Common Symptoms of a Failing Cummins STC Oil Control Valve

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2025-06-10 08:12:06 -

The Cummins STC (Step Timing Control) oil control valve (part #3071599) is a critical component in high-pressure fuel systems, particularly in ISX engines. It regulates oil flow to the STC piston, ensuring proper timing for optimal engine performance. When this valve fails, it can lead to significant engine issues. In this blog, we’ll explore the key symptoms of a failing STC oil...

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