Wes Hoolahan's two-goal contribution was decisive for Norwich as 10-man Leicester squandered an early lead to remain bottom of the Championship.
Martyn Waghorn got the Foxes off to a dream start on two minutes, but Andrew Crofts levelled with a low drive.
Hoolahan converted a penalty following Michael Morrison's handball, and then fed Adam Drury for the Canaries' third.
Substitute Matty Fryatt scored a brace for Leicester either side of a 20-yard Hoolahan half-volley, only to see red.
The result leaves Foxes boss Paulo Sousa facing increasing pressure after his side, who remain rooted to the foot of the Championship table, were beaten 6-1 at Portsmouth last time out.
It looked like it might be Leicester's night when Waghorn went past four defenders to slot past Norwich keeper John Ruddy with just 80 seconds on the clock.
But half an hour later Wales international Crofts, who had already tested Leicester keeper Carl Ikeme with an impudent lob early on, latched on to a Grant Holt cutback to drill the ball in across goal.
Steve Howard had a chance for the visitors just before the break, but Hoolahan fired Norwich ahead from the spot shortly after the restart after Morrison was adjudged to have handled a Russell Martin cross.
With Norwich increasingly dominant, Hoolahan then picked out Drury, who marked his 300th league appearance by finding the bottom corner.
Fryatt threw the Foxes a lifeline three minutes later, poking in the rebound after Ruddy had pushed away a Howard shot.
The game continued to seesaw, and Hoolahan restored Norwich's two-goal edge with a cracking half-volley into the top corner on 74 minutes.
But Leicester refused to lie down and came back again to make it 4-3 when Fryatt scored a superb individual effort.
However, having bagged his first goals of the season, the visiting striker was then shown a straight red card for a goalmouth tussle with Leon Barnett.
That allowed Norwich to relax in the closing stages, with Drury inches away from adding a fifth.
Live text and stats
Tuesday, 28 September 2010
Hoolahan (pen) 53
03 Drury yellow card
22 Ward yellow card
14 Hoolahan (Smith 81)
19 Lappin yellow card
09 Holt yellow card
10 Jackson (Martin 72)
08 Oakley (Fryatt 54 red card)
11 Dyer (Gallagher 66)
19 Wellens (Abi 67)
Ref: WaltonAtt: 25,091
Attempts on target
Attempts off target
90:00+4:12 The referee blows for the end of the match.
90:00+3:39 Simon Lappin takes a outswinging corner.
90:00+0:13 Booking Booking for Grant Holt for unsporting behaviour.
88:39 A cross is delivered by Martyn Waghorn, clearance by Leon Barnett.
86:53 Shot from 18 yards by Adam Drury. Brilliant save by Carl Ikeme.
83:55 Grant Holt is ruled offside. Tom Kennedy restarts play with the free kick.
82:49 Andy King has an effort at goal from just inside the box that misses to the right of the goal.
81:35 Michael Lamey fouled by Chris Martin, the ref awards a free kick. Centre by Michael Lamey, Steve Howard takes a shot. Save
by John Ruddy.
80:58 Steven Smith produces a cross, save by Carl Ikeme.
80:01 Substitution Steven Smith comes on in place of Wesley Hoolahan.
79:15 Sent off The referee shows Matt Fryatt a red card.
77:57 Assist by Steve Howard.
77:57 GOAL - Matt Fryatt:Norwich 4 - 3 Leicester Matt Fryatt scores a goal from deep inside the penalty area to the bottom left corner of the goal. Norwich 4-3 Leicester.
77:31 Adam Drury delivers the ball, Chris Martin has a headed effort at goal from deep inside the area missing to the left of the
75:14 Shot by Paul Gallagher.
74:57 A cross is delivered by Matt Fryatt, Elliott Ward makes a clearance.
73:55 Assist on the goal came from Grant Holt.
73:55 GOAL - Wesley Hoolahan:Norwich 4 - 2 Leicester Wesley Hoolahan fires in a goal from outside the area to the top right corner of the goal. Norwich 4-2 Leicester.
