If it is inside the engine then it should certainly be flushed out. I suspect you are really noticing the anti-freeze in the webbing in the center of the motor. When you have leaks on top of the motor the anti-freeze collects in the webs and as it is evaporated it leaves a residue that looks like brown sand. Dry it out as much as you can and then suck it out with a wet-dry vacuum. In extreme cases it could corrode the block ruining it in the process. This is why you may have anti-freeze leaks and never see any on the floor, it has a large resovoir to evaporate in. Before you put the air intake back on finish the cooling system, pressurize to 15 psi for 15 min and inspect for leaks. It is impossible to see them under the air intake after it is reinstalled. David Teitelbaum vin 10757 --- In dmcnews@xxxx, Soma576@xxxx wrote: > hey everyone, > > i've had my fuel system, intake manifold, waterpump, and y-pipe removed from > my car since november, where it is sitting in a storage garage. i put duct > tape over the ports for the intake manifold, closed the engine covers, and > let it be while i have been waiting for parts and fuel system cleaning. > anyway, just the other day i was over there and took a look at some things in [Non-text portions of this message have been removed]