Hey so i have a 02 Expedition eddie baur with the upgraded mach system as well as 2 12's with a 1000watt kenwood. Today i randomly turned on my truck and i have 0 bass from my subs (amp is on) and 0 bass from my actual speakers and 0 bass from the stock 8" sub. So... any ideas as to why i have NO BASS AT ALL in my truck? Any suggestions would help!!!!!

Side note: My battery has been on its way out and im going to be getting a new one probably later on today, think that would have anything to do with it?

 

Can the oil pan on a 1997 F150 4.6 be removed without pulling the motor?