Lap 400 -- CHECKERED FLAG: Jimmie Johnson wins the Autism Speaks 400, his fourth victory at Dover and second of 2009.

Lap 399 -- WHITE FLAG: Jimmie Johnson leads Tony Stewart.

Lap 398 -- LEAD CHANGE: Jimmie Johnson makes the move work, passing Tony Stewart for the lead.

Lap 397 -- Nose-to-tail with Tony Stewart leading Jimmie Johnson.

Lap 395 -- Jimmie Johnson tries again below Tony Stewart, but Stewart holds.

Lap 394 -- Jimmie Johnson pulls below Tony Stewart, but Stewart holds the lead.

Lap 392 -- Jimmie Johnson takes second from Greg Biffle and now battles Tony Stewart.

Lap 391 -- LEAD CHANGE: Tony Stewart leads by passing Greg Biffle on the bottom. Biffle tries the crossover but can't stick it.

Lap 390 -- With 10 to go, Tony Stewart is on the bumper of Greg Biffle. Matt Kenseth and Kurt Busch battle hard for fourth.

Lap 386 -- With 14 laps to go, Greg Biffle and Tony Stewart are within a few car-lengths. Jimmie Johnson is playing with his line trying to catch the leaders.

Lap 384 -- Jimmie Johnson moves around all lapped traffic as the top three cars are in line.

Lap 380 -- Jimmie Johnson passes Kurt Busch for third place. Greg Biffle and Tony Stewart are ahead of him.

Lap 378 -- Jimmie Johnson moves around Kasey Kahne for fourth place.

Lap 377 -- Kurt Busch passes Kasey Kahne for third place. Busch took four tires on his last pit stop to Kahne's two.

Lap 375 -- Jimmie Johnson is mired in eighth position after a pit malfunction and four tires on the last stop.

Lap 373 -- GREEN FLAG: Greg Biffle gets the race going again.
1. Greg Biffle
2. Tony Stewart
3. Ryan Newman
4. Kasey Kahne
5. Kurt Busch

Lap 371 -- David Reutimann and David Stremme are on pit road to repair any damage. There's minimal damage to Reutimann's car. Kyle Busch also pits for tires and some changes.

Lap 370 -- YELLOW FLAG NO. 10: David Stremme slams the wall coming off Turn 4. Stremme was sixth and got clipped by Mark Martin, sending him across the pack and into the inside wall, then up the race track. David Reutimann spun to avoid hitting Stremme.

Lap 369 -- GREEN FLAG: Greg Biffle leads the field to green. Fourth place was the first car to take four tires.
1. Greg Biffle
2. Tony Stewart
3. Ryan Newman
4. Kasey Kahne
5. Kurt Busch

Lap 366 -- Greg Biffle maintains the lead by being the first off pit road.

Lap 365 -- LEAD CHANGE: Greg Biffle is credited with the lead due to his pit stall location.

Lap 364 -- Leaders head to pit road:
• Jimmie Johnson gets a chassis adjustment and four tires
• Mark Martin gets no adjustments despite being tight
• Kurt Busch asks for no adjustments, only water
• Greg Biffle tells his crew to take only two tires
• Tony Stewart, Ryan Newman and Kasey Kahne take two tires

Lap 363 -- YELLOW FLAG NO. 9: Debris is in Turn 3.

Lap 355 -- Jimmie Johnson's lead on Kurt Busch is 1.548 seconds.

Lap 351 -- Kurt Busch runs second and asks his crew if he should "go get" leader Jimmie Johnson. The crew's response: "Go get him."

Lap 347 -- Kyle Busch still reports an issue with his car, although the vibration is gone. The splitter is disconnected from his car near the middle of the front bumper.

Lap 344 -- Kyle Busch hits pit road with a vibration on his car. He gets right-side tires.

Lap 342 -- Kyle Busch is up to sixth position after his long battle with the handling on his car.

Lap 337 -- Kevin Harvick, David Ragan and Martin Truex Jr. go three-wide in a battle for 21st spot, the first car one lap down.

