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In early July, I had a customer here in St. Louis report the same issue. He had the cap off and saw sparks shoot out the top and out the lower vent, accompanied by a loud pop. Turns out there was a rock inside that must have had some water trapped inside of it. The temp got hot enough, it boiled, and POP! When he cleaned out the firebox, he found the rock in 4-5 piece. Put back together, it had a hollow spot about the size of a grain of rice.
I thought he just got one of our special edition "4th of July" bags with the M80 hidden in it.
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"You’re not a real Texan till you’ve been kicked out of every decent state in America." - Joe Bob Briggs
LBGE, Mini BGE and R&V Fryer
How are the rocks getting into the Egg? Are they in the charcoal?
Yep, with the way lump is produced, they are unavoidable. We try to get as many as we can during the bag filling process, but a char dust covered rock looks just like a chunk of charcoal.
Sometimes they are encased in large charcoal chunks since the tree grew around them--same goes for bullets, nails, arrowheads, piece of barbed wire, etc. The only other thing that occasionally slips by is metal banding--used to bind the slabs together for shipping to the plant.
Give the lump manufacturers a pass on all of that stuff. Concrete, insulation, soda cans, plastic, etc are another story though.