I bought this car three months ago and drove it for a long trip (around 5,000 miles) without any issues. But these days, I found P0305 (cylinder five misfired). After I changed the ignition coil and spark plugs, the code P0305 is still showing and the worse thing is that there are white smoke and bad smell under the hook after running. In addition, there is oil leaking at the two valve cover bolts beside the cylinder five.
The mechanic checked the spark plugs and found that both of them are in very good shape without oil leaking at them. He then checked the engine compression for both cylinder four, five, and six and found that only cylinder five has a very low compression (only below 90 while other two are around 150). He told me that there are some serious internal problems in the cylinder five and it needs to be rebuilt which will cost tons of money.
I can tell that the previous owner is very honest and this car had no big trouble before except a little bit oil burning. I have checked the engine following your article (it is really professional and thanks for sharing so much), I think that it may not be caused by the blown head gasket since cylinder four and six are good and there are no signals that the coolant system has problems.
I could not afford $3,000.00 to rebuild the engine. Could you help to give me some suggestion? Will oil leak at valve cover bolts beside the cylinder five cause P0305 for my car? Must I open the valve cover to stop the oil leaking at valve cover bolts? Once I open the valve cover, must I change the valve gasket? Any other ideas?
Thanks a lot.
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Monday, October 9th, 2017 AT 2:17 AM