Carl Cort and Paul Ince both went close and Scottish international Kenny Miller saw his effort cleared off the line as Rangers held firm.
Jeremie Aliadiere had a good chance towards the end but fired straight at Paul Jones.
Wolves manager Glenn Hoddle:
"It's been a decent day. Crystal Palace lost and we play Cardiff next week, so we're still in the driving seat.
"The disappointing thing is that if we had won we'd have been in the top six and that would put Preston under pressure.
"We had chances to win the game and I feel we should have done so."
QPR: Jones, Bignot, Shittu, Rose, Milanese, Ainsworth, Langley, Bailey, Cook, Gallen (Youssouf 63), Furlong.
Subs Not Used: Thomas, Santos, Kus, Baidoo.
Wolverhampton: Postma, Ross, Lescott, Edwards, Naylor, Anderton (Kennedy 72), Ince, Cort, Davies (Ricketts 76), Miller (Frankowski 90), Aliadiere.
Subs Not Used: Oakes, Lowe.
Booked: Miller, Ince.
Ref: P Armstrong (Berkshire).