The idle speed of Chang 'an Star 2 is unstable.
1. Check the carbon canister and solenoid valve.
2. The computer calls the fault code to check the engine control unit, engine data flow, fuel adjustment value and oxygen sensor value. Data of main sensors such as the absolute pressure sensor of intake manifold and the throttle position sensor (TPS). Check the exhaust manifold and three-way catalyst. The engine voltage is high and the spark plug is normal, which basically eliminates the possibility of ignition system failure. If the air intake, exhaust and ignition are normal, you can check the crankshaft pulley again. It is very possible to estimate the oil circuit problem. Test the oil pressure, pressure maintaining state and fuel injection pulse width of the fuel system. Really not, replace the oil pump assembly and carbon canister.
3. Nozzle cleaning and throttle body cleaning.
4. Idle motor. 4S generally has equipment to detect motor idling. Generally, if there is no problem when the motor is started, the vibration will be very slight, and it will move up and down when the oil is supplied or loosened.
Extended data:
Performance characteristics of Chang 'an Star:
1. Performance advantages
Changan Star is fashionable in appearance, keeping up with the international trend, adopting multi-point injection JL474Q engine, saving energy and protecting the environment, and the emission reaches the Euro II standard. Side door anti-collision bar, anti-collision and energy absorption design, better safety performance; Double steam air conditioner has better refrigeration effect.
2. Safety device
The front of Chang 'an Star protrudes forward and has a collision buffer frame, which reduces the damage to drivers caused by collision and ensures driving safety. The front wheel is in front to reduce the impact of frontal collision; The front door is equipped with an anti-collision bar to effectively resist side impact; Double-loop hydraulic braking system, vacuum booster, front disc and rear drum braking make braking more reliable; Equipped with steering anti-theft lock, which makes parking and locking easier and reduces the psychological burden when driving; Auxiliary safety device for rocker of middle door and window.
3. Comfort equipment
Changan Star's front seats can slide back and forth, and the backrest angle can be adjusted, which is suitable for drivers of different sizes and heights to operate cars. The backrest angle of the middle row seat can be adjusted to increase the ride comfort; The rear seat can be folded, which increases the loading space and is convenient for transporting large luggage; The engine adopts full floating support technology to effectively block the noise and vibration from the muffler; Brand-new fluorine-free automobile air conditioner, double evaporators, strong refrigeration capacity, conducive to environmental protection; 8 inch vacuum booster, braking is more labor-saving and effective.
4. Internal and external equipment
Front and rear bumper decorative assembly, stylish and safe appearance; Install spoiler and body side guard; The instrument bedplate is made of PP material, which is acid and alkali resistant, high temperature resistant and delicate to the touch. An interval odometer is added to the odometer, which is convenient for recording interval mileage; Adopt an air filter that automatically adjusts the intake temperature to improve the performance and fuel consumption of the engine; Fully enclosed oil tank, built-in electronic oil pump, reduce oil pump noise and increase oil supply.
References:
Baidu Encyclopedia: Chang 'an Star