Choking up
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Junior User
Joined: Mar 2013
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Choking up
Hey guys i have a 1979 460 with a dual plane intake, 750cfm holley carb, msd coil, msd wires, msd box, internally regulated alt, headers 3 inch exhaust, stock heads and all stick internals. So the problem I'm having is if I floor it from idle it chokes up and acts like it's gonna stall. I can hold it at 2k rpm and floor it and it has no problem Iv adjusted the carb multiple times, the accelerater pump spring seems to weak. I believe the problem is there just not sure. Do they make stiffer spring for the accelerater pump?
Lead Driver
Joined: Mar 2004
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No, no stiffer spring. Did this Holley run right and then for no reason just started doing this ? If you ease into it what does it do ? It runs fine other than this ? A 750 should have more then enough pump shot right out of the box for your setup.
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Junior User
Joined: Mar 2013
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Truck runs great. This is my only issue . If I'm holding throttle at 2k then it won't but from a dead stop at idle and I punch it. It chokes up
[ QUOTE=mark a.;16250869]No, no stiffer spring. Did this Holley run right and then for no reason just started doing this ? If you ease into it what does it do ? It runs fine other than this ? A 750 should have more then enough pump shot right out of the box for your setup.[/QUOTE]
[ QUOTE=mark a.;16250869]No, no stiffer spring. Did this Holley run right and then for no reason just started doing this ? If you ease into it what does it do ? It runs fine other than this ? A 750 should have more then enough pump shot right out of the box for your setup.[/QUOTE]
Elder User
Joined: Nov 2003
Posts: 778
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From: southeast Idaho
Probably need to set your accelerator pump is all unless you have other problems. There is several things you can adjust to get it right. What you need is for it to squirt gasoline out the nozzles as soon as you move the throttle. Yours may not be doing this. and also at the wide open you need a little slack so the pump is not bottomed out .015 or so I think.
Holley's website can explain it better than I can here so check what they say and go from there. You can adjust the spring on the arm, adjust the pump cam or change the pump cam.
That setting can change when you remove the fuel bowl too unless you pay attention and get it back on in exactly the same place..
Holley's website can explain it better than I can here so check what they say and go from there. You can adjust the spring on the arm, adjust the pump cam or change the pump cam.
That setting can change when you remove the fuel bowl too unless you pay attention and get it back on in exactly the same place..
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