Crystal Palace slipped into the Championship relegation zone after losing 1-0 against Coventry.
Late goal earns Sky Blues victory at Selhurst Park
Crystal Palace slipped into the Championship relegation zone after conceding with five minutes remaining to lose 1-0 against Coventry.
Administration-hit Palace were undone by a late David Bell chip, although they had chances to take the lead earlier in the game.
However, Bell's strike saw Palace drop to 22nd in the table, a point from safety, while Coventry move up to 10th.
The visitors made a bright start and Carl Baker let fly from 25 yards but his shot was straight at Crystal Palace goalkeeper Julian Speroni who made a comfortable save.
Minutes later Aron Gunnarsson latched onto a flick from Jonathan Stead but fired a wild effort wide.
Palace eventually began to find their rhythm and Scannell was off-target with an effort from distance before Shaun Derry sent a shot over the bar.
Ambrose scored a superb free-kick against Aston Villa in the FA Cup last weekend and almost repeated the feat with a rasping free-kick from 35 yards that went just over.
Soon after Ambrose breezed past two challenges and his shot was fumbled by Westwood and trickled just past the post.
With half-time approaching Palace midfielder Nick Carle lost the ball in his own box and Michael McIndoe, who has yet to score this season, fired a point blank shot wide when he should have done better.
At the other end another defensive mistake saw Alan Lee round Westwood and tee up Ambrose but his shot was cleared off the line by Richard Wood.
Moments before the break Stead got a shot away from inside the box but Speroni made a superb save to keep the scores level.
Chance
Palace should have been in front five minutes after the break when Carle played an excellent ball into Ambrose but he scuffed the shot wide when he should have done better.
The home side were on top and Ambrose clipped in a wonderful ball to Johannes Ertl who headed goalwards but Westwood tipped the ball over the bar.
Ambrose was involved in everything positive from Palace and thundered another 30-yard free-kick just wide.
As the half wore on Coventry became more dangerous and a fumble by Speroni almost gifted them a chance but the Argentinean gathered at the second attempt.
Former Palace frontman Clinton Morrison was having a quiet game but with 15 minutes remaining his flick sent Gunnarsson clean through but he fired straight at Speroni.
Westwood made a superb save to deny Carle before Bell won it for Coventry with five minutes remaining.
Bell played a one-two with Stead and broke clear before producing a clever chip over the onrushing Speroni to send the visiting fans into raptures.
