The second flight was rescheduled for 11pm but was again aborted just before take off, the man wrote.
"This time the pilot was stopping in a hell of a hurry," he said.
"Engine number three had a problem - ironically it was near us."
In a written statement, Cathay Pacific acknowledged the incidents had occurred and apologised to passengers.
Spokesman Mark Pirihi said the A340 aircraft returned to the gate upon take off when the flight crew picked up an issue in one of the four engines.
"Passengers were given refreshment vouchers and were then reboarded after tests.
"At 7pm engine issues were still identified and the aircraft returned to the gate. Passengers returned home or were accommodated in local hotels although some passengers were able to be sent on other flights last night," Mr Pirihi said.
"The remaining passengers were rebooked on other airlines or departed on today's CX198 flight.
"Cathay Pacific regrets any inconvenience caused to passengers on yesterday's flight, but their safety is always our uppermost priority."