What Causes Body Vibration During Rapid Acceleration in the LaCrosse?
2 Answers
It is a fuel system malfunction. Fuel System: The fuel system is responsible for fuel filling and transportation, ensuring that fuel smoothly reaches the engine to support its operation. It also collects fuel vapors, filters them, and releases them into the atmosphere. The principle of the evaporation system's adsorption and desorption is that fuel vapors are generated in the fuel tank due to changes in ambient temperature. When the vapor pressure exceeds the system's set pressure, the bidirectional valve opens, allowing the fuel vapors to enter the charcoal canister, where they are adsorbed by activated carbon. When the internal pressure is lower than the set pressure, the bidirectional valve opens, allowing outside air to enter the system through the charcoal canister to compensate. When the engine is running, the ECU detects the conditions for opening the charcoal canister purge valve, which then opens, allowing the fuel vapors to enter the engine under the negative pressure of the intake manifold and participate in combustion. Common Fuel System Faults: Fuel Supply Pressure Fault. Abnormal fuel supply pressure leads to an overly rich or lean air-fuel mixture, reducing engine performance and causing engine vibration. Fuel Injector Fault. A faulty fuel injector results in uneven fuel distribution among cylinders and poor atomization, leading to uneven power output from each cylinder and causing engine vibration.
I've encountered the issue of body shaking during rapid acceleration in the LaCrosse several times, and it's really frustrating. Most of the time, it's caused by problems in the engine's ignition system, such as worn spark plugs or faulty ignition coils, leading to unstable ignition and causing the engine to shake when pressing the accelerator. Another possible cause is insufficient fuel supply, like clogged fuel injectors or abnormal fuel pump operation, which can't keep up with the demand during rapid acceleration, making the engine shake more noticeably. I remember once when I was driving on the highway, the whole car shook during acceleration, and it turned out to be bad spark plugs. After replacing them, the car ran smoothly again. If not repaired in time, it could accelerate engine wear or even cause more serious failures, affecting safe driving. So, it's advisable to regularly check ignition components during maintenance to keep the engine running efficiently.
