I bought this car back in October. Within a day it started rattling. The rattle is intense and can be felt in the pedals and gearshift. No mechanic can figure out what it is. It has an aftermarket exhaust but everything seems tight and secure. I have replaced the passenger side motor mount, the torque strut mount and the transmission mount under the battery. A mechanic also went under the car and tightened down almost everything he could find. The problem has definitely improved but it’s still there. The rattle usually occurs when I’m driving at high speeds, usually around 60mph. As I accelerate to speed it’s smooth, but when I take my foot off the gas and place it back in lightly to coast the noise begins. Sometimes it works itself out, but other times I’ll park and still hear a light, almost squeaky type of rattle. It feels like something is just loose and touching where it shouldn’t, but it’s driving me crazy! Are there any other motor mounts that might be the cause? Does it just sound like something’s loose?
[Rattle noise 2005 vw jetta with aftermarket exhaust - YouTube]
Please help