Rattle only in gear

[zach1288]

I'm hearing a rattle that sounds like metal BB's bouncing around in a metal can, that's the best way I can describe it. I only hear it when in gear at a drive-thru or against a wall. It only happens when idling, if I move the gear shifter into park the sound goes away. I climbed under the truck and none of the heat shields seem to be loose. Any other ideas?

Thanks.

 

[Morphyne]

It is a heat shield. it has to be. bc you described the exact situation that happened to me (metal bb sound, only in gear, very noticeable in drive throughs) . for me it was the drivers side UPPER heat shield on the exhaust. check the heat shields between the exhaust and the underside of the body.

 

[Elan750]

yup same here, whae he said.

I also got it when the muffler started breaking apart and the muffler pipe was hitting the frame.

 

[Inv4drZm]

Yes, probably an exhaust issue. The FJ did it during high idle when the exhaust was barely rubbing a skid plate. Mine did it for the same reason I think.

 

[DEF4Runner]

I had this exact issue a couple years ago. I checked all the heat shields and, although a common culprit, mine were solid. It turned out to be a clamp on the back side of the converter that rusted apart at the bolt and started 'dancing' around on the pipe.