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Old 06-10-13, 07:59AM   #1
jeffb
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Default Holley 4160 idle problem

Hello, finally rebuilt my holley 4160, all factory specs/settings, nothing has been modified/drilled. The thing runs like a S.O.B. in all conditions except idle. I adjusted idle screws for max vacuum, 10", and I tried the trick of giving the secondary idle stop screw 1 turn, that didn't work. It will idle at 1600-2000 rpm, and drop to 800 in gear but I have to left foot it to keep from stalling. If I drop the idle to less than 1600, it will idle for a few seconds and go to stall, if I give it a quick shot of the accelerator, it will pick back up for a few seconds and go to die again. I set the floats right, until gas is just at the bottom of the sight glass. I am guessing I have to enlarge the idle feed restrictors, or drill the hole in the primary butterflies.

Oh yeah, this carb ran great on the factory spec 455 that came with the car when I bought it, except for blowing out the power valve. Please see my engine specs at the signature section of my posts at the bottom. Any info would be great! Thanks!
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68 Firebird, 455, forged rods/pistons, 1971 #96 unported but polished heads, Holley Street Dominator intake, Q-jet for now, 1 7/8" headers, Ultradyne hydraulic cam, .231-.239@.050, .538/.558 lift with 1.65 Comp Cams roller rockers, TH350 trans, 2800 stall converter, 3.42 gears.
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Old 06-27-13, 11:43PM   #2
shaker455
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Jeff,
Get yourself an AFR meter :
http://www.amazon.com/AEM-30-4100-UE...s=aem+wideband

Also your combo would benefit from a 4-corner idle unit.

Don't drill the blades, byapass air is not the issue...it's not enough idle fuel.
Jeff
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Old 07-01-13, 08:46AM   #3
jeffb
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Shaker- Hello, I think you're right, I get the pig running, spray some carb cleaner in the primaries, keeps running until used up, dies.
This will sound really dumb, but here's my luck. No fuel at all to the back bowl (remember, dual feed, single pump). Took the fuel rail off and the part of the rail going to the rear secondary bowl was completely blocked. My luck, pulling this dual fuel rail off the shelf in my garage and it's junk. I know this should have no effect on the front bowl, but what do you think?
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68 Firebird, 455, forged rods/pistons, 1971 #96 unported but polished heads, Holley Street Dominator intake, Q-jet for now, 1 7/8" headers, Ultradyne hydraulic cam, .231-.239@.050, .538/.558 lift with 1.65 Comp Cams roller rockers, TH350 trans, 2800 stall converter, 3.42 gears.
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Old 09-20-14, 06:37PM   #4
Zedo
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did you ever fix this carb ? pull the primary block and clean it, and spray carb cleaner through every emulsion, air bleed, fuel passage. then check every single one visually with a light. I recently found (2) 4160's that had emulsion holes in the main wells, that were not drilled all the way through from the factory. it had no emulsion at all on one primary side. these were problematic carbs that got pulled eventually that I got for free and $20. after drilling out the emulsion holes to proper size the one block runs like a champ. also check the main body to metering block surface, had another Holley that was warped badly there and leaking gas into the power valve chamber at idle. Holley QC was lousy from time to time, they are a good design but you may have a carb from a bad day at the factory.

4160 is a vac sec with secondary metering plate, correct ?
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