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Unread 05-16-2009   #1 (permalink)
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Default 1966 mustang starts but idles rough then dies

it is a 289 with a 2 barrel carb. it takes a few tries to get it to start. i got it to run for 1 minute once. usually lasts 15 seconds until it dies. what could be the problem. i just rebuilt the carb, but it didn't help. could it be the idle screws aren't adjusted properly?
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Unread 05-16-2009   #2 (permalink)
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Unread 05-16-2009   #3 (permalink)
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Welcome to AFM. Check out the tech section for some help.
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Unread 05-16-2009   #4 (permalink)
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Welcome to the site. Did you put the throttle spring back on?
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Unread 05-17-2009   #5 (permalink)
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which one is the throttle spring? the one that closes the throttle after i let the pedal out? i put that one back on.
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Unread 05-17-2009   #6 (permalink)
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could it also be that my timing isn't adjusted properly?
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Unread 05-17-2009   #7 (permalink)
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May not be getting enough fuel from the tank. Have you checked your fuel pump, fuel filter (it does not take much trash to plug the original type) and the filter on the end of the sending unit in the tank.
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Unread 05-17-2009   #8 (permalink)
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theres definitely enough fuel. We didnt connect the float in the carb correctly at first and it was gushing gas. we fixed that but it didn't help
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Unread 05-30-2009   #9 (permalink)
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i had thhe same problem in my 67. try to adjust the clutch cable.
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Unread 05-31-2009   #10 (permalink)
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Could be all the things that you mention in your posts - hot or cold idle adjustment, timing or air/fuel mixture. I think that all can contribute to the symptons.

You may want to check out Veronica's blog (the link is provided below) on the article regarding carbs -- it can probably point you in the right direction and has pictures and written so that you can easily understand it.


I think that it is in the April 2008

The Care and Feeding of Ponies

Last edited by Aloha66; 05-31-2009 at 02:13 AM. Reason: provide link
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Unread 06-02-2009   #11 (permalink)
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when my 66 did that it was the choke kept sticking close so i just zip tied it open and no more problems. i live in houston so not much need for a choke
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Unread 06-03-2009   #12 (permalink)
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I got this same deal on my 66 coupe but i just figured it was just how old cars were. It always takes a couple tries to start for me and i have to keep on the gas a little bit to keep it from stalling out. It seems that the car has to run 5 miles an hour before the motor will stay running. Never gave it any thoughts about it though. Figure it just needs to warm up.
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Unread 06-10-2009   #13 (permalink)
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I went to try to work on the mustang, but when i tried to start it, it didn't do anything but turn over. everything is how it was before when it sort of ran. i noticed that there was a bit of gas coming out between the carb and the spacer. I tightened the bolts down a bit more. what are the torque specs for the bolts holding the carb to the intake manifold? tightening them didn't help get the car to start. what could cause this?
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2 barrel, 289 engine, dies, rough idle, starts



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