SearchAsk us anythingarrow rightDo air admittance valves go bad?They can go badly. They should not open up on positive pressure. You shouldn't get a sewer smell if they remain closed.Let's Get It Fixed!Our virtual experts can diagnose your issue (for free!) and resolve simple problems.Chat with a live expertChat nowCall 1 (855) 466-3948Call nowRATESHARECopy linkTwitterFacebookmagnifying glassLink copied to clipboard.SUBMIT AN ANSWERShop Recommended ProductsShop HomeX Recommended ProductsRELATED QUESTIONSDo vacuum tubes go bad?The only thing that can go wrong with a tube over time is the loss of its vacuum, but well-built tubes can hold up to 50 years, and due to the vacuum, the inner components do not really deteriorate.Do Schrader valves go bad?This said, schrader valves should not be twisted. Replacements like those of a rubber, even if they come in different sizes and configurations for higher doors, R-134 vs R-12, etc.Do pressure reducing valves fail?A pressure-reducing valve must never filter if there are no defects. It reduces the supply pressure to a lower pressure that is placed at its outlet. When it fails, it usually does not filter, but allows the output pressure to increase, decrease or flow.Do engine valves wear out?Well, there really is no fixed life span for the engine valves. Finally, theoretically, any valve will disappear if it is sufficiently pushed. It all depends on how well it is done, the difficulty in working, the maintenance of cars in general and the relationship with other parts of the engine, such as the time belt, for example.Do tight valves make noise?If the valves are adjusted to the point where the boot is NOT present on the valve train and PRELOAD (negative boot), it is where the valves do not completely settle the temperature and things must be twisted. The perfect balance is a motor moving smoothly with a minimum of noise of the valve train.