Lee Williamson was the match-winner, turning in Jobi McAnuff's cross in the 56th minute to ensure the points.
Adrian Boothroyd's side, who have already beaten promotion hopefuls Wolves, are now the only team in the division to win both of their opening fixtures.
Crystal Palace are among the chasing pack on four points and they drew at home to Leicester, with Clinton Morrison grabbing a last-gasp equaliser to make it 2-2.
Stuart Green scored first for the Eagles before they slipped behind to strikes from DJ Campbell and Patrick Kisnorbo. Morrison then hit back in injury-time to take a share of the spoils.
Coventry have also won one and drawn one following their 1-1 finish with Hull. Leon McKenzie (51) put them ahead after a goalless first-half but it took former England player Nicky Barmby just 10 minutes to reply for the Tigers, who had Samuel Ricketts dismissed after 68 minutes.
West Brom collected their first points of the season with a 2-0 home win against Preston, who could not shake off the ignominy of their Carling Cup defeat to Morecambe.
Kevin Phillips (65) scored after a tight first period and new loan signing Ishmael Miller made it two six minutes later.
Newly-promoted Scunthorpe followed up their opening-day draw with a first win of the season, beating Burnley 2-0 at Glanford Park. Martin Paterson grabbed the first, converting two minutes after the restart and midfielder Jim Goodwin doubled the advantage after 64 minutes, firing home from the edge of the box.
Veteran striker Teddy Sheringham scored the first goal of his Colchester career as the Us shared four goals with visiting Barnsley.
The 41-year-old scored on the stroke of half-time to equalise Brian Howard's penalty before Matthew Connolly put the hosts in front.
Howard then hit back to make it 2-2 with a second penalty with five minutes remaining.
Big-name signings Robbie Fowler and Jimmy Floyd Hasselbaink may be about to grace the Cardiff side but it was Paul Parry who ensured they came away from QPR with three points.
Parry slotted home following good work from Glenn Loovens in the first half before doubling his tally with a headed effort after 58 minutes.
Highly-rated Southampton striker Kenwyne Jones found the back of the net after 37 minutes at Norwich but his efforts were not enough to prevent defeat for Saints. It took Jamie Cureton 61 minutes to cancel out Jones' goal and when he struck again 10 minutes later it was enough to ensure the win.
Ipswich scored after two minutes at Plymouth and were five minutes from closing out the game when the hosts equalised.
Fabian Wilnis was dismissed after 72 minutes as they tried to defend Alan Lee's opener and the inevitable came when Sylvan Ebanks-Blake scored from the penalty spot after 85 minutes following a David Wright foul.
Elsewhere, goals from Andrew Morrell (52) and Scott Murray (75) saw Blackpool and Bristol City draw 1-1. end