73:07 The ball is crossed by Paul Gallagher.
72:29 Martyn Waghorn takes the free kick.
72:29 Booking Booking for Adam Drury for unsporting behaviour.
72:14 Adam Drury challenges Steve Howard unfairly and gives away a free kick.
71:54 Substitution Chris Martin joins the action as a substitute, replacing Simeon Jackson.
67:48 Direct free kick taken by Jack Hobbs.
67:48 Booking Booking for Elliott Ward.
67:39 Free kick awarded for a foul by Elliott Ward on Steve Howard.
67:18 Adam Drury produces a cross, Grant Holt takes a shot. Save by Carl Ikeme.
65:53 Substitution Yuki Abe on for Richie Wellens.
65:53 Substitution Lloyd Dyer goes off and Paul Gallagher comes on.
Correction - 64:53 Steve Howard provided the assist for the goal.
Correction - 64:53 GOAL - Matt Fryatt:Norwich 3 - 2 Leicester A goal is scored by Matt Fryatt from close range high into the middle of the goal. Norwich 3-2 Leicester.
64:53 Assist on the goal came from Andy King.
64:53 GOAL - Steve Howard:Norwich 3 - 2 Leicester A goal is scored by Steve Howard from close in high into the middle of the goal. Norwich 3-2 Leicester.
Correction - 63:30 Martyn Waghorn delivers the ball, Steve Howard takes a shot. John Ruddy makes a save. Short corner taken by Martyn Waghorn.
The ball is swung over by Martyn Waghorn,
63:30 The ball is crossed by Martyn Waghorn, Steve Howard takes a shot. Save by John Ruddy. Short corner taken by Martyn Waghorn
from the right by-line. Matt Oakley produces a cross,
61:46 Assist on the goal came from Wesley Hoolahan.
61:46 GOAL - Adam Drury:Norwich 3 - 1 Leicester Adam Drury gets on the score sheet with a goal from inside the six-yard box to the bottom left corner of the goal. Norwich
61:20 Inswinging corner taken by Martyn Waghorn from the right by-line, Elliott Ward manages to make a clearance.
61:10 The ball is crossed by Andy King, clearance by Leon Barnett.
59:38 The ball is sent over by Russell Martin, Shot from inside the six-yard box by Simon Lappin goes wide right of the target.
57:50 Simeon Jackson takes a shot. Save by Carl Ikeme. Inswinging corner taken from the right by-line by Simon Lappin, Elliott Ward
has a headed effort at goal from close in which goes wide right of the goal.
56:45 Simeon Jackson fouled by Michael Lamey, the ref awards a free kick. Simon Lappin crosses the ball from the free kick left-footed
from left channel.
56:06 Effort on goal by Andrew Crofts from a long way out goes over the bar.
53:41 Substitution Matt Fryatt comes on in place of Matt Oakley.
53:32 The ball is delivered by Wesley Hoolahan, Grant Holt has a headed effort at goal from close in which goes wide right of the
51:22 Russell Martin delivers the ball. Tom Kennedy handles the ball and concedes a .
51:14 The ball is sent over by Russell Martin, clearance by Tom Kennedy.
48:47 Shot from inside the area by Simon Lappin clears the bar.
47:00 Simon Lappin concedes a free kick for a foul on Martyn Waghorn. Free kick crossed left-footed by Martyn Waghorn from right
channel, save by John Ruddy.
45:24 Wesley Hoolahan takes a shot. Save by Carl Ikeme.
45:01 The referee gets the second half started.
45:00+1:04 The referee blows for half time.
44:42 Martyn Waghorn delivers the ball.
43:47 A cross is delivered by Wesley Hoolahan, save by Carl Ikeme.
41:42 Simon Lappin crosses the ball, save by Carl Ikeme.
40:59 Michael Lamey sends in a cross, Elliott Ward manages to make a clearance.
39:49 Centre by Tom Kennedy, Steve Howard takes a shot.
39:03 The ball is crossed by Tom Kennedy, clearance by Leon Barnett.
38:35 Corner taken left-footed by Martyn Waghorn to the near post, clearance made by Simon Lappin.
