Steps to adjusting the electric choke and high idle settings on your BluePrint Engine's Holley Carburetor
CHOKE ADJUSTMENT:
IMPORTANT: Your Holley® carburetor has been factory wet flowed and calibrated. The “out of the box” settings should be very close for all adjustments. The following tuning section is included ONLY to aid you in fine-tuning adjustments.
Electric Choke
1. You can control the choke operation by rotating the choke cap. If the choke comes off too soon, loosen the three screws and rotate the cap counterclockwise one notch at a time, until the choke operation is satisfactory. If the choke comes off too late, rotate the cap clockwise one notch at a time, until the choke operation is satisfactory. The choke setting from the factory is on “index” or at center position. After making the final adjustments, start the engine and make sure the choke plate opens completely.
A. A choke that comes off too soon could exhibit one or more of the following symptoms: stalling, surging, backfiring, stumbles, or poor vehicle driveability when the vehicle is cold.
B. A choke that comes off too late could exhibit one or more of the following symptoms: black smoke from the tailpipe, poor driveability when cold, poor gas mileage, misses, or rough idle.
Manual and Electric Chokes
2. If the fast idle RPM is too low or too high for your preferences, SHUT DOWN THE ENGINE! Advance the throttle to wide-open, exposing the fast idle set screw below the choke housing (Figure 7).
3. Using a 1/4” open-end wrench, turn the screw clockwise to increase the RPM or counterclockwise to decrease the RPM. The factory setting should give you a 1500-1600 RPM fast idle speed.
NOTE: All vacuum ports must be plugged at this time.