Paul wrote:

> Before I grill I always turn it up on high for about 10 minutes
> to burn off the old grease. Every once in a while though, the
> grill flares up inside and keep going even when I cut off the gas.
> Needless to say I put the grill further away from the house.
>
> Is this just common to Webers? My old cheapy grill never did this.

My gas BBQ does it too. It's the grease burning off. You probably
notice it more when you have cooked something especially greasy. The
alternative is to leave it and have it flare up the next time you use
it.