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Carburetor

Install Edelbrock Carburetor 1406
by Autoshop Videos

• Idle speed screw sets normal idle speed

• High speed idle setting for idle speed on a cold engine

• Air Fuel Mixture screws controls air/fuel mixture at idle only

• Center port – manifold vacuum signal for PCV valve

• Manifold valve on back is for brakes or other systems. Plug if not in use

• There are two vacuum ports on the front of the carburetor, the higher and left one is for the distributor. It is the partial or times vacuum port

• The port in front and on the right and slightly lower is to connect to the automatic transmission. Cap if not using

• Check to see if the distributor uses ported or manifold vacuum. The manifold vacuum will feel strong if finger is placed over port. The ported vacuum will have a gentle vacuum.

• Adjust air/fuel mixture screws

  • Effect the idle only

  • When engine is running, turn screw in (cw) until you hear the idle drop. Then, back out one quarter to one half turn out (ccw). This is the more economical setting.

  • Following the preceding directions for the other air/fuel mixture screw.

  • If you want a richer mixture, screw the sir/fuel mixture screws out (ccw) until the idle start to get rough. Then turn the screw in (cw) one quarter to one half a turn.

  • Following the preceding directions for the other air/fuel mixture screw.

  • After adjusting air/fuel mixture screws, adjust regular idle screw.

• For more adjustment, loosen the screw over the small plate that holds the metering jets. There are two of them.

• To take the top off remove the two clips on the side

• Use a T25 torx bit and remove the screws on top\

• Adjust float level to 7/16 at the center using a drill bit

• Use the manual to switch the jets as directed.

• Adjust the electric choke

  • Loosen the three screws on the choke housing

  • Turn the choke cap ccw to make it leaner, the butterfly valve should be shut and just closed with a little movement

  • Next, adjust the fast idle screw found under the main idle screw. Adjust idle speed when choke is on.

  • More idle turn cw, less idle turn ccw

Trouble shooting Edelbrock Carburetor 1406
by Autoshop Videos

• If adjusting the idle screws have not noticeable effects, try cleaning the idle screws with a blast from an air gun

• If you can’t set the idle low enough, try the idle screw then the high idle screw.

• If you have erratic idle, check for a vacuum leak. Spray carburetor cleaner around the carburetor checking to see if it gets sucked into the base of the carburetor and the idle jumps.

• If you are getting sputters under load, lean under load, it may be a punched fuel line, dirt in the line, or fuel pressure is to low.

• If you are smelling fuel (fuel leak) it could be fuel coming out of the vent at the top of the carburetor. Maybe the fuel pressure is too high. It should be about 6 lbs. but not over 7 lbs.

• If you have an erratic idle and/or high idle – check to see if the vacuum advanced hose is on the wrong port. The low port on the front of the carburetor is for the manifold vacuum and it will have a strong pull when a finger is placed over the port. The higher port on the front of the carburetor is for the timed vacuum and it will have a weak pull when a finger is placed over the port.

• Engine idles high. Check rear port, it should be plugged or used.

• When petal is pushed, the engine hesitates. Adjust the pump connected to the linkage. It has three holes on the linkage and is the accelerator pump.

• Off idle surge. If the engine wants to surge when coming off idle, adjust the idle mixture screws.