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'31 Model A Coupe running rough


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MY COUPE RUNS VERY ROUGH(JERKS, HEAVES GREATLY) PARTICULARLY IN FIRST AND SECOND GEARS AT SPEEDS UNDER TEN mph. I ADD ONE ONCE OF  LEAD ADDITIVE PER FULL TANK. IS THAT SUFFICIENT AND POSSIBLE CAUSE? SET LOW SPEED CARB NEEDLE AT ONE AND A HALF TURNS. ADJUSTING IN EITHER DIRECTION  PROVIDES NO NOTICEABLE CHANGE. Have put in new plugs and points, adjusting POINTS USING BRATTONS QUICK SETTING POINT TOOL. AT HIGHER SPEEDS, RUNS A TAD BETTER BUT ALWAYS FEEL ENGINE IS POUNDING HARD, IF THAT VAGUE WORD DESCRIBES IT. ANY HINTS WOULD BE VERY WELCOME. THOUGH i USE SETTING TOOL, OPTIMUM POINT SETTING IN YOUR EXPERIENCE WOULD STILL BE WELCOME. WES, PANTON, VT

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  • 4 weeks later...

do you get clean flow from your tank? you might be clogged up with rust.

 

you can loosen your shut off valve under your dash and put a 5 gallon bucket under it and see if your gas is clean. flush the tank a few times and insert a pencil filter, from one of the vendors.

 

have had this problem on many A's Ive bought and the pencil filter fixes it imed.

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