Lap 336 -- Kurt Busch moves into second spot by passing Greg Biffle.

Lap 335 -- GREEN FLAG: Jimmie Johnson gets the race going again.
1. Jimmie Johnson
2. Greg Biffle
3. Kurt Busch
4. Mark Martin
5. Matt Kenseth

Lap 333 -- LEAD CHANGE: Jimmie Johnson gets the lead by being the first car off pit road.

Lap 332 -- LEAD CHANGE: Greg Biffle is credited with the lead due to his pit stall location.

Lap 331 -- Leaders head down pit road:
• Jimmie Johnson gets minor changes and four tires
• Mark Martin gets a track-bar adjustment and four tires
• Greg Biffle gets no chassis changes on his stop
• Kyle Busch asks for air-pressure changes
• Tony Stewart has a fast stop and picks up three spots

Lap 330 -- YELLOW FLAG NO. 8: Debris is on the track.

Lap 329 -- Greg Biffle passes Kurt Busch to take third.

Lap 323 -- Kurt Busch and Greg Biffle both drive by Matt Kenseth for third and fourth, respectively.

Lap 321 -- Mark Martin drives below Matt Kenseth for second place. Kenseth continues to battle a loose car.

Lap 320 -- Joey Logano has had a solid day and maintains 15th position.

Lap 315 -- Tony Stewart moves around Reed Sorenson to take 10th place.

Lap 310 -- Reed Sorenson continues his solid day by running in 10th.

Lap 305 -- Matt Kenseth tells his crew the car is way too loose. He still runs second, but he's 2.355 seconds back of leader Jimmie Johnson.

Lap 300 -- Greg Biffle, Carl Edwards and Kyle Busch race hard for fifth position. Biffle takes the spot, followed by Busch.

Lap 295 -- Tony Stewart is still looking to get his car tighter. He now runs in 11th after the changes the team made.

Lap 291 -- GREEN FLAG: Jimmie Johnson leads the field to green.
1. Jimmie Johnson
2. Matt Kenseth
3. Mark Martin
4. Kurt Busch
5. Carl Edwards

Lap 287 -- Few takers on pit road, but Dale Earnhardt Jr. is among those pitting for four tires and more adjustments. Others who pit include Juan Montoya, Jamie McMurray and David Reutimann.

Lap 286 -- YELLOW FLAG NO. 7: Robby Gordon and Paul Menard crash coming off Turn 2. David Stremme got loose coming off the turn, and Gordon and Menard crashed. Gordon went directly into the inside wall.

Lap 285 -- LEAD CHANGE: Jimmie Johnson drives below Matt Kenseth to lead.

Lap 284 -- Kyle Busch takes seventh place from Dale Earnhardt Jr.

Lap 281 -- GREEN FLAG: Matt Kenseth leads the field to green.
1. Matt Kenseth
2. Jimmie Johnson
3. Mark Martin
4. Kurt Busch
5. Carl Edwards

Lap 279 -- LEAD CHANGE: Matt Kenseth is the new leader by being first off pit road.

Lap 278 -- LEAD CHANGE: Carl Edwards leads due to his pit stall position.

Lap 277 -- Leaders head down pit road:
• Jimmie Johnson gets a track-bar adjustment on his loose car
• Matt Kenseth wants grip and gets some changes
• Greg Biffle gets four tires and fuel in a smooth stop
• Carl Edwards is loose and asks for changes

Lap 276 -- YELLOW FLAG NO. 6: Debris is on the frontstretch.

Lap 274 -- Dale Earnhardt Jr.'s car continues to be tight. He drops to seventh after being passed by Greg Biffle.

Lap 270 -- Jimmie Johnson is having voltage issues. He still leads by 3.244 seconds.

Lap 265 -- Tony Stewart has fallen back to 13th position with his ill-handling car.

Lap 260 -- Kasey Kahne moves back into the top 10 when he passes Tony Stewart.

