Johnnie Jackson grabbed a stoppage time equaliser for Coventry to make it six consecutive draws for the Sky Blues and preserve their 13-year unbeaten record against Crystal Palace at Selhurst Park.
Palace loan signing Rob Edwards had given the home team an early lead but their late goal leaves Kit Symons with just one win and three draws as caretaker manager.
Andy Johnson had the first real chance of the match after a through
ball from Dougie Freedman deflected kindly into his path, but Coventry
goalkeeper Gavin Ward turned his effort around the post.
Edwards struck the opener from the resulting corner, Tommy Black finding him unmarked at the far post for a free header.
Black could have added to Palace's lead twice before the end of the first
He hit a shot on the turn which Ward spilled to
Freedman, who then wasted the opportunity that had fallen his way.
Shortly afterwards Black forced another fine save from Ward
with a shot from 15 yards out.
Shaun Derry was guilty of an even worse miss in stoppage time, missing the target after being put clean through.
Freedman wasted another chance when clean through on goal after 59 minutes.
And Palace were looking comfortable until substitute Jackson hit the target from
eight yards from a Micky Doyle cross to snatch a point for Coventry.
Crystal Palace: Myhre, Fleming, Popovic, Edwards, Derry, Black,
Hughes, Butterfield, Borrowdale, Freedman, Johnson. Subs:
Berthelin, Granville, Symons, Watson, Routledge.
Coventry: Ward, Warnock, Pead, Davenport, Konjic, Safri,
McAllister, Doyle, Joachim, Adebola, Morrell. Subs: Shearer,
Whing, Suffo, Staunton, Jackson.
Referee: M Warren (W Midlands).