What is the normal idle speed for the Hongqi H5?
4 Answers
Here is an introduction about car idle speed: 1. Idle speed is an operating condition of a car, referring to the engine running in neutral gear. The engine speed during idle is called idle speed, which can be adjusted by changing the throttle opening size, etc. 2. Idle speed means the engine is "working without output." It refers to the engine running without load, only overcoming the internal friction resistance of its components, without outputting power externally. 3. The minimum speed required to maintain stable engine operation is called idle speed, which is one of the five basic operating conditions of an engine. For an engine with good performance, the idle speed is generally between 550-800 RPM. 4. Idle speed can be adjusted by changing the throttle opening size, idle fuel supply, etc. Generally, the optimal idle speed is the lowest speed within the idle range where the engine does not shake and has good acceleration performance.
Driving the Hongqi H5 for these two years, I've become quite familiar with its temperament. It's quite common for the RPM to surge to just over 1000 during a cold start, and it drops back to around 800 RPM half a minute after the engine warms up. Once in winter, with temperatures at minus ten degrees Celsius, the tachometer even hit 1200 RPM at startup, which gave me a bit of a scare. Later, I asked the 4S店 technician, who said it's normal when the engine oil hasn't fully warmed up. Now, I've paid extra attention at red lights—when the AC is on or the steering wheel is turned to full lock, the RPM slightly rises to 900. The technician explained this as the electronic system automatically compensating with extra fuel. As long as the RPM doesn't consistently exceed 1000 or the tachometer fluctuates wildly like a pendulum, there's no need to worry too much.
From a mechanical perspective, the electronic throttle of the Hongqi H5 adjusts the air intake in real time. Under normal operating temperature, the target idle speed controlled by the ECU is maintained between 750-850 RPM. During my last OBD scanner reading, I observed a momentary 50 RPM compensation when the headlights were turned on. For China-6 emission standard models, special attention should be paid - the RPM actively rises to 1000 during particulate filter regeneration, accompanied by noticeable exhaust pipe roaring. Additionally, for vehicles predominantly used for short trips, regular highway driving is recommended to clear carbon deposits. My neighbor, who exclusively drove three-kilometer distances, eventually developed cold-start idle shaking resembling asthmatic symptoms.
Compared to the Passat and Accord I've driven, the Hongqi H5 has a more aggressive idle logic. When I first got the new car, I specifically tested it: with the AC on in summer, the idle speed was 880 rpm, and it immediately dropped to 810 rpm when the AC was turned off. With the ignition on but the engine not started, the voltage was 12.3V, and after starting, the voltmeter jumped to 14.1V at idle, indicating the alternator was charging. The most noticeable thing was in winter when remote starting, the RPM could stay at 1100 for a full three minutes. The 4S technician said this was a specially tuned fast warm-up program, about 200 rpm higher than other models, but it would return to the normal range once the coolant temperature gauge reached the midpoint.
