OCR Text |
Show Hints Given Autoist on Checking Up Spark Plug Most car owners who nre Interested In keeping their cars in good condition condi-tion know how to discover which spark plug Is not firing if the engine misses. I". ut there Is. a more effective way of doing the Job. The customary way is to disconnect each Ignition wire separately, or to short circuit each plug with a screwdriver, screw-driver, and then note how the engine runs. If the engine does not run slower when this is done to any plug it Is a foregone conclusion that the plug hasn't been firing anyway. The better way is to disconnect a few wires with the engine running fairly fast on three or four cylinders. Then attach the other wires one at a time. Kach time a wire is attached the engine should speed up. If it doesn't, the respective plug or ignition lead is at fault. |