Choke sticking?
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From: Worcester
Car: 1984 Firebird T/A
Engine: 406sbc
Transmission: TH400
Axle/Gears: Moser 9"
Choke sticking?
The carb is a Holley 650DP 4777, mechanical secondaries with a electric choke. I was playing around with it today while I was bored and I noticed at WOT the plate on the choke tower wasnt opening all the way. Maybe it's because the car is off but it was only opening like 1/4 maybe 1/2 at most. Do I need to adjust it and if I do how should I go about doing it? Or is it because the car is off?
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Joined: Jan 2000
Posts: 20,981
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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
Re: Choke sticking?
If the engine is cold, the choke should be closed. Opening the throttle all the way then activates the choke unloader which opens the choke slightly to help clear a flood while cranking.
Thread Starter
Senior Member
iTrader: (3)
Joined: Sep 2006
Posts: 629
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From: Worcester
Car: 1984 Firebird T/A
Engine: 406sbc
Transmission: TH400
Axle/Gears: Moser 9"
Re: Choke sticking?
It's mechanical secondaries. Doesnt the secondaries open up the choke too? This was with the engine off and I was just flipping the throttle open all the way and the choke plate hardly moved.
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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
Re: Choke sticking?
No, the secondary lockout prevents the secondaries from opening while the choke is closed.
Thread Starter
Senior Member
iTrader: (3)
Joined: Sep 2006
Posts: 629
Likes: 1
From: Worcester
Car: 1984 Firebird T/A
Engine: 406sbc
Transmission: TH400
Axle/Gears: Moser 9"
Re: Choke sticking?
Well the primary and secondaries both open but the choke only moves a little bit. Not nearly wide open or completely vertical.
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