Idle Timing Is Strange?

[zoomzoom]

Heres a graph of my idle timing when warmed up. The graph is over 20 seconds and the timing is on the Y axis. From what I am seeing theres a whole lot of WTF going on here. Any thoughts?

[zoomzoom]

Upon reviewing my data those big peaks are throttle blips, so disregard them, but I am still curious about the constantly changing timing. I can hear the idle wavering, whereas I expected the timing to be roughly constant around 15 deg BTDC

Looking at the O2 sensor reading for the corresponding time, the voltage is all over the place going up and down with hardly any regular pattern. Does it affect the timing?

Edited October 17, 2010 by zoomzoom

[JonnoHR31]

whats it idling at? what ecu?

[zoomzoom]

Stock ECU, see the attached graph for the rpm over 15 seconds of idle. This is info Ive collected with a consult cable.

Edited October 17, 2010 by zoomzoom

[JonnoHR31]

try winding the idle screw in a bit. if its open too far the ecu will pull timing to try bring the idle back to where it should be

[blind_elk]

Looking at the O2 sensor reading for the corresponding time, the voltage is all over the place going up and down with hardly any regular pattern. Does it affect the timing?

It shouldn't. At idle, the volume of gas passing the O2 sensor is very small, so the ECU should ignore any information it gets from the sensor.

[Jezza-gtR]

O2 sensor only plays a part when idleing and when cruising. Get a timing light and check the the igntion timing. You may find the timing all over the place and you cant even adjust it correctly. You may find that the CAS is on its way out.