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Hello, First off I have made sure to do an extensive length of research to make sure I wasn't re posting an old thread. I have a strange occurance happening I have a very odd knocking sound coming from my engine but it is un like anything anyone has ever heard before on the forums. It is a metallic slow tick that is only heard at idle. The weird thing is the moment I open my oil fill cap my engine chokes and the idle gets slower and the ticking stops. Please Help, any help or input is greatly appreciated


Additional info: the noise does stop after long road trips until the engine gets cold again. Also the noise was not present right after I changed my valve cover and my oil to 5W 30.

http://www.youtube.com/watch?v=tXUHqo5KcFA
 
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