Anyone else experience this?

2004 F150 XLT SCab, w/ 4W ABS. When I'm at a traffic light, foot on the brake and tranny selector in drive, there is an intermittent buzzing noise by the left front wheel. Other than the buzzing sound no other symptoms of anything going wrong. Stops ok!

Thanks

 

It is probably one of the heat shields over the cats.... they are famous for rattling.. get under there and tap it, see if it moves at all.... mine did it,,, and I got most of it to stop by bending it a little

 

I just noticed mine doing something similar at idle.... I tracked it down to the PCV valve in the valve cover. Not sure if a replacement will take care of it or not, but I'm not worried.

If it only buzzes once you've stopped, it's not a brakes issue.

-Joe