I think pre-flop the call is generally bad, but if the table was loose-passive pre-flop, but tight-passive post then it could be good.
As for the flop call, again depends on your opponent.
For arguments sake let's say their range pre-flop is
99+, AJ+, KJs, KQo
Another assumption I will make is that the opponent will check-fold any non-ace / non-set hand on the turn, but will show-down with any ace or set.
In this case they'll hit the flop around 40% of the time. If we boost this up to about 50% for the turn then it is marginally bad to float, except for the times when we get to stack our opponent.
The equity of this alone is approximately:
0.08 * 0.5 * 85 = +3.4BB
E.g. the value of calling to hit a 9 on the turn for when they have a made hand is worth 3.4 big blinds
In a nutshell if you think your opponent would have a stronger range than that outlined or if they are "sticky" (float plays generally don't work on them) then it's a bad call.
Otherwise, it's a good call!