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Old 02-17-2007, 11:42 AM
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dead spot in my throttle

Ive just recently upgraded the top end of my 350. i took off the old 2bbl carb and upgraded to a 650 avs thunder from edelbrock . the intake i bought with the carb is a rpm air gap also from edelbrock . since then ive had a really bad dead spot in my throttle. ive tried fixin it but ever time i get rid of it... it comes back. so far ive uped the timeing to 16BTDC, and increced the amount of fuel by way of the plunger. after each fix the problem went away for a few days but it just keeps comin back . i also have an adjustable vaccum advance set at zero turns out. am i over carbing the motor ???

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Old 02-17-2007, 01:06 PM
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This may be a stupid question, but do all 4 of the throttle plates open/close simulataniously? Or do two of them open at certain times when going WOT?
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Old 02-17-2007, 01:19 PM
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all 4 open at the same time. but the secondarys have an air valve that is suposed to block some of the air upon WOT. its supposed to block some of the air to let the fuel catch up but it opens up just a split second after the plates open. i can adjust that to get more air faster but i tried adjustin it to let more air in and vise versa. but the dead spot is still there.
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Old 02-17-2007, 01:55 PM
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i forgot... i also changed the metering springs to 8hg. that took away most of the dead spot.
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Old 02-19-2007, 11:09 AM
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I had the same problem with the exact same carb and intake setup you have...Timing fixed it for me though...I have mine set at 12 degrees...Have you tried retarding the timing since you've done the other changes?
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Old 02-19-2007, 11:11 AM
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actually no i havent. thats a good point. everyone keep tellin me to up the timein. when i go to work on my car later today ill try that.
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Old 02-19-2007, 11:13 AM
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I hope it works for you...Good luck!
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Old 02-20-2007, 10:45 PM
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i changed my fuel filter (way dirtier then i thought) i looked at all my fule lines and the tank. everything looks good. the pump looks good but i didnt pull it to get a really good look. i dont know if the filter fixed my prob coz i tried pullin my oil pan out to replace the gasket coz it was leakin my couldnt get it out so right now i dont know if changin the filter fixed it. after i figure out my oil pan ill see how she runs if its the same ill pull the fuel pump and look at that. far as i know its workin just fine but ill still pull it. any other ideas that might coz my dead spot???
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Old 02-20-2007, 10:50 PM
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can some delete this thread its??? i messed up and made 2 of this one.
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