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Old 04-15-2011, 01:20 AM   #1
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Stalling out and back fireing

I just bought my first mustang (1967) and on a cold start it runs great. Once you heat it up and shut it off then try to restart it as soon as you put it in gear it starts to stall out. If you let it sit running for a minute then put it in gear it does run but very ruff and it back fires and bogs out as you give it gas. Like I said though cold it runs great and doesn't over heat while driving in fact I just drove it 70 mph for almost 2 hrs on the freeway with no problems. If did seem to want to back fire a few times if I floored it but otherwise it ran great. Any ideas as stated it's a 1967 mustang straight 6 single barrel carb.
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Old 04-15-2011, 11:05 AM   #2
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Re: Stalling out and back fireing

Sounds like ignition, or battery issues.
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Old 04-15-2011, 11:30 AM   #3
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Batt is brand new
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Old 04-15-2011, 11:35 AM   #4
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I would check ignition system first. Cap/rotor/points/condenser.
Sounds like the choke may be sticking also. Possibly carb issues.
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Old 04-15-2011, 12:34 PM   #5
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I just replaced my cap and wires today and still doing it. I will check my carb I was thinking it might be my water pump???
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Old 04-15-2011, 08:00 PM   #6
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I had that on my 66. I ended up putting a spacer between my intake and my carb to keep the heat out of my carb. It was heating the gas in the carb and ran great on the first Start but if I shut it off and started it a little bit latter the carb was vapor locked and I would have to pump the gas alot to get it going again and flood it out really bad. I few mustang mechanics told me it was a common problem and a spacer changed everything...
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Old 04-15-2011, 08:03 PM   #7
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Good luck!!!
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Old 04-16-2011, 12:03 AM   #8
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Thanks I will try the spacer
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Old 04-16-2011, 05:43 AM   #9
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I used a phenolic carb spacer, it is made to lower heat transfer from the intake and carb. It made all the difference in the world for my car. I am using the 1/2" spacer. Make sure you have room between the air cleaner and your hood if you go with a taller spacer.
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Old 04-16-2011, 05:28 PM   #10
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It sounds like the timing is too far advanced.
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Old 04-17-2011, 12:11 PM   #11
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Lightbulb Re: Stalling out and back fireing

yep it sure soynds like timing is off somewhere
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Old 04-18-2011, 01:18 AM   #12
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Would that only act up when it's hot though, I figured it the timing was out it would do that all the time.
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Old 04-18-2011, 09:46 AM   #13
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Re: Stalling out and back fireing

Yes if it was the timing it would do it all the time. Sounds like a carb issue, What size carb vs. motor do you have. If the carb jets are to big then it could be giving to much gas and it wouldn't be a only happens when its hot it would be because when its warming up then its running faster there for burning the extra gas or when you ran 70mph it was burning extra gas. After warming up and its just idling then its feeding more gas then the motor can burn. But Iam just talking from my own situations so hope it helps you.
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Old 04-18-2011, 04:28 PM   #14
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I think your right I drove it today and I could really smell gas as I was driving so I think it is the carb too.
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