I have searched My 2000 blazer LT 4x4 over for this rattle and I cannot find it. From 0-30 mph no noise , from 35-45 (sometimes a little higher) I get this rattle from sounds like passenger fender area.. Usually above 50 I hear nothing. I have taken everything off the inner fender from the blower motor to the headlights .. including the blower motor itself (needed changed) . The PCM had some up and down movement so when I put everything back together I put some rubber under it ..Wasn't the noise it is still there. I have replaced the whole front end except the control arms . New ball joints, tie rods, idler, hub assemblies cv axles, brakes, rotors sway bar bushings, links. New shackles , shocks , calipers, brakes on the back and new brake line from front to back. I also did the hood hinge fix .. What on earth am I missing to stop this annoying rattle ?

 

Break pads rattle. Lightly touch the break pedal when you hear the noise. If it stops....

 

Not the brakes .. It makes the noise braking, accelerating, turning, up hill, down hill ... I haven't tried a wheelie or 2 wheels yet but every other way the noise does not change. I noticed today that occasionally I can hear it a interstate speeds as well . I thought this morning I found the problem the bottom bolt at the back of the passenger tire on the inner fender well was loose . The big washer would spin and rattle .. tightened it.. didn't help. I'm off work the next 2 days ..some serious searching gonna happen.