What Causes the Fuel Injector in a Buick Regal to Stop Spraying Fuel?
1 Answers
There are several reasons why a fuel injector may stop spraying fuel, including insufficient fuel, a damaged fuel pump, a faulty high-pressure fuel pump, clogged fuel injectors, or leaks in the fuel line connections, all of which can prevent the injector from functioning properly. Below is a detailed explanation: 1. Definition: A fuel injector is essentially a normally closed valve (meaning the valve remains closed when no control signal is received; conversely, a normally open valve stays open without a control signal). The opening and closing of the valve are controlled by the movement of a needle valve. When the ECU sends a fuel injection command, the voltage signal generates a current through the injector's coil, creating a magnetic field that lifts the needle valve, allowing fuel to spray out through the injector nozzle. The primary advantage of fuel injection is its precise control over fuel delivery, ensuring the engine maintains the correct air-fuel ratio under all conditions. This not only keeps the engine running smoothly but also ensures that emissions comply with environmental regulations. 2. Troubleshooting: A fine needle can be used to unclog the injector, followed by thorough cleaning. If the needle valve's large flat surface does not properly contact the injector body's flat surface, or if the needle valve's cylindrical surface is significantly worn, corrective measures are needed. For poor contact between the needle valve's flat surface and the injector body, chromium oxide can be applied to a flat plate for figure-8 grinding. If the needle valve's cylindrical surface is excessively worn, the needle valve assembly should be replaced as a matched pair.
