Carb Issues
03-25-2017, 06:14 PM
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Carb Issues
I have recently purchased a 85 Z28 with a 350 engine swap. It had a 750 carb on it but it was to much and couldn't get the idle down. I have a holley 600 CFM carb with electric choke. When I put the carb on my engine, it idles at 3,000 rpms. I have checked for vacuum leaks and have found none. When I open the choke flap fully open, I can get it to idle normal. If I rig the flap open it is good, but I want to know why! I know that is not right and I want to know how to fix this the right way. Anyone know about this?
03-26-2017, 11:57 AM
#2
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Re: Carb Issues
Sounds like you need to adjust the electric choke; what 600cfm carb are you running?
03-26-2017, 01:14 PM
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Car: 87 firebird 86 c10 90 mustang
Engine: 383 sbc
Transmission: 97 t56
Axle/Gears: Moser 12 bolt 3.73
Re: Carb Issues
If you don't have power to the choke or don't want to run power if it's not there you can loosen the 3 screws on the choke and turn the plastic part. That will turn it off mechanically for good.
03-26-2017, 08:49 PM
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03-29-2017, 07:25 AM
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Car: 1990 IROC
Engine: Rebuilt L98 with H/C/I/Carb
Transmission: TH350 with ATI Treemaster
Axle/Gears: 7.5 with 4.10's
Re: Carb Issues
You had a 750 on it, and you couldn't get the idle down. Then you put a 600 on it and can't get the idle down. I am guessing it is not the choke. Check the basics: Is the throttle cable holding the throttle blades open (and off the idle adjusting screw)? What is the base timing advance at idle (with vacuum advance hooked up)?