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The symptoms described above are what I get with my vehicle. I thought the time after startup, until the surging occurs, is significant . Sometimes leaving work, I start the car and drive off immediately. Then other times I may have forgotten something and so I go back inside work and invariably, when I return to the car, the engine is surging. I haven't carefully read all the posts above. However, I thought I read somewhere (not here) that the engine airflow is controlled by the butterfly in the throttle body on start up until such time as the car warms a bit and then it switches to Vanos/Valvetronic control and then the throttle stays wide open. If this is correct, then maybe it is that transition period where it is switching over that causes the surging ? I've had my car checked for everything with many parts swapped and replaced. However the mechanics are still scratching their heads. Can anyone confirm the operation of the throttle body viz-a-viz what happens at cold start and after warm up ? |
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idle, jumpy, lunge, surge, throttle |
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