Any Audio Video gurus out there in FABO land?

I decided to take my truck out for a ride and record it. well, every time I try and record my truck, the exhaust noise becomes a loud droning and makes all the audio sound like garbage and unusable. all you can hear is this vrrrrrrrrrr noise that makes everything sound like ****. even when I talk.:wack:
any ideas to fix this on my camcorder?