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Some vehicles are equipped with spark plugs that enter the cylinder through the valve cover. When the spark plug is mounted this way, it needs to be sealed against the oil from the valve cover contaminating it. A spark plug tube is threaded into the cylinder head and a seal prevents oil under the valve cover from accessing the spark plug. The spark plug tube is not disturbed easily, though the seal can deteriorate and begin to leak. If oil from the valve cover enters the spark plug tube, it will cause the spark plug to misfire, contaminate the spark plug boot from the ignition coil, and rob the engine of power.
There is no recommended schedule to replace your spark plug tubes, though it is recommended to replace them whenever valve cover or cylinder head work is performed. If you have oil in your spark plug tubes or detect related symptoms, have one of our expert mechanics diagnose and replace the spark plug tubes if required.
The spark plug tubes are quite important for proper engine operation. Your safety isn’t going to be compromised unless your engine stalls in traffic, though a misfire can be annoying. Have the spark plug tubes replaced as soon as you are able to.