Secondaries not opening, hesitates when I floor it
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Joined: May 2003
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From: Toledo, OH
Car: 1992 Firebird
Engine: forged 357
Transmission: 700r4, 2200-2400 stall, vette servo
Axle/Gears: stock pegleg 2.73 drum (temp)
Secondaries not opening, hesitates when I floor it
Yeah well the choke is wired +12v and the secondaries aren't opening. The car hesitates when I floor it, timing is around 10 base timing with vac-adv on manifold. I can't tell if my timing is off, if I'm running rich/lean or what the hell is going on.
I thought carbs were supposed to be EASY
I thought carbs were supposed to be EASY
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From: out of my mind; be back in 5 minutes....
Car: 1989 Firebird Formula
Engine: Internal Combustion
Transmission: Completed
Axle/Gears: ones that turn.
How are you verifying that the secondaries aren't opening? Driving around with the hood and air cleaner off?
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Supreme Member
Joined: May 2003
Posts: 1,995
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From: Toledo, OH
Car: 1992 Firebird
Engine: forged 357
Transmission: 700r4, 2200-2400 stall, vette servo
Axle/Gears: stock pegleg 2.73 drum (temp)
Originally posted by Owen
What kind of carb? Holley? Vac secondaries? We need more information...
What kind of carb? Holley? Vac secondaries? We need more information...
sorry, it was in the sig
Thread Starter
Supreme Member
Joined: May 2003
Posts: 1,995
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From: Toledo, OH
Car: 1992 Firebird
Engine: forged 357
Transmission: 700r4, 2200-2400 stall, vette servo
Axle/Gears: stock pegleg 2.73 drum (temp)
Originally posted by Petes 84Z28
How are you verifying that the secondaries aren't opening? Driving around with the hood and air cleaner off?
How are you verifying that the secondaries aren't opening? Driving around with the hood and air cleaner off?
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Joined: Jul 1999
Posts: 1,593
Likes: 3
From: out of my mind; be back in 5 minutes....
Car: 1989 Firebird Formula
Engine: Internal Combustion
Transmission: Completed
Axle/Gears: ones that turn.
They shouldn't open doing that. Only when the engine is under load - accelerating the vehicle.
Joined: Jan 2004
Posts: 1,761
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From: The "D"
Car: A Portly 85 Z28
Engine: 4.530 X 4.250 BBC
Transmission: under rated for this application
Axle/Gears: also under rated
hesitates with a eldy carb is common complaint, you probably are going lean on secondary throttle opening, I would look at a bigger squirter or delay or tighten the secondary opening, it could be opening too fast
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Thread Starter
Supreme Member
Joined: May 2003
Posts: 1,995
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From: Toledo, OH
Car: 1992 Firebird
Engine: forged 357
Transmission: 700r4, 2200-2400 stall, vette servo
Axle/Gears: stock pegleg 2.73 drum (temp)
Originally posted by greezemonkey
hesitates with a eldy carb is common complaint, you probably are going lean on secondary throttle opening, I would look at a bigger squirter or delay or tighten the secondary opening, it could be opening too fast
hesitates with a eldy carb is common complaint, you probably are going lean on secondary throttle opening, I would look at a bigger squirter or delay or tighten the secondary opening, it could be opening too fast
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From: Mercedes Norte, Heredia, Costa Rica
Car: 1984 Z28 Hardtop
Engine: 383 Carb
Transmission: 4L60
Axle/Gears: 3.54 Dana 44
The only way to delay the secondary opening is to add weight to the counterweights on the secondary air valve.
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Supreme Member
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From: Toledo, OH
Car: 1992 Firebird
Engine: forged 357
Transmission: 700r4, 2200-2400 stall, vette servo
Axle/Gears: stock pegleg 2.73 drum (temp)
Originally posted by Apeiron
The only way to delay the secondary opening is to add weight to the counterweights on the secondary air valve.
The only way to delay the secondary opening is to add weight to the counterweights on the secondary air valve.
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From: Calgary, AB, Canada
Car: 1982 Trans-Am
Engine: 355 w/ ported 416s
Transmission: T10, hurst shifter
Axle/Gears: 10 bolt, true-trac, 3.73
You mentioned you can't tell if your timing is off... Why not? I imagine this isn't the source of your problem (timing), but it's usually easiest to check....
Isn't there an easy way to check if it's going lean or rich? I mean, with a q-jet you could disconnect the accelerator pump, if it's better then it was rich, if worse, lean... Right?
Isn't there an easy way to check if it's going lean or rich? I mean, with a q-jet you could disconnect the accelerator pump, if it's better then it was rich, if worse, lean... Right?
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From: Mercedes Norte, Heredia, Costa Rica
Car: 1984 Z28 Hardtop
Engine: 383 Carb
Transmission: 4L60
Axle/Gears: 3.54 Dana 44
Originally posted by Token
I thought carbs were supposed to be simple.
I thought carbs were supposed to be simple.
Thread Starter
Supreme Member
Joined: May 2003
Posts: 1,995
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From: Toledo, OH
Car: 1992 Firebird
Engine: forged 357
Transmission: 700r4, 2200-2400 stall, vette servo
Axle/Gears: stock pegleg 2.73 drum (temp)
Originally posted by Apeiron
No more complicated or simple than anything else. You just picked a carb that doesn't have an adjustable secondary opening, unfortunately.
No more complicated or simple than anything else. You just picked a carb that doesn't have an adjustable secondary opening, unfortunately.
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Joined: Jan 2000
Posts: 20,981
Likes: 11
From: Mercedes Norte, Heredia, Costa Rica
Car: 1984 Z28 Hardtop
Engine: 383 Carb
Transmission: 4L60
Axle/Gears: 3.54 Dana 44
Thread Starter
Supreme Member
Joined: May 2003
Posts: 1,995
Likes: 0
From: Toledo, OH
Car: 1992 Firebird
Engine: forged 357
Transmission: 700r4, 2200-2400 stall, vette servo
Axle/Gears: stock pegleg 2.73 drum (temp)
Originally posted by Apeiron
http://www.edelbrock.com/automotive/eps_intro.html
http://www.edelbrock.com/automotive/eps_intro.html
plus I have that all in the booklet that came with the carb
nothing is really helping, because I dont understand whats good and what's bad
Token,
I suggest:
changing the accelerator pump setting,
up and down one 'hole', and tell us what happens.
also, the choke must be completely open,
wire it open, if there is any doubt.
I suggest:
changing the accelerator pump setting,
up and down one 'hole', and tell us what happens.
also, the choke must be completely open,
wire it open, if there is any doubt.
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1406, 383, adjustable, carb, chokes, diagnosing, edelbrock, fast, floor, kick, lean, open, opening, secondaries, secondarys, whta






