I have an 04 Disco II with 4.6. I have replaced plugs, wires and coils. I keep getting codes of random misfires on #3,5 and 6. also the code of both first bank O2 sensors keep coming up as well. You can feel the misfires at idle. But when traveling down the road is feels pretty smooth.
When we first start it in the morning, it will idle pretty high around 2500 RPMs or it will rev up and then try to stall out. This is only during a cold start. After about 30 sec to a min, it will straighten out.
Does anyone have any idea what I can check to get her running and idling smoother where these codes don't come on. Also is the O2 codes being thrown due to the misfires?
When we first start it in the morning, it will idle pretty high around 2500 RPMs or it will rev up and then try to stall out. This is only during a cold start. After about 30 sec to a min, it will straighten out.
Does anyone have any idea what I can check to get her running and idling smoother where these codes don't come on. Also is the O2 codes being thrown due to the misfires?