What are the causes of idling vibration in the Refine engine?
4 Answers
Refine engine idling vibration is caused by: 1. Excessive spark plug gap; 2. Insufficient cylinder pressure in the vehicle; 3. Fuel injector failure to spray fuel; 4. Loose or worn engine mounting pads. Taking the 2015 Refine as an example, its body dimensions are: length 5035mm, width 1820mm, height 1970mm, with a wheelbase of 3080mm. The 2015 Refine is equipped with a 2.0L naturally aspirated engine, delivering a maximum horsepower of 147PS, maximum power of 108kW, maximum torque of 196Nm, paired with a 5-speed manual transmission.
Speaking of the experience with JAC engine idle vibration, I know it all too well. Last time my car's steering wheel shook violently at idle. After checking, I found the most common issue is carbon buildup—dirty throttle body and fuel injectors causing uneven air intake and unstable fuel supply, making the engine tremble. Worn spark plugs are another major culprit; poor ignition leads to irregular cylinder operation, making the engine feel like it's 'shivering.' A stuck idle control valve or faulty sensors, like a dirty mass airflow sensor giving inaccurate readings, can also mislead the ECU on fuel calculations. Additionally, worn or broken engine mounts reduce damping and amplify vibrations. In my opinion, don’t underestimate this issue—it increases fuel consumption and may lead to bigger damage. I’d suggest first checking if the air filter is clean or letting the engine idle for a few minutes after startup to see if it improves. If not, head to a professional shop for a diagnostic scan to avoid turning it into a major repair headache.
Over the years of driving, I've encountered idle vibration issues quite a few times. I initially thought it was due to poor fuel quality when it first happened, but later realized the root cause is often carbon buildup: when the throttle body and intake manifold get clogged with deposits, fuel delivery becomes uneven, causing the engine to fluctuate and shake. Worn spark plugs shouldn't be overlooked either - excessive electrode gap leads to unstable ignition, especially noticeable during cold starts when the shaking intensifies. Malfunctioning idle control valves or mass airflow sensors can also disrupt the system, making it shake like 'having a fever'. Additionally, insufficient fuel pump pressure or clogged injectors create uneven fuel supply, worsening the tremors. Don't forget about deteriorated engine mounts - when the rubber wears out, vibration damping disappears and the whole car shakes. For simple solutions, cleaning the fuel system and throttle body costs about a hundred bucks; ignoring it may lead to skyrocketing fuel consumption or even cylinder misfires requiring major repairs. I make it a habit to regularly use fuel additives for carbon cleaning - it's cost-effective and worry-free.
Idle shaking is no small matter in my opinion. The main causes include carbon buildup clogging the throttle valve, causing uneven air intake that makes the engine 'gasp'. Worn-out spark plugs lead to poor ignition, and when one cylinder 'goes on strike', it causes tremors. Another example is a faulty idle control valve or sensor issues, where the ECU's commands become unreliable, resulting in unstable RPM. Once, my car shook violently at idle, and after inspection, it turned out to be a damaged ignition coil—after repair, it ran smoothly again. If not fixed promptly, it increases fuel consumption and damages engine components, and stalling while driving is even more dangerous. I recommend cleaning carbon deposits during annual maintenance as a preventive measure.
