Why does the Cruze idle shake but stops shaking when accelerating?

1 Answers
StChristian
07/29/25 6:31pm
There are many reasons for this phenomenon, such as severe carbon buildup inside the engine, ignition system issues, unstable fuel pressure, aging of internal engine components, etc. Below are the specific reasons: 1. Severe carbon buildup inside the engine: Often manifested as carbon buildup on the throttle valve, fuel injectors, spark plugs, and pistons. When this carbon buildup accumulates to a certain extent, it absorbs combustion heat and may even cause detonation or knocking. If the fuel injectors become clogged, it can lead to poor atomization, resulting in dripping and smoke, which not only increases fuel consumption but also pollutes the environment. 2. Ignition system issues: Generally caused by excessive carbon buildup on spark plugs or insufficient ignition voltage, leading to misfiring. This can result in single or multiple cylinders misfiring, causing the engine to lose power and shake. Severe shaking may cause the engine to hover between stalling and running. 3. Unstable fuel pressure: The fuel system includes components such as the fuel tank, fuel filter, fuel pump, oil-gas separator, fuel lines, and fuel gauge. If any of these components malfunction, become clogged, or leak, it can lead to unstable fuel pressure. The engine may experience intermittent power loss and shaking. Accelerating may temporarily increase fuel pressure and stop the shaking, but the underlying issue remains unresolved when not accelerating.
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