What is the reason for the unstable idle speed of N52B25BL engine

Air intake pipe failure, ignition system failure, fuel system failure and circuit failure, etc. It will cause engine idling instability, and at the same time, there may be black smoke from the exhaust pipe, poor power and shooting.

Treatment: When the engine idle speed is unstable, adjust the idle speed first. If the fault still exists after idle speed adjustment, check whether the idle speed measuring hole and idle air circulation hole are blocked. If the measuring hole is blocked, clean it with gasoline or acetone and blow it clean with compressed air. If necessary, it should be overhauled and adjusted.

When adjusting idle speed, it must be carried out under normal conditions such as normal engine temperature, proper valve clearance, normal ignition system, good pipeline seal, full throttle opening and tight throttle closing. When adjusting, first loosen the throttle opening adjustment screw to make the engine reach the lowest stable speed. Then screw in the idle speed adjusting screw with a screwdriver, and then slowly screw out the idle speed adjusting screw when the engine is about to turn off, so that the engine runs smoothly and reaches high speed. Then loosen the throttle opening adjustment screw to minimize the engine speed. Then adjust the idle adjustment screw to increase the engine speed. Repeat this process until the throttle opening is minimum and the engine runs at the lowest stable speed.

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