What are the effects of a faulty one-way valve in the valve cover?

1 Answers
OZoe
07/29/25 9:42am
If the one-way valve in the valve cover (also known as the crankcase breather valve) fails, it can affect the ignition and performance of the air-fuel mixture, thereby impacting the engine's power output. This is particularly noticeable during engine idle, low-speed operation, light loads, and when the engine is cold. The following are potential causes of engine surging: 1. High engine idle speed. 2. Improper adjustment of the throttle cable or throttle position sensor, leading to excessively high main oil pressure. 3. Delayed gear shifting. 4. Cracked or loose vacuum hose of the vacuum-type throttle valve. 5. Faulty main oil pressure regulator, causing excessively high main oil pressure. 6. Stuck damper piston, preventing proper damping. 7. Missing one-way valve steel ball, resulting in rapid engagement of shift actuators (clutch or brake). 8. Slipping shift actuators. 9. Non-functioning oil pressure solenoid valve. 10. Faulty engine control unit (ECU).
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