Idle control not consistent

[Bob Pendleton]

[attachment=0]CurrentTuneTroy10-11.msq

MS Format 0262.06.
1968 Mustang with Ford Racing crate motor, 5.0 L 306 ci, aluminum heads, GT 40 intake, Hooker headers, dual wide band O2 sensors, coil on plug, 26 lb/hr matched injectors, full sequential fuel and ignition, Ford 303E degreed cam +2 degrees advance, T5 5 speed with 370:1 9 in rear.
At idle, A/F reads 18.2 - 18.6 and CO is at .85. If A/F reads 14.7- - 14.8, then CO reads 5.85.

Question: Is this because of the cam?

Msq attached, datalog was too large.

[elutionsdesign]

You sure the A/F is reading correctly? Which wide band(s)?

[Bob Pendleton]

Widebands are Plex controllers and sensors.

Zip file attached is datalogs.

[Matt Cramer]

Idle AFR looks correct in the data log; I am not seeing the lean readings you describe. Try setting up the idle ignition advance table with a flatter layout, but with extra advance added in about 200 RPM below your target idle speed. That often stabilizes it.