Lap 256 -- Tony Stewart drops two positions and now runs in ninth. The changes his crew made resulted in a drastic loss in grip.

Lap 254 -- Michael Waltrip is on pit road with a possible engine issue.

Lap 250 -- Matt Kenseth is now in second position with sights set on leader Jimmie Johnson.

Lap 247 -- Matt Kenseth moves around Dale Earnhardt Jr. for third place. Earnhardt says this combination has resulted in a tight race car.

Lap 245 -- Kurt Busch moves into fifth position.

Lap 241 -- LEAD CHANGE: Jimmie Johnson takes the lead back from his teammate, Mark Martin.

Lap 240 -- LEAD CHANGE: Mark Martin takes the lead when Jimmie Johnson floats to the top of the track.

Lap 237 -- GREEN FLAG: Jimmie Johnson leads the field to green.
1. Jimmie Johnson
2. Mark Martin
3. Dale Earnhardt Jr.
4. Matt Kenseth
5. Kyle Busch

Lap 234 -- LEAD CHANGE: Jimmie Johnson gets the lead back by being the first car off pit road.

Lap 233 -- LEAD CHANGE: Carl Edwards is credited with the lead due to his pit stall location.

Lap 232 -- Leaders head to pit road:
• Jimmie Johnson gets a chassis adjustment and tires
• No adjustments for Mark Martin, just tires
• Dale Earnhardt Jr. gets adjustments to make him a little loose
• Carl Edwards asks for minor adjustments to his car but has a slow stop

Lap 231 -- YELLOW FLAG NO. 5: Second-place Denny Hamlin blows a right-front tire, sending him hard into the Turn 4 wall. He has major damage.

Lap 230 -- Casey Mears is running in 13th and having a solid, consistent day.

Lap 225 -- Matt Kenseth has the fastest car this lap while running in sixth.

Lap 222 -- David Stremme is having a solid day running in 12th position.

Lap 216 -- Juan Montoya pits for tires. Jimmie Johnson finally puts Jeff Gordon two laps down. He caught Gordon six laps ago but did not pass him until now. Gordon lost his first lap during the caution on Lap 117.

Lap 215 -- Second-place Denny Hamlin is battling a loose race car, but he has managed to cut Jimmie Johnson's lead to 3.416 seconds.

Lap 210 -- There are 24 cars on the lead lap. David Ragan is 24th. Martin Truex Jr. is the first car one lap down in 25th.

Lap 200 -- At the halfway point, Jimmie Johnson leads Denny Hamlin by 6.233 seconds.

Lap 195 -- Kyle Busch has fallen to 16th position with his ill-handling car.

Lap 190 -- Reed Sorenson is hanging on in eighth position with his strong run. He fell back during an early pit cycle, but the Lap 117 caution got him back near the front.

Lap 185 -- Jeff Burton has the fastest car this lap in 11th position.

Lap 179 -- Kyle Busch's crew may have over-adjusted the car. He complains that he has no air pressure on the right side.

Lap 174 -- Kyle Busch drops to sixth place when Mark Martin and Dale Earnhardt Jr. pass him. He's fighting a loose car.

Lap 170 -- GREEN FLAG: Jimmie Johnson leads the field to green.
1. Jimmie Johnson
2. Denny Hamlin
3. Carl Edwards
4. Kyle Busch
5. Mark Martin

Lap 167 -- LEAD CHANGE: Jimmie Johnson gets the lead back as the first car off pit road.

Lap 166 -- LEAD CHANGE: Carl Edwards is credited for leading the lap due to his pit box position.

Lap 165 -- Leaders head down pit road:
• Jimmie Johnson is loose and gets minor adjustments
• Tony Stewart asks for a chassis adjustment with a slow stop
• Mark Martin gets a track-bar adjustment and tires
• Carl Edwards gets a chassis adjustment
• David Reutimann gets the free pass

Lap 164 -- YELLOW FLAG NO. 4: Juan Montoya blows a right-front tire on the straightaway and spreads debris on the track.

