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Old 12-18-2011, 09:59 PM
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Edelbrock 1406

My wife's car had to go into the shop so I decided to pull my 69 Camaro out to drive until hers is fixed. I drive my Camaro about ounce a week and it always ran good. I drove it last week and noticed it was running rough and on the rich side. Upon futher inspection I noticed the left mixture adjustment screw didn't work at all, I even unscrewed it and it still ran like crap with no leaking gas from the mixture screw port. Any suggestions?

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Old 12-18-2011, 10:23 PM
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Usually when the idle mixture screws don`t operate it`s due to too much fuel pressure, float level too high, trash in the needle and seat assembly causing the needle to stick in the open position, trash in the idle circuit or spark timing set too low causing the engine to pull off the main boosters to idle.
It sounds like there`s trash in the idle circuit so check that first.
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Old 12-18-2011, 11:39 PM
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I'd also check for vacuum leaks around the base the of the carb or try retightening. I agree with the dirt in the idle circuit. Sometimes, just spraying some carb cleaner inside the carb will remove the dirt.
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Old 12-19-2011, 07:58 AM
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I already checked for vacumn leaks and can't find any, I'm thinking it's dirt in the idle circut. This was a new carborater that was installed when I built the engine and installed about a year ago. I've since replaced the gas tank and sending unit with a new sock on the fuel pickup. Car was and has always run smooth until I needed it.
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Old 12-19-2011, 09:59 AM
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Unfortunately, despite everything being replaced and new, the possiblity of getting crude in the carburator happens, especially if the car sits for a while. Dirt and soot settles to the bottom and is usually sucked up into the carb. Not to mention buying crappy gasoline... It's important to have a good fuel filter and to replace the filter often. BTW- that's a nice looking Camaro you got.
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Old 12-19-2011, 05:46 PM
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I think I fixed it. I did pull the needle adjustment srews out and sprayed carborater cleaner down the holes and every where else I could think of and that seemed to do it. Thanks guys!
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