You may be surprÂ­ised to discover that a carbon monoxide (CO) detector really isn't a complicated piece of equipment. Housed inside a plastic chamber approximately 3 inches (7.6 centimeters) in diameter are parts that work in unison to alert a househoÂ­ld when lethal gas is detected.
This type of noise is usually caused by malfunctioning valve lifters or an exhaust manifold leak. If the noise lasts for more than a minute and completely disappears or dimishes after the engine is warm, the most likely cause is an exhaust manifold leak.
Belt misalignment and noise. A chirping noise that increases in frequency as the engine is revved up can be the result of belt vibration caused by misaligned pulleys. In fact most cases of belt noise are caused by misaligned pulleys and belts. As a misaligned serpentine belt span enters the grooves of a pulley, initial contact is made with only one side of the groove.