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Classic Mustangs Tech Forum

Technical discussions specific to 1964-1967, 1968-1970, and 1971-1973 Classic Mustang. Discuss all tech related to in-line six cylinder and V8 powered Vintage Mustangs here.

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Unread 08-06-2011   #1 (permalink)
durtydawgster is offline Apprentice

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Default air/fuel mixture Edelbrock 1406

I have a 1965 Ford Mustang Coupe with a 302 and an Edelbrock Performer 1406. Recently the car started running poorly. As well, I moved to an area that is approximately 2500 ft higher in elevation. I began adjusting the air/fuel mixture screws and found that when adjusting the right side screw, the engine idle would go up or down. I found the point at which the engine idle was the highest. However, when adjusting the left side, no change in engine idle. As a matter of fact; I can remove the screw all together and nothing changes. Does this mean that side is plugged and I should remove the carb, disassemble it, and clean it up; replacing any gaskets and seals necessary? In other words, rebuild the carb? Or is it possible that i have a vacuum leak? Any suggestions on what would make the left side air/fuel mixture have no effect on engine speed would be appreciated. Thanks
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Unread 08-06-2011   #2 (permalink)
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Try removing the screw and blowing it out with carb cleaner/compressed air. If that doesn't do it, yeah I'd open her up. Pretty simple to work on.
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Unread 08-06-2011   #3 (permalink)
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+1 for Explorer's post!
I'll add, have you checked your engine vac?
Good Luck!
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Unread 08-06-2011   #4 (permalink)
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I hope all your carb needs is a good cleaning.

However, I have the same carb on my '65 289 and have the exact same problem -- it is my LH (meaning driver's side) a/f mixture screw that it almost completely non-functional. Finally took it to a carb shop (where they cleaned it and did some other work) and they told me someone (me?) must have screwed the screw in too far at some point and reamed out the seat. According to them, there is no fix. So what I did to get it to run as well as possible:

1. with engine off, turn both screws in to a very gentle snug fit, then open both one full turn, 2. assuming engine will now start (if not, open both slightly more), begin opening the bad (d/s) screw to get the best idle possible (knowing that at this point the motor is still running rough), 3. move to the passenger side (p/s)screw and adjust that to get the best idle.

I found that once I've finished with the p/s screw, further adjustments to the d/s screw have no effect.

Per the carb "experts," this problem with the seating of the adjustment screw is not uncommon on these carbs. I'm able to get my carb to run fairly well, but I hope to eventually go back to an Autolite 4100.

Good luck.
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Unread 08-07-2011   #5 (permalink)
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Thanks for your help. I blew it out using carb cleaner and an air compressor. When I blew it out; liquid (fuel and carb cleaner) came out of the top of the carb near where the metering rods are installed. I adjusted it up as normal, and it is now running great. Thanks.
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Unread 08-07-2011   #6 (permalink)
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Quote:
Originally Posted by durtydawgster View Post
Thanks for your help. I blew it out using carb cleaner and an air compressor. When I blew it out; liquid (fuel and carb cleaner) came out of the top of the carb near where the metering rods are installed. I adjusted it up as normal, and it is now running great. Thanks.

Thanks for reporting back. It's good to hear some of our dreams come true.
Happy Trails!
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Unread 08-07-2011   #7 (permalink)
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Very good! Sometimes we get lucky. If it was a spec of dirt it may come back to haunt you again. If just varnish buildup, you should be fine.
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Unread 08-07-2011   #8 (permalink)
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I am going to run some fuel additive so hopefully it cleans it out. I can't believe the difference that one spec of dirt, or one blocked passages can make in how it runs. Very important lesson I learned about not running the fuel too low. I suspect that maybe it sucked in some dirt from the bottom of the tank.
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Unread 08-07-2011   #9 (permalink)
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And keep a clean fuel filter on it. They're cheap.
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Unread 08-12-2011   #10 (permalink)
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If it happens again, there is a probably a random bit of rubbish floating around in the float bowl and it is occasionally getting caught in the primary jet. Pop the top off and clean the float bowl with some carb cleaner. Whatever it is should be big enough to see. If you are careful and the stars are in alignment, you may be able to reuse the top gasket. Just check it closely for any tears before reinstalling the top plate.
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