The spark plugs might also foul early from oil consumption, meaning there are black oil deposits on the spark plug. The oil light or the check engine light might also turn on. ![]() If the oil level falls low often but there is no sign of an oil leak, the engine is consuming the oil and expelling it out the tail pipe. If the VCM is malfunctioning, it will control cylinders in unnecessary ways for the driving conditions, such as jumping between cylinders when instead it needs all 6 cylinders firing. For example, driving up a hill requires more work from all 6 cylinders. ![]() The variable cylinder management (VCM) shuts down and reactivates cylinders inside the engine as needed.
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