The Terrible Towels were smelling and Heinz Field's crowd were on his feet, facing his defense to do another big play against Rams.
Safety Minkah Fitzpatrick came through, introducing a pass Jared Goff who again put the Rams season about to collapse.
The 17-12 Sunday defeat ended the moderately winning streab of two games and their record dropped to 5-4, leaving home to fight with Aaron Donald.
On a day that had two passages at Goff and lost, the Rams put themselves in a hard spot in the West of the NFC and in the race for a wild card playground.
Goff completed a pass of 41 out of 243 yards and was saved four times as the landing offense failed. He was briefly drawn from the game after retaining a victory.
Fitzpatrick scored back on the bubble and blown Steelers' fourth row in a row, improving their records to 5-4.
The Rams were behind 14-7 at half-time. They started the third quarter with a couple of Goff finished to take receiver Robert Woods, but the vibe changed again once Joe Haden took a backup corner.
When the Rams got the ball back, it was more in the same struggle. Secondly, Mike Hilton, Steelers' reserve, met Goff and put it on the side line. Blake Bortles came on and stopped for a first time on a keeper. Fourthly, the punishment Johnny Hekker tried to pass a pass by Trey Edmunds.
The Ramss appeared to have an aggressive rhythm later in the quarter. Todd Gurley ran strongly and Goff completed passports to Woods, and Gerald Everett and Johnny Mundt's tight ends as the Rams drove to the Steelers 'eight yard yard'.
But Gurley stopped for loss and Fitzpatrick broke a third pass down, forcing the Rams to arrange for a 30 yard Greg Zuerlein field goal.
Rams were forced to wait for their next property, but this was very positive when Ryan Switzer put the kick up and fell at the five yard line.
The Steelers inevitably asked a play action, and Donald and Linebacker Clay Matthews rushed off Rudolph for safety that pulled the Rams into within 14-12.
The Steelers, however, took eight minutes from the clock during propulsion which culminated in the goal of Chris Boswell's 34 yard field, increasing to five points and requiring the Ramsons to win.
The Rams drove to line 30 of the Steelers yard before three incomplete Goff passes. On the fourth down, Goff was taking a pass into the final zone for Josh Reynolds receiver, but Terrell Edmunds's safety broke up the play.
The Rams had a final chance of getting the ball back at 34 with 59 seconds left, but the Fitzpatrick interception would spoil any hope to come back.
Edge rusher Dante Fowler returned fumble for a home to the Rams to put forward 7-0. On the third play of the game, Maurkice Pouncey's Steelers center won the ball and sailed through Rudolph's hands. Fowler, who was coming from the left, managed to steal the ball and ran 26 yards to the final belt for the first score of the game.
Late in the first quarter, the Rams kept Steelers drive when Jalen Ramsey was asked to intervene a play by Nickell Robey-Coleman. Rudolph the Rams paid James Washington a short trip to tie the score.
The Rams appeared to have received some momentum when Robey-Coleman took the ball from Washington after a long gain of less than 2:30 on the left. However, thirdly at the Rams' '41, violation of nose combat, Javin Hargrave, Goff. The ball traveled more than 10 yards down the day before Fitzpatrick made it pick up and returned 43 yards to landscape, the second time in twenty weeks Fitzpatrick scored for the Steelers.
Zuerlein lost an attempt at a 56-yard yard goal when the expiration time went in the second quarter and the Steelers took 14-7 in half-time.