What are the symptoms of a faulty engine solenoid valve?
2 Answers
When the engine solenoid valve is faulty, the following symptoms may occur: unstable engine idle; jerking when shifting gears; engine prone to stalling; abnormal increase in fuel consumption. In severe cases, there may be issues such as incorrect mixture concentration, excessive oil vapor in the engine, and weak ignition. Automotive Solenoid Valve: Automotive solenoid valves are actuators in the electronic control system. They can be categorized by function into shift solenoid valves, lock-up solenoid valves, and pressure-regulating solenoid valves, and by operation mode into on-off solenoid valves and pulse-width modulated solenoid valves. Solenoid Valve Trouble Codes: First, read the trouble codes by connecting a diagnostic tool to access the automatic transmission control unit and query the stored trouble codes. If a sensor signal loss that prevents the automatic transmission control unit from identifying shift timing occurs, or if a shift solenoid valve stores a trouble code, the automatic transmission will enter a fail-safe mode.
I've been driving for over a decade and have experienced a faulty engine solenoid valve. The most obvious symptoms were severe engine shaking, lack of power during acceleration, and a significant drop in performance. The idle was particularly unstable, often stalling, and fuel consumption increased sharply—from 8 liters per 100 kilometers to over 10 liters after the issue arose. The engine warning light also frequently came on, signaling a problem. The key concern was the major safety hazard; I once had this happen on the highway, where the car suddenly slowed down, nearly causing a rear-end collision. Later, the mechanic explained that the solenoid valve controls valve timing or fuel flow, and when it fails, it causes uneven air-fuel mixture. He recommended regular maintenance to clean carbon deposits and extend its lifespan, advising not to wait until a breakdown occurs on the road, like I did, to regret it.
