What Causes Engine Surging?
2 Answers
The causes of engine surging are as follows: 1. High engine idle speed. 2. Improper adjustment of the throttle cable or throttle position sensor, resulting in excessively high main oil circuit pressure. 3. Delayed upshift. 4. Cracked or loose vacuum hose of the vacuum-type throttle valve. 5. Malfunction of the main oil circuit pressure regulator valve, causing excessively high main oil circuit pressure. 6. Stuck damper piston, failing to provide damping effect. 7. Missing one-way valve steel ball, causing shift actuators (clutch or brake) to engage too quickly. 8. Slipping shift actuators. 9. Oil pressure solenoid valve not functioning. 10. Faulty ECU.
I've also experienced engine misfires, which typically manifest as sudden jerking or poor acceleration while driving. The most common causes are worn spark plugs or faulty ignition coils - these components failing to ignite properly leads to uneven combustion in the cylinders, creating irregular vibrations. Next could be fuel system issues like clogged fuel injectors or insufficient fuel pump pressure, where delayed fuel supply causes stalling or misfires. Additionally, an overly dirty air filter or intake manifold leaks creating air-fuel ratio imbalance can make the engine act up. Faulty sensors like oxygen sensors or throttle position sensors sending inaccurate data may cause incorrect ECU adjustments. More serious mechanical faults could include low compression or timing chain misalignment. I recommend first checking the simpler ignition and fuel systems, and if unresolved, promptly visit a dealership for diagnostic trouble code scanning to prevent bigger issues. Regular maintenance like replacing spark plugs and air filters every 20,000 km helps avoid such problems, since engine health directly impacts driving experience and fuel efficiency.