Lap 160 -- Matt Kenseth runs in eighth position. He was on pit road when the previous caution came but did not pit.

Lap 155 -- Tony Stewart drives to the outside of Kyle Busch to take fourth position.

Lap 150 -- Leader Jimmie Johnson is trying to catch Kurt Busch to put him a lap down in 23rd position.

Lap 145 -- Mark Martin continues to run in third place. He is trying to overcome a an early-race pit miscue that buried him in the field.

Lap 140 -- Dale Earnhardt Jr. is up to seventh position after using pit strategy to stay on the lead lap.

Lap 135 -- Greg Biffle has the fastest car on the track this lap from his 21st running position.

Lap 130 -- LEAD CHANGE: Jimmie Johnson takes the lead as the two cars try to put Jamie McMurray a lap down.

Lap 127 -- LEAD CHANGE: Carl Edwards drives below Jimmie Johnson for the top spot.

Lap 124 -- GREEN FLAG: Jimmie Johnson gets the race going again with just 26 cars on the lead lap. The tail-end of the lead lap cars will start ahead of Johnson.
1. Jimmie Johnson
2. Carl Edwards
3. Mark Martin
4. Kyle Busch
5. Tony Stewart

Lap 121 -- LEAD CHANGE: Jimmie Johnson inherits the lead after pit stops.

Lap 120 -- Cars hit pit road:
• Tony Stewart gets a chassis adjustment and tires
• Mark Martin gets a chassis adjustment for his ill-handling car
• Carl Edwards gets an air-pressure adjustment during his stop

Lap 119 -- Pit road is closed.

Lap 117 -- YELLOW FLAG NO. 3: Debris in Turn 2 from John Andretti's slap on the wall. Several cars get trapped one lap down. Matt Kenseth is on pit road but does not pit once the caution flag flies. Jeff Gordon is also on pit road and takes right-sides only when the caution comes out, an adjustment made due to the flag.

Lap 116 -- LEAD CHANGE: Carl Edwards takes the lead after Jimmie Johnson pits.

Lap 116 -- Greg Biffle and Martin Truex Jr. pit. Truex gets four tires and fuel with minor changes. Biffle gets changes also. Jimmie Johnson pits for a track-bar adjustment.

Lap 114 -- Bobby Labonte returns to pit road for a penalty. He was caught speeding.

Lap 112 -- Sam Hornish Jr. makes his pit stop. Juan Montoya pits with him for four tires and fuel on a loose race car.

Lap 111 -- Kurt Busch pits eight laps earlier than he planned. He tells his crew something went wrong and he has a cut tire. He gets four tires and fuel and the crew adds a spring rubber. Bobby Labonte pits as well.

Lap 109 -- David Reutimann makes his pit stop and asks for more grip and an air-pressure adjustment. Jamie McMurray makes his stop.

Lap 107 -- Kasey Kahne heads to pit road for a scheduled stop.

Lap 102 -- Kasey Kahne moves around David Reutimann to take third place.

Lap 100 -- Michael Waltrip makes a pit stop earlier than had been scheduled. Mike Bliss takes his car to the garage.

Lap 99 -- Clint Bowyer is slowly climbing through the field, running in ninth position.

Lap 95 -- David Reutimann has the fastest car on the track while running in third place. The two leaders are working through slow traffic.

Lap 88 -- Carl Edwards catches and passes Martin Truex Jr. to take sixth.

Lap 85 -- Martin Truex Jr. is running strong from his sixth position, but Carl Edwards is chasing.

Lap 80 -- Greg Biffle has the fastest car on the track this lap from his second position.

Lap 75 -- Kurt Busch has settled into the fifth position. He turned his brake blower off, but his crew tells him to turn it back on with the demand this track has on brakes.

Lap 69 -- Jamie McMurray is holding on to 10th with a good run. He started 18th.

Lap 64 -- Sam Hornish Jr. is going strong early. He runs in ninth after his 12th-place start.

