rattling question?

Location
Ontario/Inglewood, Cal
Car
2005 FX35
u know wat iv'e been hearing some 1sec rattling noise when i start my car sometime's in the morning when it's cold not sure wat it is but only sometime when my car is cold i start it and like a weird rattling noise for 1sec i think under the hood weird!
 
ive noticed that when you first start the car it sounds different at first. i think it revs up a little higher before dropping down to idle, so the frequency could be making something rattle just for that time period. might want to pop the hood and have someone start it while you listen.
 
I haven't, here's a tip for cold startups. Warm it up until the RPM is down to 1000 RPM, then drive.
 
all of you i believe you ae hearing the ABS CHECKING the computer system its suppose to do this periodically at cold start . if you have any other questions you can call me at metro infiniti 626 599-7528
 
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