check raised on the turn (few outs)

[Mathieu]

Here I have no specific read on villain(who limped in MP2), he hasn't been involved in a lot of pots and appears to be playing reasonably tight and somewhat straightforward. At least I haven't seen him do anything crazy.

Overall the game is loose passive.

Paradise Poker 1/2 Hold'em (10 handed) converter

Preflop: Hero is Button with K[img]/images/graemlins/spade.gif[/img], J[img]/images/graemlins/spade.gif[/img].
<font color="#666666">3 folds</font>, MP2 calls, <font color="#666666">1 fold</font>, CO calls,
<font color="#666666"></font>, <font color="#CC3333">Hero raises</font>,
<font color="#666666">1 fold</font>, BB calls, MP2 calls, CO calls.

Flop: (6.50 SB) 9[img]/images/graemlins/heart.gif[/img], J[img]/images/graemlins/heart.gif[/img], 5[img]/images/graemlins/diamond.gif[/img] <font color="#0000FF">(5 players)</font>
BB checks, MP2 checks, CO checks, <font color="#CC3333">Hero bets</font>, BB folds, MP2 calls, CO folds.

Since I don't have much notes on MP2. I figured he could be calling me with various hands here.

Turn: (4.25 BB) A[img]/images/graemlins/diamond.gif[/img] <font color="#0000FF">(3 players)</font>
MP2 checks, <font color="#CC3333">Hero bets</font>, <font color="#CC3333">MP2 raises</font>

Now I am most likely behind unless my opponent decided to get fancy and semi-bluff that scare card (he might have improved to a better draw).

If behind, I have very few ways to improve: 4 outs vs nut flush draw, and 2 versus Aces up.

At that point, the pot is laying me 7.25 to 1. Clearly not enough if I am behind, but there is still a small chance that MP2 is making a move, plus meta-game considerations.

Against a wild opponent this would be an easy call, but against someone who has been relatively quiet so far should I still call down, or call the turn and fold the river unimproved?

I would like to know how you guys deal with this problem.

Thanks!