The game was only a minute old when Matty Robson latched on to a cross from JP McGovern to give Carlisle the lead over a Coventry side looking to extend a record of six away wins in a row.
Ninety five minutes of football later it was still the only thing separating the sides.
t was a huge improvement on the Blues last outing when they were beaten 4-0 by Swindon.
Liam Noble and Lee Miller both spurned chances to extend United's lead, while two shocking misses by Coventry's Leon Clarke will have been a bitter pill for away fans to swallow.
Carlisle are now 17th in League One, nineteen points above the relegation zone.
More top news
Paul Brand and guests discuss hard Brexit - and party discipline.
Milder - but at a price.
Volunteers from Lauder and Whitsome have been nationally recognised for their work 'to clean up and green up' spaces in their communities.