Hi,

I have a four-cylinder chevy that I let sit for a year.

When I fired up the engine, there was this tremedous
engine knock that sounded as if engine failure was
happening.  So I turned it off and cursed my bad luck

Six months later my land-lord tells me I have to move
my li'l undriveable piece of junk because she has to
tar the parking lot.  This time I fire up the mutha and
discover an engine knock that almost disappears
when you throw it in gear.  What happened to fiendish
engine noise?