Paul Wotton's eighth goal of the season proved enough to secure the points for Plymouth and piled more misery on relegation-threatened Leicester last night.
Wotton fired home a free-kick early in the second half but, despite a valiant fightback, the Foxes were unable to find a goal to leave them still searching for a first Championship win of 2006.
The visitors were hoping to bring an end to a run of five league defeats against Tony Pulis's side, who were out to build on a morale-boosting 2-1 success at Crewe at the weekend.
The home side dominated from the start, with David Norris the first to test the Leicester goalkeeper Rab Douglas with a volley in the 10th minute.
After that, chances for either side petered out until seven minutes before half-time - and it was again Plymouth who were close to breaking the deadlock.
Wotton's header was tipped over by Douglas, before Capaldi's corner was cleared to safety by Nils-Eric Johansson.
However, Plymouth were ahead just two minutes into the second half when a foul by Patrick Kisnorbo on Evans presented the Pilgrims with a free-kick in a promising position.
Wotton, who had been one of the main factors for Plymouth's dominance in the first half, stepped up to fire an unstoppable shot beyond Douglas and into the back of the net.
Plymouth Argyle (4-4-2): Larrieu; Barness, Doumbe, Ward, Aljofree; Norris, Wotton, Nalis, Capaldi; Evans, Chadwick. Substitutes not used: McCormick (gk), Buzsaky, Hodges, Zebroski, Djordjic.
Leicester City (4-4-2): Douglas; Stearman, McCarthy, Johansson, Maybury (Smith, 57); Hughes, Gudjonsson, Wesolowski, Kisnorbo; De Vries (Hume, 70), Fryatt (Hammond, 70). Substitutes not used: Hamill, O'Grady.
Referee: A Woolmer (Northamptonshire).Reuse content