Different types of car engine, the idle rating has a different range. If the engine idling value is lower than or exceeds the prescribed range, there will be flameout, uneven speed or high speed phenomenon, these phenomena should be timely symptomatic judgment, inspection and exclusion.
Idle flameout. Baotou North Benz accessories after starting the engine, from low speed to high speed circuit has good, but when the accelerator pedal is released immediately after flameout; or first unstable operation, then flameout. This phenomenon can be identified as idle flameout fault.
Idle flameout, first according to the actual situation of the idle speed adjustment (if the cause of the fault can be directly maintained). After adjustment, if the fault disappears, is the improper adjustment of idle screw; if the fault cannot disappear after adjustment, the solar term door a little, keep the engine running, check with cotton or paper, carburetor, Baotou Benz accessories intake pipe gasket is leakage; such as leakage, detachable idle orifice are examined. And at the same time blowing idle oil pipe, and then reassembled test; if the fault disappears, illustrate the idle hole and idle oil blockage. Idling cut-off valve for a carburetor, should also check whether the normal cut-off solenoid circuit. If it is because of the coil circuit caused by abnormal idling oil saving orifice plug died, with cut-off solenoid valve repair.
Two, idle instability. The engine does not run smoothly, the exhaust pipe “process, suddenly Loo loo” sound, usually idle instability fault.
The engine stability at a certain speed, listen to whether there is leakage. Such as difficult to identify the leak site, can be in the carburetor and lower liner coated with a little oil, the oil is sucked into the place that is available at the leak elimination method of fastening screws or modified liners. The solar term door adjustment screw, increasing the engine speed, then the idle screw tighten gradually relaxed, see the speed is stable; the solar term door adjustment screw to relax a little, and slowly so that the engine speed is gradually reduced, and stable operation, the fan blades rotating evenly, can distinguish the blade profile (400rmin). If the adjustment is invalid, then from the carburetor inspection hole check oil, if the oil level is too low, should be adjusted. If the tests are in good condition, should continue to check the wiper tube into the exhaust manifold without cracks and leakage. Remove the carburetor, with compressed air blowing through the idle hole and idle air hole, such as loading complex work well, that is the amount of pore clogging.
If the idle the maintenance after failure may still no improvement in the engine, usually clearance of engine intake valve rod and catheter can also be caused by too large, has been near the engine overhaul, technical performance decrease, should remove the cylinder cover maintenance.
Three, idle too high. Engine idle speed is higher than the normal range, and can not be adjusted to reduce it, this is the case of idle high fault.
Baotou North Benz parts of engine idle speed is too high, should be parked in the flat on the ground, will choke button and push pull button hand acceleration check. By hand the solar term valve rocker valve closed, if can make envoys, the idle speed is normal, then that is the carburetor lever spring is too soft. If the solar term valve rocker is invalid, should check whether the loosening or solar term solar term door doors are closed tightly. If the throttle is normal, adjust the idle speed with the idle adjustment screw. If you can tune, indicating that the original is not good. Adjust the idle speed is invalid, should be on the carburetor inspection hole plug unloaded, keep the engine idling, if gasoline can flow from the inspection hole, that is caused by excessive oil, the fault is excluded.