Loud POP after Starting.
Hey guys, I have had a problem recently with a loud popping noise after I start my truck. This only happens after the truck has fully cooled down (most of the time thats overnight for me) and then I start it. The truck starts fine and has no problems getting started but then after I sit there for maybe 15-30 seconds there is a pop. It almost has the same tone as when occasionally the 4 wheel drive pops when disengaging but not as severe meaning I cant feel it in the seat. This pop happens regardless of if I am in park, drive, reverse, etc. I cant think of what this may be and again, it doesnt happen when the truck is warm and I start it. Any ideas?