Fast Idle Cam Breaker
07-29-2010, 04:46 PM
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Fast Idle Cam Breaker
Where does the FICB vacuum connect to? Every vacuum diagram ive looked at doesnt include it. This is on a california truck btw. Please help!! need to pass smog soon!! thank you
07-29-2010, 05:31 PM
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you mean either the choke opener or idle up diaphragm then? no such thing as a Fast Idle Cam Breaker which is probably why you can't find it in the diagrams.
Last edited by xxxtreme22r; 07-29-2010 at 05:34 PM.
07-29-2010, 05:34 PM
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i found it in a couple diagrams. it just doesnt show where it connects. is the chock opener right above the idle adj screw? maybe theres just diffrerent names for the same part...
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08-02-2010, 06:23 PM
#9
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The choke breaker is not responsible for disengaging the choke, but it does creep it open a few degrees right after start up to minimize emissions (the truck "pollutes" more when the mixture is richened up).
If you downlaod the factory service manual via miy signature for a 1985 22R it should have that diagram. You really have to read closely because certain hoses might disappear behind another hose.
All I can recall (I have a Weber now) is that the choke opener plugges into one of the palstic Thermo-operated vacuum valves closest to the head... a little further forward of the opening diaphragm. The other tip of the existing vacuum valve must be supplied vacuum. So when the valves gets hot from the coolant beneath it, it allows vacuum to be connected to the diaphragm... thus BREAKING the FAST IDLE CAM.
Which is why you would be correct in naming it the FICB.
If you downlaod the factory service manual via miy signature for a 1985 22R it should have that diagram. You really have to read closely because certain hoses might disappear behind another hose.
All I can recall (I have a Weber now) is that the choke opener plugges into one of the palstic Thermo-operated vacuum valves closest to the head... a little further forward of the opening diaphragm. The other tip of the existing vacuum valve must be supplied vacuum. So when the valves gets hot from the coolant beneath it, it allows vacuum to be connected to the diaphragm... thus BREAKING the FAST IDLE CAM.
Which is why you would be correct in naming it the FICB.
08-02-2010, 06:29 PM
#10
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Ok, I just looked at your bottom diagram. Its a BVSV valve... forgot what the B stands for but its B-something Vacuum-Switching-Valve. So it'll be one of the plastic valves with 3 ports and it looks like it shares that valve with the AAP (Auxilary Accelerator Pump). The AAp is a diaphragm on the front "driverside" of the carburetor. It's not a separate diaphragm... the actual housing is part of the carburetor. Anyway, track your hose from the AAP to it's plastic VSV and your FICB (choke opener) will plug into that valve as well.
Happy hunting.
Happy hunting.
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