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Topic
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I recently did a compression test on my 2006 Nissan Sentra Spec-V, 2.5 L, with 134K miles. The results are around 150psi, that is actually the minimum pressure by the handbook.
The more frustrating is that I found oil on the 3 spark plug’s threads (one is dry), smells like engine oil, not gas. You can find in the attached picture, but not very clear.
The 2nd and 4th coil packs are also wet with oil.The engine oil drain plug is not sealed very well, so I can see small oil drop under engine, but not a big problem. After about 500 miles, I checked the dip stick, the engine oil is a little bit less, not much less. For me, it’s hard to say whether the oil consumption is due to drain plug, or burned by engine. At least, there is no blue smoke at tailpipe.
Any reason for this problem and how to diagnosis, please? Please help me, pros.
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Replies
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Just the valve cover gasket leaking. Has an O-Ring for each spark plug hole. If you want to correct the problem the valve cover gasket will need to be replaced. If it is not too bad you can clean them occasionally to see how bad the leaks are. Won’t really hurt the engine except perhaps foul the plug enough to cause misfire.
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