Rattling/Backfire from Exhaust?
Ever since I bought my FX4 Scab, I have noticed that when I rev the engine after starting, at around 3500 -4 4000 rpm's or so the truck makes this horrible rattling noise I am not sure but I think it is in the muffler/exhaust, I took it to get looked at the dealership and the service advisor told me there where no problems, low and behold when I get home I do my own test and it happened again.
I will probably take it back and get the same answer. Any suggestions or reccomendations on what the diagnosis is? That way I have something to argue, for all I know they probably didn't even look at it. The sound is more annoying than anything, it only happens after I start the engine, I never hear it during driving. Any help is greatly appreciated.