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I have a very low pitched knocking sound coming from my engine at idle. It doesn't seem to be there when the car is first started in the morning, but slowly appears after driving for a few miles. It's loud enough to be heard inside the car while at a stop light, and sometimes while standing...

Hey guys I have a slight knocking sound at idle. It speeds up as you rev the engine, but you can't really hear it over 2500 rpm. I took it to the dealer a few months ago and they claimed it was caused by the high pressure fuel pump and it was normal. Can anyone else with an MS6 or MS3 verify...