Lap 58 -- Kyle Busch is going backward. He restarted fifth but has fallen back to 12th.

Lap 54 -- David Reutimann moves around Kurt Busch to take third position.

Lap 52 -- Mike Skinner takes his car to the garage.

Lap 50 -- LEAD CHANGE: Jimmie Johnson beats Greg Biffle by a nose back to the line and takes the top spot.

Lap 49 -- GREEN FLAG: Greg Biffle gets the race back under way.
1. Greg Biffle
2. Jimmie Johnson
3. David Reutimann
4. Kurt Busch
5. Kyle Busch

Lap 46 -- Mark Martin makes another pit stop.

Lap 45 -- Cars in the back make pit stops. The top 15 cars stay out.

Lap 44 -- YELLOW FLAG NO. 2: Tony Raines blows a right-front tire, spraying debris on the track.

Lap 43 -- Dave Blaney takes his car to the garage.

Lap 41 -- David Gilliland takes his car to the garage.

Lap 39 -- Jimmie Johnson battles for the lead and goes side-by-side below Greg Biffle.

Lap 36 -- LEAD CHANGE: Greg Biffle goes around Elliott Sadler to take the lead. Jimmie Johnson follows.

Lap 35 -- GREEN FLAG: Elliott Sadler leads the field to green.
1. Elliott Sadler
2. Greg Biffle
3. Jimmie Johnson
4. David Reutimann
5. Reed Sorenson

Lap 34 -- LEAD CHANGE: The top three cars pit, handing the lead to Elliott Sadler.

Lap 33 -- LEAD CHANGE: David Gilliland becomes the leader by staying out. Joe Nemechek and Dave Blaney also stay on track.

Lap 32 -- Cars head down pit road:
• Jimmie Johnson gets a chassis adjustment for a loose car
• Greg Biffle is tight and asks for adjustments and tires
• Reed Sorenson is tight in the center and loose off as he gets tires
• Elliott Sadler gets two tires and gains 17 spots to get out first

Lap 31 -- YELLOW FLAG NO. 1: The competition caution is out. NASCAR wants teams to examine tire wear due to an overnight shower that washed rubber off the track.

Lap 29 -- LEAD CHANGE: Reed Sorenson takes the lead in a three-wide battle for the top spot. Sorenson shot below David Reutimann, and Greg Biffle went below Sorenson. Biffle held the spot on the backstretch, but Sorenson made the pass.

Lap 27 -- After leading early, Juan Montoya has fallen back to 11th position and is struggling with the car's handle.

Lap 24 -- Reed Sorenson has closed to within a car-length of leader David Reutimann.

Lap 20 -- Greg Biffle is on the move and up to third position after passing Kyle Busch. He started fifth and dropped to ninth before making his move.

Lap 13 -- Kasey Kahne had dropped to eighth position, getting passed by Carl Edwards. Kahne started the race in second position.

Lap 11 -- Reed Sorenson is strong early, hanging in second position behind leader David Reutimann.

Lap 6 -- LEAD CHANGE: David Reutimann goes back around Juan Montoya to take the lead.

Lap 3 -- LEAD CHANGE: Juan Montoya shoots around David Reutimann on the outside to take the lead.

Lap 1 -- David Reutimann leads the first lap as cars spread out behind him in a battle for second.

2:17 p.m. -- GREEN FLAG: David Reutimann gets the Autism Speaks 400 under way from Dover International Speedway.

2:13 p.m. -- Cars roll onto the concrete racing surface.

2:08 p.m. -- Larry Oliveri, grand marshal, delivers the command on behalf of all people touched by autism: "Gentlemen, start your engines!"

2:01 p.m. -- Sarah Darling sings the national anthem.

2 p.m. -- Rev. Dan Schafer delivers the invocation.

1:33 p.m. -- NASCAR will hold a competition caution on Lap 30 as teams keep an eye on tire wear.

1:30 p.m. ET -- FOX's pre-race coverage of the Autism Speaks 400 at Dover International Speedway is under way.