Does a 99 Plymouth Voyager 4-cylinder have zero tolerance engine?

No, a 1999 Plymouth Voyager with a 4-cylinder engine did not have a zero-tolerance engine. The concept of "zero-tolerance" engines, requiring absolutely precise clearances, really gained traction later in the development of automotive engines. While tolerances were always tight, the 1999 Voyager's engine design wasn't built around the extremely precise specifications associated with the term "zero-tolerance."