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The impulse manifolds on the Enterprise NX-01 required checking every two hours to ensure they would not clog. Should they get clogged, it would cause the impulse engines to overload. (ENT: "Doctor's Orders")
On February 12, 2152, Trip Tucker claimed the impulse manifolds aboard the Enterprise required purging as an excuse for why he couldn't go with Captain Archer to visit the Torothan planet. In actuality, Tucker did not wish to go because he did not want to spend time in a desert. Archer ultimately convinced them to go, but Archer himself would use the required manifold purging as an excuse to return to Enterprise after learning Zobral and his men were considered terrorists. (ENT: "Desert Crossing")
Later that year, Trip Tucker detached a section of hull plating from Enterprise that a Romulan mine had clamped on to. Tucker noted that detaching this section of the hull would expose a good portion of the impulse manifold. (ENT: "Minefield")
Xindi-Insectoid vessels have narrow impulse manifolds with minimal deflector shielding. In 2154, Enterprise was able to destroy a Xindi-Insectoid scout ship with one photonic torpedo strike to its impulse manifold. (ENT: "Hatchery")
Later that year, Enterprise was able to pass through a subspace corridor after reconfiguring their impulse manifolds to prevent the corridor from destabilizing, as it had done for the crew of an Enterprise from an alternate timeline. (ENT: "E²")
Also in 2375, when the USS Enterprise-E was traveling through the Briar Patch, William T. Riker ordered full impulse. Geordi La Forge replied that the manifold couldn't handle full impulse in the Patch. (Star Trek: Insurrection)