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I am new to the 350 gas engine. The car is still brand new under 300 miles. Sometime I hear rattling noise that goes away within 2 seconds on start up. as it goes away the rattle slows down. It happens randomly regardless of cold/warm engine . I experienced it a few times now, most of the times the car starts up it is not there. Any ideas...
 

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'01-E320 & 02-ST2
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If it is just a light rattle from under the hood that is probably the purge valve doing it's job, normal and nothing to worry about. Part of the emissions (evap) system.

Take care and enjoy the ride,
Greg
 
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