take the 引擎頂 out first, try to spray a bit WD40 for lube, use something to knock it gently, and then try to screw it out. apply the force lightly and slowly first and then increase the power to take it out
Another method of removing a seized glow plug involves heat. Glow plug and cylinder head are made from two different materials, aluminum and metal. A gas torch may suffice as the parent part; the cylinder head is not too heavy. You need to heat the part around the cylinder head. Heat will expand the cylinder head to encourage it to loosen its grip on the glow plug. Then unscrew the glow plug with the wrench immediately before the part has a chance to cool down.