530i (E39) Rough Idle/Stalling
Folks, I need some diagnostic help, and so does the car.
I've a 2002 530i that idles poorly and stalls at traffic lights. Actually, I've not experienced the stall but my wife has several times. I will attest to the rough idle. I used my Peake scanner and I get two major codes:
1. O2 Adaptation Limit
2. O2 Sensor Control Limit
There are a series of misfire codes for all cylinders but I thing these are the result or symptomatic of the above two.
Also, there is a sharp metallic or clacking sound underneath the intake manifold that is periodic. Sounds like a very loud soleniod action or perhaps a backfire.
The car has 120K on it so I've recently replaced all four O2 sensors and the plugs. Recently I found the rubber vacuum line to the Secondary Air Diverter Valve cracked so I replaced it and traced it back and replaced at the opposite end as it was also deteriorating.
I've also put a new throttle body on the car for another issue.
I really need some help with this. Thanks I appreciate it and so will my wife as she is now driving the old cherokee and wants the 5'r back.