Piltz turned professional in 1989 and played on the Swedish Golf Tour.

He then joined the Challenge Tour, where he was runner-up at the 1992 Volvo Finnish Open[1] before winning the 1994 Volvo Finnish Open, following a playoff with Joakim Grönhagen.

[2] The win earned him an invitation to the 1995 Sarazen World Open at Chateau Elan Legends course in Braselton, Georgia.

He made 11 starts and 5 cuts on the 1994 European Tour, finding himself back on the Challenge Tour, where he was runner-up at the 2001 Russian Open behind Jamie Donaldson.

Piltz represented Finland at four World Cups (1991, 1992, 1994, 2000) with a best finish of 21st together with Kalle Väinölä in 2000.