What are the reasons for severe shaking when starting an Audi Q5?
2 Answers
Audi Q5 experiences severe shaking during startup due to the following reasons: 1. Dirty throttle body and excessive carbon buildup in fuel injectors: After driving a certain mileage, a dirty throttle body can cause improper closing or sticking of the idle speed control motor, both of which can result in excessively high engine idle speed. Carbon deposits generated during engine operation can also lead to vehicle shaking, especially during startup when the engine shakes more violently than usual, sometimes even causing failure to start on the first attempt. 2. Aging engine mounts: Vehicle shaking may sometimes be related to aging engine mounts. Engine mounts essentially serve as the vibration damping system for the engine, absorbing minor vibrations during operation. If the engine mounts malfunction, these vibrations can transmit to the steering wheel and cabin, causing shaking during idle.
I'm an experienced driver who has worked on many cars, and the severe shaking of an Audi Q5 during startup is really annoying—I've encountered it several times. The most common issue is with the ignition system, where spark plugs accumulate too much carbon buildup over time, leading to incomplete ignition and violent engine shaking. The fuel system can also be problematic—clogged or contaminated fuel injectors or insufficient fuel pump pressure can cause improper fuel injection, resulting in severe shaking during startup. Loose engine mounts are even worse, as prolonged neglect can damage other components. I remember one repair where replacing the spark plugs immediately improved the situation. I recommend regularly checking spark plugs and the fuel system, with maintenance every 20,000 km or once a year to effectively prevent issues—don't wait until the shaking becomes unbearable. Additionally, severe shaking during startup can easily affect driving safety, especially during cold starts in winter, so it's best to let the engine warm up a bit before driving.
