Why does the Emgrand GL's RPM stay at 400 after starting?
3 Answers
The Emgrand GL's RPM staying at 400 after starting is due to spark plug issues, and it can be resolved by replacing the spark plugs. Below is more information about the Emgrand GL: 1. The Emgrand GL was officially launched on September 20, 2016, at the Hangzhou International Expo Center. As the fourth model of Geely's premium 3.0 series, the Emgrand GL filled the gap in Geely's A+ sedan market. 2. The Emgrand GL is equipped with two engines: a 1.3T and a 1.8L, paired with a Getrag 6DCT dual-clutch transmission and an Aisin 6-speed manual transmission. The 1.3T+6DCT powertrain combination offers smooth performance and excellent fuel efficiency, with a combined fuel consumption of 5.9L per 100km. The Emgrand GL can also be equipped with the GSG intelligent start-stop system, which reduces fuel consumption by 3%-5% depending on driving conditions.
Recently, my Emgrand GL also experienced a situation where the RPM stayed around 400 after starting. To be honest, I didn't pay much attention to it at first, thinking it was a normal phenomenon during cold winter starts. Everyone knows that it's fine for the RPM to be slightly low right after starting, and it should stabilize around 800 once the engine warms up. But even after driving for a while, my car's RPM remained at 400, which made me feel something was off—this might not be a minor issue. I consulted a mechanic friend, and he said common causes include excessive carbon buildup in the throttle body blocking the intake or a faulty crankshaft position sensor causing the ECU to inaccurately control idle speed. After cleaning the throttle body, I noticed some improvement. If left unchecked, it could lead to severe engine shaking or even dangerous stalling while driving. So, I recommend everyone first observe the RPM changes after the engine warms up, then check if the air filter is clean. If unsure, take it directly to a professional shop for diagnosis—don't risk driving just to save time.
The startup RPM of the Emgrand GL at 400 rpm is indeed a bit low, as the normal idle speed should be stable between 700-1000 rpm. From my understanding, this issue can stem from various sources: during cold starts, the RPM may briefly drop low, but if it consistently stays at 400, it could be due to carbon buildup in the throttle body obstructing airflow; or the idle control valve might be stuck; malfunctioning sensors like the temperature sensor can also affect the ECU's regulation. Low RPM not only makes the car feel sluggish and weak when accelerating but also easily leads to incomplete combustion and increased carbon deposits. I recommend the owner first test for a few minutes to see if the RPM rises; if it doesn't, try cleaning the air filter themselves; if that doesn't resolve the issue, take it to a repair shop for a computer scan to diagnose whether the circuit is functioning properly. Addressing the problem early can avoid more expensive engine repair costs later on.
