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Re: backup over a stump and now something under my car...
Most likely the exhaust like is deformed and one of its bushings has been ripped apart - must be completely replaced, it will be expensive. Take the car to a shop, this isn't something that you can do on your own in the backyard
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Even though it sounds like it is under the armrest I would suspect the noise is a exhaust system heat shield that has a broken tack weld that is the source of the noise, raise the car off the ground and with a rubber mallet tap the exhaust heat shields, if you find a loose one buy a large band clamp (avail at hardware stores) and put it around the heat shield and tighten it up, the noise will then go away.
Diagnosing something from a description is far from an exact science, but this is what it sounds like to me may have happened. If your battery was not tie down it could have gotten against something hot or moving (like a pulley), or what ever was rattling may have created a spark somehow and caused the battery to exploded, either way the battery fluid spashing onto hot metal could explain the cloud of white smoke, as you did not mention seeing any flames.
Sorry for the late reply but, no, it is not related to a loose heat shield. It is a louder rattling sound more like a loose bearing vibrating inside either the transmission or the clutch assembly. Only between 1600 and 1900 rpm. and it is not present under ou over these rpm. The rattle desappear when I lock the 4X4. Dealer is out of solution!!
If it's a twist bit try putting a vice-grip pliers on the end and turn it so the fluting pushes the bit out. If it won't move or if it's a spade bit you'll have to split the wood around the bit. You may or may not be able to do this with the offending part of the stump in the ground. Using a wedge, drive it into the stump near but not next to the bit so you don't damage the bit. Don't drive the wedge flush into the stump or you may get the bit out and then have the wedge stuck. Worst case, carefully use a chainsaw to cut out the stump so you can split the wood around the bit.
Check for loose heat shields the cover the exhaust. I find this is the source of many rattles. They are made of sheet metal and if they are not clip or tightened down the low vibration frequency when the car is running at slow speed will cause them the hit the exhaust pipe/ front mainfold.
If radio stays on at low or no volume and cuts out when turning up you may have your battery backup voltage (yellow wire) droping below 10v under signal load. There is a circuit called backup check in radio that moniters Voltage It may seem ok when measuring without volume but under load it will fluctuate with the audio. Try hooking up Heavy guage Ground and Backup battery wires to prevent voltage loss across wires under load. Also check for any speaker that may not be producing proper sound when and if you can get radio working Disconnect wires to that speaker to see if radio will stay on. Just a couple of many possibilities. firstname.lastname@example.org