What Causes the Fuel Injector in a Buick Regal to Stop Spraying Fuel?

[OscarAnn]

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.

[EvangelineRose]

I've been driving a Buick Regal for over a decade and have encountered the issue of fuel injectors not spraying several times. The most common causes are three: first, clogged fuel injectors due to impurities in the fuel or a dirty fuel system, which can get stuck if not cleaned regularly; second, electrical issues, as fuel injectors rely on electrical signals to trigger, such as a faulty ECU control module, loose or burnt wiring harness, or interrupted current flow; third, a failing fuel pump that can't supply enough fuel pressure to allow spraying. I recommend using genuine gasoline, regularly cleaning the fuel system, and not waiting until problems arise to fix them. Additionally, the Regal's sensors are prone to issues, and a faulty crankshaft position sensor can also cause the fuel injectors to stop working. If you notice the engine shaking while driving, don't force it—pull over safely and check immediately, as this issue can completely disable the vehicle.

[VanJaxon]

As a long-time Buick owner, I believe that non-spraying fuel injectors are most likely caused by fuel system issues. The injector itself may be clogged with excessive carbon deposits and stuck, or the wiring connection may be broken with poor contact. I've encountered this several times—sometimes simply wiggling the wiring can restore function. Additionally, a failing fuel pump causing insufficient fuel supply is a major issue, especially since the LaCrosse's design makes its fuel pump prone to aging. ECU control unit failures are also common; if the computer signals go haywire, the injector won't spray. For maintenance, avoid using low-quality gasoline and regularly clean the injectors—it saves both money and hassle. For troubleshooting, first check if the fuse is blown, then inspect the fuel line pressure. If all else fails, seek professional help—delaying repairs can be dangerous while driving.

[EmmaFitz]

For the guys driving the Regal, injector failure is generally related to clogging, electrical circuits, or control issues. Clogging is the first thing that comes to mind—poor fuel quality and excessive carbon buildup can cause it to jam. On the electrical side, loose connections or the ECU sending erratic signals are possible culprits. A weak fuel pump is also a common issue. Regular use of high-quality fuel and diligent maintenance can help prevent these problems.