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Old 08-28-2007, 09:39 PM
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Ford 390 FE hesitation/dead spot

Hi,
I have a dead spot in my car when advancing the accelerator pedal from just past no pedal pressure as you accelerate. This will happen from a dead stop or at any speed. What I mean is if I am doing 60 (or any other speed) and remove my foot from the pedal and coast and then start to depress the pedal, there is a dead spot where the engine wants to stop running unless I back off and then resume. So it will happen when starting out from a dead stop or in traffic or on the highway. Any ideas as to what are the possible causes and fixes?
Thanks, Eddie
64 Thunderbird
390 CI 300 HP

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Old 08-28-2007, 10:44 PM
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EDDIE,what carb do tou have? From my experience, the motorcraft carbs especially the two barrels have a problems with the accelerator pumps. it sounds this "MAY" be your problem regardless of carb. manufac. To check it remove the air cleaner and look into the carb while you manually open the throttle plates. PLEASE MAKE SURE THE ENGINE IS NOT RUNNING!! This may flood the engine a little, just hold it to the floor when you start it if its soon after you check this. What you waqnt to see is a steady squirt of fuel. If you can move th throttle linkage at all with no squirt than you need to repair or adjust either the linkage or the pump itself. If its been a long time since youve had the carb rebuilt it may be the best time.

GOOD LUCK
TOM
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Old 08-29-2007, 09:51 AM
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64 390 FE Deadspot

Thanks for the repy Tom. It's a Ford Autolite 4100 4 barrell that I purchased about 4 years ago from Pony Carburetor when they were still in upstate NY. Thanks Eddie
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Old 08-29-2007, 03:26 PM
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Tip-in hesitation on one of these is usually due to a bad accelerator pump diaphram (2100-4100 the same) and/or a bad vacuum advance cannister. You could still buy the diaphram from FORD, Basic PN 9B559. A complete kit (C2SZ 9A586-D) should also still be available. Of course, you can get it from PONY CARBS also.
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Old 08-30-2007, 11:40 AM
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Ford 390 FE Hesitation/Dead Spot Autilite 4100

OK, I just ordered the carb rebuild kit, C2SZ 9A586-D (CT 191A) from directfordparts.com for $21.51 plus shipping. Cheap enough and can't hurt to have. Thanks for the input, Eddie

P.S. Anyone have a sense for how engine timing could play into this issue?
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Old 08-30-2007, 12:06 PM
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Quote:
Originally Posted by namesake
P.S. Anyone have a sense for how engine timing could play into this issue?
If the vac advance isnt working correctly it can cause this problem
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Old 08-30-2007, 12:26 PM
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The Ford 2100/4100 carbs are quite sensitive to float levels, raising the front float a 1/16" or so will normally help your tip-in hesitation problem.
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Old 08-31-2007, 09:02 AM
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Quote:
Originally Posted by namesake

P.S. Anyone have a sense for how engine timing could play into this issue?
Use a hand held vacuum pump to see if the vacuum cannister holds vacuum. Verify breaker plate movement is smooth and returns when vacuum is released. With timing light see if timing advances with increased engine RPM.
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