Automobile engine idling value falls below or exceeds a predetermined range, there will be stage flame, speed instability and other phenomena.
1, idle instability how to do?
Idle instability as follows: When idling, the engine shaking, speed uneven. The causes are: the amount of idle air clogging, poor idling devices work, individual cylinder spark plug spark too weak, individual valve Mifengbuyan, intake manifold leaks, too early or too late ignition timing, idle speed adjustment improper. When the engine idle speed instability, we must first adjust idle speed, idle speed adjustment after such failure does not eliminate, you should check the idle jet and idle air quantity holes are blocked, such as the amount of clogging, petrol or acetone to clean and can be used with compressed air to blow through; If the amount of holes are not blocked, the engine speed should stabilize at a certain speed, the police heard the intake manifold or carburetor, if the lower part of the liner at the leak, where there are air leaks, available fastening screws or Canada, Save gasket way to exclude. Such as idling instability phenomenon accompanied decreased engine power, the work should be further examination of the spark plug, sealing performance valve and ignition timing is correct, when necessary, repair, adjustment.
2, how to distinguish bad idling?
The engine is working properly, it should be able to operate even in the speed range 300-500r / min of. If the engine speed exceeds the minimum stable speed range, or in this speed range of the engine flameout occurs, speed instability, that is no bad idling or idling. When the idle poor, according to the characteristics of the failure will be divided into an idling-stop, idle instability and excessive idling. As the engine is started, when from low speed to high speed operation is good, but a flame immediately after releasing the accelerator pedal, or the first unstable operation and then turn off, was idling flameout fault. The engine idling is not smooth, the exhaust pipe issued a "sudden, sudden" sound, then usually idle instability failure. The engine speed is greater than a predetermined minimum stable range, and because they can not make this speed is reduced, compared with the idling too high or no idle fault.
3, how to adjust the idle?
Adjust the idle work, the engine must be carried out at normal temperature, valve clearance proper, normal ignition system, each piping sealed, fully open choke, throttle can be closed tightly and other normal conditions. When adjusting, first unscrew the throttle opening adjustment screw so that the engine reaches a minimum stable speed. Then use a screwdriver to unscrew the idle speed adjustment screw, when the engine is about to stall, and then slowly unscrew the idle speed adjustment screw, and achieve stable operation of the engine speed. Then the throttle opening adjustment screw screwed out, so that the old engine speed can be reduced to a minimum. Then adjust the idle speed adjustment screw, the engine speed is increased. This is repeated until the minimum throttle opening, engine operation at the lowest stable speed. Finally, to improve the speed and the sudden closure of the throttle, the engine does not stall still turning appropriate.
4, an idling-stop how to do?
When the engine is idling flameout, the first based on the actual situation on the idle adjustment. After adjustment, such as the fault disappears, the idle screw is properly adjusted. After adjustment, such as the fault can not disappear, it can throttle a little bigger, to keep the engine running, with cotton or paper and other tests carburetor, whether at the intake manifold gasket leak, if not leak, removable check the idling jet and idling while blowing through the oil passage, and then refitted test, this time as the fault disappears, indicating the idle jet and idle oil duct blockage. For vehicles equipped with an idling stop valve carburetor, you should also check the idle shut-off valve solenoid circuit is normal, if not normal due to the electromagnetic coil circuit caused by the idling fuel-efficient jet blocked, then deal with the idle shut-off valve for repair.
5, excessive idling how to do?
When the engine is idling too high, you should first start the engine, and then hand controls the throttle arm, the throttle is closed. So when idling normal, compared with the throttle tension spring is too soft, replace tension spring. Such as the hand throttle control closed invalid, you should check whether the throttle shaft Songkuang or closed throttle are tight, such as throttle closed lax or throttle shaft Songkuang should trim; if the throttle is normal, you should check Is there a slight leak underneath the throttle, if any should eliminate air leaks, such as no further adjustments to deal with idling, idling until the appropriate date.