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Recently, my car developed a misfire. I was experiencing a recurring P0302 trouble code, indicating the misfire was in cylinder 2. Knowing there could be multiple causes of the misfire, I approached the problem by investigating the simpler possibilities first. Starting with spark plugs. After combing through the entire ignition and fuel injection systems to no avail, I decided to run a compression test, which definitively told me that the problem was in the cylinder head itself. As the car wasn’t overheating and I was seeing no signs of oil and coolant mixing, I was left with the theory that the problem was most likely a burned exhaust valve or a worn valve guide in that cylinder. At any rate, the cylinder head needed to come off to repair it. Read More
 
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