1997 Mercedes Benz 320e

Engine Performance problem
1997 Mercedes Benz 320e 6 cyl Two Wheel Drive Automatic 117000 miles

hey my benz when I start it runs fine. Then after about 30 min. I here a knock like a rod or something. Then it may go away for a while, then return. Is there an oil or fluid I can try to stop it. Also I jammed my breaks in the rain and my abs and ets lights popped on and wont go off. Whats going on there. Thanks for your feed back.
July 28, 2010.

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