37:56 Free kick awarded for a foul by Andrew Crofts on Martyn Waghorn. Michael Morrison takes the direct free kick.
34:56 A cross is delivered by Simeon Jackson, Michael Lamey makes a clearance.
34:02 Free kick awarded for an unfair challenge on Steve Howard by Elliott Ward. Richie Wellens takes the direct free kick.
32:20 Tom Kennedy delivers the ball, Leon Barnett manages to make a clearance.
30:34 Grant Holt provided the assist for the goal.
30:34 GOAL - Andrew Crofts:Norwich 1 - 1 Leicester Goal scored by Andrew Crofts from inside the penalty box to the bottom left corner of the goal. Norwich 1-1 Leicester.
30:31 Grant Holt sends in a cross,
29:17 Martyn Waghorn gives away a free kick for an unfair challenge on Russell Martin. John Ruddy takes the free kick.
29:09 The ball is crossed by Martyn Waghorn, Leon Barnett manages to make a clearance.
28:23 Elliott Ward delivers the ball, Leon Barnett takes a shot. Save by Carl Ikeme.
27:30 Free kick awarded for a foul by Richie Wellens on Adam Drury. Free kick crossed right-footed by Simon Lappin from left channel,
clearance made by Jack Hobbs.
27:11 Shot by Russell Martin. Save made by Carl Ikeme.
26:51 Wesley Hoolahan crosses the ball, Simon Lappin takes a shot. Blocked by Andy King.
23:38 Direct free kick taken by Michael Morrison.
23:38 Booking Simon Lappin receives a caution.
23:22 Simon Lappin gives away a free kick for an unfair challenge on Andy King.
22:05 The ball is sent over by Grant Holt, clearance made by Michael Morrison.
20:43 Unfair challenge on Russell Martin by Tom Kennedy results in a free kick. Direct free kick taken by Russell Martin.
19:03 Andrew Crofts produces a right-footed shot from just outside the box that goes wide right of the target.
18:55 Adam Drury sends in a cross, Matt Oakley manages to make a clearance.
17:52 Free kick awarded for an unfair challenge on Korey Smith by Richie Wellens. Russell Martin takes the direct free kick.
16:14 The assistant referee flags for offside against Adam Drury. Carl Ikeme takes the free kick.
12:44 Unfair challenge on Steve Howard by Korey Smith results in a free kick. Tom Kennedy takes the free kick. Martyn Waghorn is
flagged offside by the assistant referee. Free kick taken by John Ruddy.
11:57 Shot by Andrew Crofts. Save by Carl Ikeme.
11:23 Inswinging corner taken from the right by-line by Simon Lappin, clearance by Steve Howard. Wesley Hoolahan crosses the ball,
clearance made by Jack Hobbs.
11:11 The ball is sent over by Simeon Jackson, Tom Kennedy manages to make a clearance.
10:30 Pass corner from right by-line crossed in by Martyn Waghorn, save by John Ruddy.
9:29 Shot by Martyn Waghorn from a long way out goes over the target.
8:21 Simon Lappin produces a cross, Tom Kennedy makes a clearance.
7:13 Inswinging corner taken left-footed by Simon Lappin, Andy King manages to make a clearance.
6:56 Adam Drury takes a shot. Save made by Carl Ikeme.
6:47 Centre by Simon Lappin, Tom Kennedy manages to make a clearance.
3:57 Unfair challenge on Steve Howard by Korey Smith results in a free kick. Strike comes in from Martyn Waghorn from the free
kick, John Ruddy makes a comfortable save.
3:42 Martyn Waghorn sends in a cross, save by John Ruddy.
1:17 GOAL - Martyn Waghorn:Norwich 0 - 1 Leicester Martyn Waghorn scores a goal from close range to the bottom left corner of the goal. Norwich 0-1 Leicester.
0:34 Unfair challenge on Michael Lamey by Simon Lappin results in a free kick. Free kick taken by Carl Ikeme.
0:00 The ref blows the whistle to start the match.
Live text and data provided by The Press Association.
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