The most common causes of insufficient EGR flow are carbon build up in the EGR valve and a malfunctioning EGR valve. The EGR valve, or the exhaust gas recirculation valve, reroutes exhaust gas back into the intake manifold where it is drawn into the engine cylinders. Without proper EGR flow, a car will not pass an emissions test because insufficient flow causes a high saturation of noxious gas.Know More
The easiest way to determine what is causing insufficient EGR flow is to take the car to a mechanic. When a diagnostic test is run, certain codes indicate that the EGR valve needs to be replaced. If no codes result from the diagnostic test, check to see if there is excessive carbon build up in the valve. To fix this problem, take a speedometer cord and fray the ends. Insert the frayed ends into the valve. The ends of the cord attract and remove carbon from the valve.
Another common cause of restricted EGR flow is a blockage in the tubes leading from the EGR valve to the intake manifold. When a line is blocked, the tubing becomes distorted and enlarged. It is important to inspect the lines for cracks or breaks because this also causes insufficient EGR flow.Learn more about Car Parts & Maintenance
Oil appears in the spark plug well when there is a leaking valve cover gasket or when an O-ring weakens or loosens. Each spark plug has an O-ring that prevents oil leaks. When the O-ring breaks, oil begins to pool in the spark plug well. The valve cover gasket also causes oil leaks when it is worn out or not installed correctly. Valve cover gaskets are typically mounted on top of an engine to prevent oil from leaking onto other mechanical parts, such as the spark plugs.Full Answer >
A flush valve releases water from the toilet tank and into the bowl. The flush valve has a flapper that creates a water tight seal. This helps the toilet retain water until it is flushed.Full Answer >
The idle sensor is also called an idle control valve or an idle air control. It is normally found on the throttle body of the engine on a vehicle.Full Answer >
A fuel tank selector valve allows the driver to switch between the two fuel tanks found in many models of Ford trucks. The selector valve is connected to a switch that is found under the driver's seat or to the right of the steering wheel in most Ford models. When the switch is flipped, a signal is sent to the selector and one of the fuel tanks is closed.Full Answer >