The complaint was simple: the car shook badly every time the owner pressed the gas. The fix turned out to be one part, and when it came off the car, it came off in pieces. “The engine mount had completely cracked right in half,” the narrator says in a 65 second repair clip posted on September 7, 2026, by the TikTok account Mapp Angus (@mapp.angus).

The clip is told in the first person (“The owner told me the car shakes badly every time he hits the gas, so I got underneath to take a look”), with bold captions running word by word across the footage. The account does not name a shop, a city or the make of the car, and its caption keeps things short: “One Broken Mount Was Behind All That Shaking.” What the footage does show, frame by frame, is a full engine mount swap from the underside of a car on a lift.

The opening shots look straight up at the bottom of the engine, where a dusty aluminum mount bracket sits bolted against the block. “No wonder the engine moved so much under acceleration,” the narrator says.

The removal goes in stages. First the mounting bolts come out. Then, the narrator says, “I used an impact wrench to take off the front section of the mount,” and a gloved hand pulls a loose, broken piece of metal out from under the car. “It was clearly too damaged to hold anything in place.” The rest of the mount, still attached to the chassis, comes off after that.

On the workbench, with a tire rack in the background, the two halves sit side by side. Each carries a pink paint mark, and the break runs straight through the metal arm. “Check out this break. The metal had completely separated,” the narrator says, pushing the pieces apart with his fingers so the gap shows.

Then comes the line that turns the clip from a repair into a lesson. “This kind of failure doesn’t always come from one hard hit,” he says. “Years of vibration and repeated stress can slowly grow cracks inside the metal. Eventually, the whole mount can break apart.”

The replacement is shown next to the old one on the bench: a black mount that the narrator describes as “one solid piece,” which “looked much stronger.” Installation is filmed from below again. He sets the new mount “back in its original position,” then starts each bolt by hand. “After making sure nothing was cross threaded, I tightened everything down.”

The last part of the clip is the step many home mechanics skip. “But the impact wrench isn’t the final step,” he says. “The bolts still need to be tightened to the vehicle’s specified torque, so I finished the job with a torque wrench.” The closing frames show the black mount bolted flat against the engine, and the narrator signs off with a question to viewers: “If this were your car, how often would you check underneath it?”

How Often a Torque Wrench Needs Checking

The narrator’s last step relies on a tool that has to stay accurate. Norbar, a British torque tool manufacturer, says a hand torque wrench “should remain within the tolerances laid down by BS EN ISO 6789:2017 for at least 5,000 cycles,” the test condition in the international standard for hand torque tools. For how often to check one, Norbar’s guidance says “a period of twelve months is reasonable” for work that is not safety critical, and that a three month or even monthly check is advisable in other cases.

What to do if your car shakes when you accelerate

The symptom in this clip, shaking that shows up when you press the gas, is the detail worth bringing to a shop. Describe exactly when it happens: from a stop, under hard acceleration, when shifting into drive or reverse, or at idle.

Ask to see the part. In the video, the failure was visible as soon as the narrator got underneath, and the broken halves on the workbench are what he shows. If a part is replaced, ask for the old one back.

Before paying for the job, run your car’s 17 character VIN through the NHTSA recall lookup. The National Highway Traffic Safety Administration says the VIN is on the lower left of the windshield and on your registration card, and that the search shows unrepaired recalls from many manufacturers. NHTSA also notes it does not show recalls more than 15 years old unless the manufacturer offers longer coverage, and that VINs are added continuously, so it is worth checking regularly. If a mount or bracket on your model is under recall, the repair may be covered.