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.
Resonators and mufflers: excessive rust, damage, or holes can cause excessive noise and rattles. Exhaust pipes, hangers, clamps, and brackets: excessive rust, broken bolts or worn parts can cause the parts to hang dangerously low, resulting in a hazard for the people driving behind you.