Edelbrock 3550 User Manual page 29

Idle Calibration Procedure
• Prior to idle calibration, you need to have completed the "System Start-Up" procedure
• Warm up engine to at least 175°F.
Idle Control
• Using the calibration module, Select MISC. MODIFIERS and, Set Idle Control OFF.
Set Idle Mechanical Stop
• Set the mechanical stop screw so that idle speed in park/neutral is 50-100 RPM higher than you want the engine to actually
idle in gear with the idle control turned on. Typically 600 - 1000 RPM depending on the installed camshaft.
• We find 650 RPM a good idle for our #3531 (with Performer-Plus camshaft) calibration.
Set Throttle Position Sensor
• Loosen the two Throttle Position Sensor (TPS), mounting screws, and rotate the TPS sensor to a setting of 13 degrees as
observed on the Calibration Module. This setting must be at 13 degrees after the idle adjustment is completed.
Set Idle Fuel Modifier and Idle Spark Modifier
• Using the calibration module, Select MISC. MODIFIERS and adjust Idle Spark and fuel Modifiers to obtain best idle quality.
Idle quality will vary with engine design. Fuel and Spark setting will interact, particularly when you approach best settings.
• You must establish a smooth idle prior to using Idle Control. Otherwise, the RPM will surge when Idle Control is turned on.
Save Calibration
• Re-check that the TPS setting is 13 Degrees.
• Using the calibration module, Select MISC. MODIFIERS
• Set IDLE CONTROL ON. Set TARGET IDLE to the same RPM established by the idle stop screw.
• Save calibration settings to "A"
Idle Speed Activity
• Displayed on the calibration module, (Second Data Screen). The displayed value represents the amount of air that is
bypassing the throttle blades of the air valve, Normal values range from 5% to 75%. This ensures that the computer can
increase or decrease the idle air flow to control idle speed.
• If your have established a "good" idle set up, the RPM will remain nearly constant between in-gear and out-of-gear. The Idle
Speed Activity will change 10- 30% as it adjusts the idle speed.
• The value of Idle Activity is 20% when Idle Speed Control is off.
Idle Speed Activity Modifier
• This function is locked out when Idle Control is off as indicated by "XXXX" in the Target idle display on the Calibration Module
Display.
• The Idle Speed Activity Modifier biases the Idle Activity duty cycle, +/50%, this has the effect of changing RPM control loop
response time.
• We recommend that this value be set to zero modification except in extreme cases.
Rev. 10/05
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Pro-Flo EFI Installation Instructions
©2005 Edelbrock Corporation
Brochure No. 63-0115