What are the reasons for the throttle not increasing in an EFI car?
3 Answers
Here are the specific reasons why the throttle does not increase in an EFI car: Fuel line blockage: Fuel line blockage leads to poor fuel supply, causing carbon deposits in areas such as the valves, idle motor, intake manifold, combustion chamber, and spark plugs. Rail pressure too low: Injector pressure relief rail pressure is too low or the common rail pressure limiting valve pressure relief rail pressure is too low, resulting in insufficient fuel supply. Incorrect air-fuel ratio: Incorrect air-fuel ratio: When the air-fuel ratio is incorrect, the car may experience unstable idling and a feeling of running out of fuel. This situation is easy to resolve. Simply adjust the idle screw until the idle stabilizes. Carburetor blockage: Carburetor blockage: If the idle measurement hole is blocked, there will be no idle; if the main metering hole is blocked, it indicates that high-speed acceleration is not smooth.
As a car enthusiast, I often help friends fix such issues. The most common reason for an electronic fuel injection car's throttle not responding is sensor failure, such as inaccurate signals from the throttle position sensor, leading to insufficient fuel injection controlled by the ECU. It could also be a fuel system problem, like low fuel pump pressure or clogged fuel injectors, causing uneven gasoline supply. Aging ignition systems, such as carbon buildup on spark plugs or damaged ignition coils, can also prevent sparks from igniting. Once, my neighbor's car had a dirty mass airflow sensor, and after cleaning it, the power was restored to normal. It's best not to tinker with it yourself; just go to a repair shop to read the fault codes with a diagnostic tool—it's quicker and safer. Remember to regularly check these key components to avoid sudden issues affecting your drive.
Last time I was driving, I pressed the accelerator but the car didn't respond, which almost scared me. It turned out to be severe carbon buildup in the throttle body, inaccurate fuel regulation by the ECU, or possibly an issue with the ignition coils causing unstable sparks. Fuel line blockages are also common, like a dirty fuel filter or clogged injectors preventing fuel from entering. This is more noticeable in traffic jams, with poor acceleration. Later, I started cleaning the throttle body and replacing spark plugs regularly, and now the car is running much better. If you encounter this situation, it's recommended to check the simple components first, and if that doesn't help, consult a professional technician to ensure driving safety and avoid mishaps.
