Oil-Fouled Spark Plugs Causes, Effects, and Solutions

Oil can deteriorate sparkplug leads and the boot that goes over the insulator of the sparkplug. This can result in missfires. This is a fairly common problem due to a bad spark plug tube seal. Remove the valve cover and replace the valve cover gasket and spark plug tube ... Sounds like the spark plug tube seals are leaking. Not something that's going to cause catastrophic failure, but it may cause misfires if too ... It seems to be a common issue and many find the seals are fine and that it is a oil fuel mix that works it's way up the plug threads over time. The spark plug being wet with oil could be from three things. 1. worn rings. 2. hardened valve guide seals. 3. stuck rings on that cylinder ( ... Put a rag over the spark plug hole. Using a long-nozzle blow gun and blow out as much oil as possible. Spray in some brake clean. Repeat. If there is any question, the spark plug tube seal is offered by GM - Part Number 12607600. "Window shopping" for a Silverado isn't all that bad ... If it's above the threads, then it's probably a leaky valve cover gasket. If it's within the cylinder then you should check the compression on ... Check to see if you have any oil residue in the plugg tube, and if you do, you have to replace spark plug tube seals, it it involves pulling off ... The most common oil on spark plugs symptoms can include the following ... 1. Blue smoke form exhaust ... 2. Reduced fuel economy ... 3. Reduced engine ...