When ever I turn my key to the on position you hear this sound like, a muffled aersol spray can or some sort of air / liquid spray. This may not be describing it right but thats what it sounds like.It has done this since the day it was new, for all I know they all do it. My problem is, the other day it did it for about 8 or 10 seconds. Usually it only does it for 1 or 2 seconds...what the hell is this sound! engine runs fine and has no problems.

 

sounds like your fuel rail pressuring up.

 

What would make it spray a long time? maybe a bad fpr. I put new injectors on it last month but not the cold start injector. maybe the 9th injector is bleeding it down.

 

that I don't really know, maybe some other memebrs could help you with this.