AU XR8, Series 3

[Edxr6]

Originally Posted by undertow

No harm in trying swapping them around, they're nice and easy to get to.

I wonder if the idle issues are caused by the ECU trying to learn around the dead coil? There are idle airflow trims which "learn" the adjustments required to get the idle speed where it should be. With a dead coil the idle speed will drop, then the ECU will increase idle airflow to try and compensate, and eventually learn this correction. Then with a new coil it will idle too high until it learns back down (which can take a while). Try disconnecting the battery for a while to reset things.

That's what I thinking, possibly the ECU trying to adjust to the new coil packs. I must admit driving the car every day since last Friday, there is improvement with the idling. However I will disconnect the battery over the weekend as suggested. I think your on the money undertow.

Cheers mate.