11-05-2019, 12:47 PM   #9
30 Closed Cab PU
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Default Re: GAV closed, car dies

Adjustment for IDLE Mixture Adjust Screw must be adjusted at 600 rpm or below. At 600 RPM and below GAV does not affect how motor runs, unless turned more than 1 - 11/2 turns open, So adjust this screw 1st.


GAV Adjusts Mixture from very fast idle 700 RPM up to fast running. At fast idle and above the Idle Mixture Screw does not affect the motor.


On my truck - For Cold Starting I set the GAV to 2/3 open. Start, adjust GAV to best running as motor warms.
- At fast idle warm runs best at 1/8 open. less than 1/8 - closed motor runs poorly, acts like it will stall.
- At higher RPMs open to 1/4 - 1/2 open, less than that and I get a "cough" through the carb when slowing down and also at shifting.


Run your A for best running, do a spark plug read after running fast speeds. If Plugs look good, use and enjoy your A.


Here are a couple of links to info written by a motor A vender her in teh USA. Has Adjustment procedure, and everything you would want to know and more. Also attached a link to the Instruction manual. Includes settings, how to start, and a good resource for basic info.


Hope this helps.


https://www.modela.org/idle_adjustment.html
https://www.modela.org/
http://www.motormayhem.net/model-a-f...owners-manual/
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