Is Oil on Spark Plugs a Serious Issue & What Causes It?
RepairSmith
AUGUST 3, 2024
Cylinder Deactivation and Variable Valve Timing Problems Several modern vehicles have variable valve timing (VVT) engines and cylinder deactivation features to improve engine performance. If the leak is minor, your vehicle will seem to run fine. Consequently, your vehicle will run rough, or you may experience engine backfire.
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