Norwich had not been winless in 14 games since April 1998 and looked in no mood to match that record as Forson and Sargent had early half chances.
Marcondes gave the hosts a deserved lead – having been unmarked at the far post from a corner the Dane’s first shot on the swivel was blocked, but Ruairi McConville was able to head it back to him and he blasted in low from six yards out.
But Norwich’s recent defensive frailties were on display soon after as Burrell equalised – the Jamaican got in front of his marker at the near post and tucked away Sam Field’s cross as the hosts failed to defend a corner.
However, they showed an attacking intent they had been lacking for much of the season as QPR goalkeeper Paul Nardi reacted superbly to palm away Kenny McLean’s 19th-minute defected effort.
City – who had failed to score more than once in a game since 20 September – made the game safe with two quickfire goals shortly after the half-hour mark.
Mbengue knew little about his own goal as McLean’s corner evaded the players at the near post and came off him three yards out, while Forson capped a fine flowing move from Oscar Schwartau, Marcondes and Sargent to make it 3-1 with a perfectly weighted curling left-footed effort.
The hosts locked down their opponents after the break as they gained more and more confidence.
Sargent thought he had made it 4-1 on the hour as he tapped in Schwartau’s cross from the left, but the Danish winger was adjudged to have been offside in the build-up.
Substitute Jacob Wright’s header forced Nardi into an excellent save 10 minutes from the end while he also stopped Shane Duffy’s header from the resulting corner.
