I am driving a E90 320i, done more than 90K km in 2 years 9 months. Had fluctuating RPM in the past but problem resolved after multiple software upgrades and instrument cluster replaced. Was driving last night with air-con OFF for about 10 mins. Stop in a carpark in Neutral for a short while and the car started knocking and eventually engine stalled. Restarted the car and tried to simulate the symptom again. The engine RPM fluctuated between 600-900 but engine did not stall. Its not the instruments as the engine movement (knocking) can be felt. When I turn the air-con on, the RPM needle is quite stable.
I have not change the spark plug before, planning to do so around 100K. Do you think this might be the problem? I will bring the car back to PML since I have another 3 months of warranty left. Just need to learn more about possible causes before going in. Otherwise will have to believe all the stories they spin in front of me. Your advise will be much appreciated.
I have not change the spark plug before, planning to do so around 100K. Do you think this might be the problem? I will bring the car back to PML since I have another 3 months of warranty left. Just need to learn more about possible causes before going in. Otherwise will have to believe all the stories they spin in front of me. Your advise will be much appreciated.