FAQ: How To Set The Choke On A Holley Carburetor?

How does electric choke work on Holley?

It’s designed to keep the engine idle speed around 1500 RPMs while the choke is engaged. When you start a cold engine and press the accelerator pedal to the floor, the fast idle cam activates and holds the primary throttle plates open a bit more than usual to raise the idle RPMs during the warm up.

Why is my Holley carb running rich?

If your engine is running rich and my mixture screws do not have effect: The first thing you need to check is your float level. No fuel should run from the sight hole unless you shake the vehicle. Next check the engine vacuum at idle. (in gear if A/T) if it is 12″ or more a 6.5″ power valve will usually be fine.

Should choke be open or closed when starting?

When doing a cold start, the choke should be closed to limit the amount of air going in. This increases the amount of fuel in the cylinder and helps to keep the engine running, while it is trying to warm up. If you are having trouble getting the car started in the morning, inspect the choke on your engine.

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How do you adjust a running rich carburetor?

Regardless of whether or not the engine is running too rich or too lean, bring it down to a very lean mixture by turning both screws a quarter-turn at a time, counter-clockwise, then slowly bringing them back up to an equal and smooth mixture.

How do you adjust a choke pull?

On a cold engine, most preferably in the AM after sitting all night. Hit the throttle to close the choke plate. Then apply vacuum to the choke pull off. and adjust the screw until there is 1/8th inch between the choke plate and the carb body.

How do you adjust an electric choke on a Holley carburetor?

For electric choke hookup, attach the bayonet end of the long electrical lead supplied to the positive terminal on the choke cap. The other end must be connected to an ignition activated 12-volt source. The distributor side of the ignition coil is NOT a 12- volt source. It is a 7-9-volt source after cranking.

How do you test a Holley electric choke?

Check from red plug to ground to be sure you have power first. Your photo shows the choke in it’s cold or closed position. When you work the throttle the fast idle cam (other side of the carb) should rotate into the fast idle position. Turn the ignition on and wait a minute..now work the throttle again.

What is the difference between a Holley 4150 and 4160 carburetor?

These two are very similar with the primary difference that the 4150 uses a thick metering block in both the primary and secondary while the 4160 is shorter in length and uses a thin, metering plate on the secondary side.

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How do you activate automatic choke?

How to Set the Automatic Choke

  1. Park the vehicle and shut off the engine.
  2. Raise the hood and lock it in place.
  3. Locate the throttle lever on the left side of the carburetor.
  4. Release the stopping arm and the throttle lever so that they both snap back into place.

How long should an electric choke stay on?

At 5°-10°C (41°-50°F), the choke plate should be fully open in about ten minutes. Check for bent choke linkage and a defective thermostat cap. And ensure the fast idle cam (screw) is properly set.

Can you adjust an electric choke?

The choke operation (opening and closing) can be adjusted by rotating the choke cap. Do not adjust the choke cap beyond the index marks or it will damage the internals of the electric choke unit. If the choke is opening too soon and is causing a difficult start: Loosen the three choke cap locking screws (see right).

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