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The Sky Blues struck all of their goals in the first 45 minutes, piling more pressure on Argyle boss Rooney with his side now two points adrift of safety after 22 games. 

Tatsuhiro Sakamoto headed Coventry in front with just five minutes gone, before the recalled Josh Eccles rifled the ball beyond Daniel Grimshaw from the edge of the box. 

Ephron Mason-Clark, who had set up Eccles for the opener, netted his fourth goal in his sixth game under Lampard with a fine finish to put the result beyond doubt. 

Eccles then completed the first-half rout just before the interval, with Plymouth's misery compounded late on when substitute Callum Wright was shown a straight red card.