Heat If an engine overheats, then the metal inside the engine has to expand. If it expands enough, then eventually it will touch the gasket, putting it under serious pressure. If that pressure is enough to crack the gasket, or worse, crush the gasket, then the seal will be compromised and it will begin to leak.
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General Wear and Tear While there are things you can do to extend the life of an engine, at some point, problems will begin to arise. If proper maintenance hasn’t been enacted over the course of the car’s lifetime, then the gasket will fail much sooner. How long it lasts will depend on the driving style of the owner, but sometimes even the driver can’t do all that much.
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Vacuum Problems A vacuum leak issue is less likely to be the cause of a failing intake manifold gasket, but it does happen. The vehicle may still run, but there’ll be problems that make driving difficult, such as reduced power, engine misfires, and reduced MPG (fuel efficiency). Though it’s less likely, it can also cause the car to stall.
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