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Plugs rarely cause a misfire. Bad gas mileage yes. Try swapping plug wires first and see if the misfire follows the swap. If it does, you still need a tune up, plugs wires, cap, and rotor. If it doesn't, pull the plugs and do a compression test on it. If it is within specs(sorry, I don't know the numbers). Then do a tune up. Look at number six plug. Causes for the plug to misfire would be, Cracked ceramic, fouled out from oil, and in some cases the electrode is completely burnt away.
You didn't find oil in the pistons, you found oil in the spark plug tubes. This is fairly common on older engines. Over time the seals in the valve cover begin to leak around the spark plug tubes. Oil then works it's way into the tube and settles in the bottom.
There is an easy fix. Simply replace the valve cover gasket.
Yeah, kind of. The valve cover gasket needs replaced. The seals around the plugs go first because of heat. If the oil mark was near the top of the plug boot, replace the valve cover gaskets/seal. If it was near the bottom, slap in the plugs and wires.
flashing light means dont drive or u can or will cause more damage to vehicle --[the computer is registering a damage causing malfunction] can be reason oil on plugs --need to have code read to properly pinpont problem--as to oil on plugs multi reasons such as bad oil seals on valve--valve bad-bent-burnt---head damage-gasket-cracked-warped---piston-cylinder-rings etc--need to do a compression test to determine the extent of damage
The fault is due to the valve cover gasket passing oil into the spark plug wells. There are circular seals under the valve cover around each spark plug well opening. These spark plug well seals come with the valve cover gasket set.
No it isn't..the problem is caused by failed spark plug seals on the valve cover. There is a seal for each spark plug tube and the ends can get brittle and allow oil to seep into the tubes. You can get new ones at most any auto parts store and the are easy to replace. Another way for oil to get into the tubes is if the vavle cover is taken off and when it is put back on the seals aren't "worked" around the tubes. When I do it I use a very thin screwdriver and go around each sparkplug tube to make sure the lip of the seals is not caught by the tube and cut.
the diesel system on your vehicle works on a continous 'loop". Tank to engine....engine to tank. The fuel filters and the water separator are very susceptible to the diesel fuel 'clouding" , making the fuel heavier to push around the system. The 'clouding' is actually a type of wax which is normally held in suspension within the body of the fuel and thus is not a problem.
The wax starts to plug up the fuel system, and cause lots of problems. The fuel, being harder to push around the system, takes more pressure to move it. This will result in diesel leaqkage at any and all outlets to atmosphere at the pressure end.
The problem is usually resolved by adding an additive to the fuel tank, or having a water separator with a heater., There are also weap-around heating cables which can be fitted to fuel lines to aleviate the same problem. If your water separator has an automatic dump valve, you might like to check that it is functioning correctly and the water content is not freezing and providing an exit for the diesel fuel.
The oil around the plug may be a sign that the valve-cover needs a new gasket. Oil on the plugs can cause a misfire but it is important that you check everything over. The misfire could be due to defective wires, boots, coils, spark-plug/s, injector/s, and so much more. Take a look at the cars maintenance history, Maybe it is over due for a complete tune-up or oil change. The car is 11years old, how many miles are on it? How was it running before this?